Merge branch 'master' into refactor/sidebar-height-spacing

.babelrc

@@ -2,9 +2,6 @@
   "presets": ["es2015"],
   "plugins": [
     "add-module-exports",
-    "babel-root-import",
+    "babel-root-import"
-    ["transform-react-jsx", {
-      "pragma": "JSX.createElement"
-    }]
   ]
 }

.eslintignore

@@ -18,7 +18,11 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 # IN THE SOFTWARE.
 
-# Build files
+# Files generated by build
 /build
 /material
 /site
+
+# Files generated by visual tests
+/gemini-report
+/tests/visual/data

.githooks/post-merge/npm-update.sh

@@ -25,6 +25,6 @@ CHANGED="$(git diff-tree -r --name-only --no-commit-id ORIG_HEAD HEAD)"
 
 # Perform install and prune of NPM dependencies if package.json changed
 if $(echo "$CHANGED" | grep --quiet package.json); then
-  echo "Hook[post-merge]: Updating dependencies..."
+  echo "Hook[post-merge]: Updating dependencies"
   npm install && npm prune
 fi

.githooks/pre-commit/branch.sh

@@ -22,7 +22,7 @@
 
 # Determine current branch
 BRANCH=$(git rev-parse --abbrev-ref HEAD)
-echo "Hook[pre-commit]: Checking branch..."
+echo "Hook[pre-commit]: Checking branch"
 
 # If we're on master, abort commit
 if [[ "$BRANCH" == "master" ]]; then

.githooks/pre-commit/lint.sh

@@ -46,6 +46,6 @@ FILES=$(git diff --cached --name-only --diff-filter=ACMR | \
 
 # Run the check and print indicator
 if [ "$FILES" ]; then
-  echo "Hook[pre-commit]: Running linter..."
+  echo "Hook[pre-commit]: Running linter"
   npm run lint --silent || exit 1
 fi

.gitignore

@@ -23,14 +23,19 @@
 
 # NPM-related
 /node_modules
-/npm-debug.log
+/npm-debug.log*
 
-# Build files
+# Files generated by build
 /build
 /manifest.json
 /MANIFEST
 /site
 
+# Files generated by visual tests
+/gemini-report
+/tests/visual/baseline/local
+/tests/visual/data
+
 # Distribution files
 /dist
 /mkdocs_material.egg-info

.stylelintrc

@@ -180,7 +180,6 @@
       "z-index"
     ],
     "property-no-vendor-prefix": true,
-    "root-no-standard-properties": true,
     "selector-class-pattern": "^[a-z0-9]+(-[a-z0-9]+)*(__[a-z]+)?(--[a-z]+)?$",
     "selector-descendant-combinator-no-non-space": null,
     "string-quotes": "double",

.travis.yml

@@ -23,19 +23,48 @@ sudo: false
 
 # Node.js versions
 node_js:
-  - 4
   - 5
   - 6
+  - 7
+
+# Build visual tests separately
+matrix:
+  include:
+    - node_js: 5
+      addons:
+        artifacts:
+          paths:
+            - gemini-report
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - gcc-4.8
+            - g++-4.8
+      env:
+        - CXX=g++-4.8
+      install: yarn install
+      script: yarn run test:visual:run
+
+# Limit clone depth to 5, to speed up build
+git:
+  depth: 5
 
 # Cache dependencies
 cache:
   pip: true
+  yarn: true
   directories:
     - node_modules
 
+# Install yarn as Travis doesn't support it out of the box
+before_install: npm install -g yarn
+
+# Do not install optional dependencies by default
+install: yarn install --ignore-optional
+
 # Install dependencies
-before_script:
+before_script: pip install --user -r requirements.txt
-  - pip install --user -r requirements.txt
 
 # Perform build and tests
-script: npm run build
+script: yarn run build

Gulpfile.babel.js

@@ -35,14 +35,17 @@ const config = {
     src: "src/assets",                 /* Source directory for assets */
     build: "material/assets"           /* Target directory for assets */
   },
-  lib: "lib",                          /* Libraries */
+  lib: "lib",                          /* Libraries and tasks */
+  tests: {
+    visual: "tests/visual"             /* Base directory for visual tests */
+  },
   views: {
     src: "src",                        /* Source directory for views */
     build: "material"                  /* Target directory for views */
   }
 }
 
-const args = yargs
+let args = yargs
   .default("clean",      false)        /* Clean before build */
   .default("karma",      true)         /* Karma watchdog */
   .default("lint",       true)         /* Lint sources */
@@ -52,6 +55,12 @@ const args = yargs
   .default("sourcemaps", false)        /* Create sourcemaps */
   .argv
 
+/* Only use the last value seen, so overrides are possible */
+args = Object.keys(args).reduce((result, arg) => {
+  result[arg] = [].concat(args[arg]).pop()
+  return result
+}, {})
+
 /* ----------------------------------------------------------------------------
  * Overrides and helpers
  * ------------------------------------------------------------------------- */
@@ -110,7 +119,7 @@ const load = task => {
  * Copy favicon
  */
 gulp.task("assets:images:build:ico", [
-  args.clean ? "assets:images:clean" : null
+  args.clean ? "assets:images:clean" : false
 ].filter(t => t),
   load("assets/images/build/ico"))
 
@@ -118,7 +127,7 @@ gulp.task("assets:images:build:ico", [
  * Copy and minify vector graphics
  */
 gulp.task("assets:images:build:svg", [
-  args.clean ? "assets:images:clean" : null
+  args.clean ? "assets:images:clean" : false
 ].filter(t => t),
   load("assets/images/build/svg"))
 
@@ -145,8 +154,8 @@ gulp.task("assets:images:clean",
  */
 
 gulp.task("assets:javascripts:build:application", [
-  args.clean ? "assets:javascripts:clean" : null,
+  args.clean ? "assets:javascripts:clean" : false,
-  args.lint ? "assets:javascripts:lint" : null
+  args.lint ? "assets:javascripts:lint" : false
 ].filter(t => t),
   load("assets/javascripts/build/application"))
 
@@ -155,8 +164,8 @@ gulp.task("assets:javascripts:build:application", [
  */
 gulp.task("assets:javascripts:build:modernizr", [
   "assets:stylesheets:build",
-  args.clean ? "assets:javascripts:clean" : null,
+  args.clean ? "assets:javascripts:clean" : false,
-  args.lint ? "assets:javascripts:lint" : null
+  args.lint ? "assets:javascripts:lint" : false
 ].filter(t => t),
   load("assets/javascripts/build/modernizr"))
 
@@ -188,8 +197,8 @@ gulp.task("assets:javascripts:lint",
  * Build stylesheets from SASS source
  */
 gulp.task("assets:stylesheets:build", [
-  args.clean ? "assets:stylesheets:clean" : null,
+  args.clean ? "assets:stylesheets:clean" : false,
-  args.lint ? "assets:stylesheets:lint" : null
+  args.lint ? "assets:stylesheets:lint" : false
 ].filter(t => t),
   load("assets/stylesheets/build"))
 
@@ -236,10 +245,10 @@ gulp.task("assets:clean", [
  */
 
 gulp.task("views:build", [
-  args.revision ? "assets:images:build" : null,
+  args.revision ? "assets:images:build" : false,
-  args.revision ? "assets:stylesheets:build" : null,
+  args.revision ? "assets:stylesheets:build" : false,
-  args.revision ? "assets:javascripts:build" : null,
+  args.revision ? "assets:javascripts:build" : false,
-  args.clean ? "views:clean" : null
+  args.clean ? "views:clean" : false
 ].filter(t => t),
   load("views/build"))
 
@@ -260,7 +269,7 @@ gulp.task("mkdocs:build", [
   "assets:build",
   "views:build",
   "mkdocs:clean"
-],
+].filter(t => t),
   load("mkdocs/build"))
 
 /*
@@ -276,14 +285,44 @@ gulp.task("mkdocs:serve",
   load("mkdocs/serve"))
 
 /* ----------------------------------------------------------------------------
- * Tests
+ * Visual tests
  * ------------------------------------------------------------------------- */
 
 /*
- * Start karma test runner
+ * Generate visual tests
  */
-gulp.task("tests:unit:watch",
+gulp.task("tests:visual:generate", [
-  load("tests/unit/watch"))
+  args.clean ? "tests:visual:clean" : false,
+  args.clean ? "assets:build" : false,
+  args.clean ? "views:build" : false
+].filter(t => t),
+  load("tests/visual/generate"))
+
+/*
+ * Run visual tests
+ */
+gulp.task("tests:visual:run", [
+  "tests:visual:generate"
+], load("tests/visual/run"))
+
+/*
+ * Update reference images for visual tests
+ */
+gulp.task("tests:visual:update",
+  load("tests/visual/update"))
+
+/*
+ * Clean files generated by visual tests
+ */
+gulp.task("tests:visual:clean",
+  load("tests/visual/clean"))
+
+/*
+ * Open a SauceConnect session for manual testing
+ */
+gulp.task("tests:visual:session", [
+  "tests:visual:generate"
+], load("tests/visual/session"))
 
 /* ----------------------------------------------------------------------------
  * Interface
@@ -295,7 +334,7 @@ gulp.task("tests:unit:watch",
 gulp.task("build", [
   "assets:build",
   "views:build",
-  args.mkdocs ? "mkdocs:build" : null
+  args.mkdocs ? "mkdocs:build" : false
 ].filter(f => f))
 
 /*

lib/.eslintrc

@@ -0,0 +1,6 @@
+{
+  "rules": {
+    "no-invalid-this": 0,
+    "max-params": 0
+  }
+}

lib/providers/jsx.js

@@ -21,7 +21,7 @@
  */
 
 /* ----------------------------------------------------------------------------
- * Definition
+ * Module
  * ------------------------------------------------------------------------- */
 
 export default /* JSX */ {

lib/servers/ecstatic.js

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import ecstatic from "ecstatic"
+import * as http from "http"
+
+/* ----------------------------------------------------------------------------
+ * Locals
+ * ------------------------------------------------------------------------- */
+
+/* Static file server */
+let server = null
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Start static file server
+ *
+ * @param {string} directory - Directory to serve
+ * @param {number} port - Port to listen on
+ * @param {Function} done - Resolve callback
+ */
+export const start = (directory, port, done) => {
+  server = http.createServer(ecstatic({
+    root: directory
+  }))
+
+  /* Listen and register signal handlers */
+  server.listen(port, "127.0.0.1", done)
+  for (const signal of ["SIGTERM", "SIGINT", "exit"])
+    process.on(signal, stop)
+}
+
+/**
+ * Stop static file server
+ *
+ * @param {Function} done - Resolve callback
+ */
+export const stop = done => {
+  if (server) {
+    server.close(done)
+    server = null
+  }
+}

lib/servers/sauce-connect.js

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import launcher from "sauce-connect-launcher"
+
+/* ----------------------------------------------------------------------------
+ * Locals
+ * ------------------------------------------------------------------------- */
+
+/* SauceConnect process */
+let server = null
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Open SauceConnect tunnel
+ *
+ * @param {string} id - Unique identifier
+ * @param {string} username - SauceConnect username
+ * @param {string} accesskey - SauceConnect accesskey
+ * @param {Function} done - Resolve callback
+ */
+export const start = (id, username, accesskey, done) => {
+  launcher({
+    username,
+    accessKey: accesskey,
+    tunnelIdentifier: id
+  }, (err, proc) => {
+    if (err)
+      throw new Error(err)
+    server = proc
+    done()
+  })
+
+  /* Register signal handlers */
+  for (const signal of ["SIGTERM", "SIGINT", "exit"])
+    process.on(signal, stop)
+}
+
+/**
+ * Close SauceConnect tunnel
+ *
+ * @param {Function} done - Resolve callback
+ */
+export const stop = done => {
+  if (server) {
+    server.close(done)
+    server = null
+  }
+}

lib/servers/selenium.js

@@ -33,19 +33,33 @@ let server = null
  * Definition
  * ------------------------------------------------------------------------- */
 
+/**
+ * Start Selenium
+ *
+ * @param {Function} done - Resolve callback
+ */
 export const start = done => {
   selenium.start({}, (err, proc) => {
+
+    /* Register signal handlers */
+    for (const signal of ["SIGTERM", "SIGINT", "exit"])
+      process.on(signal, stop)
     if (err) {
 
       /* Install selenium, if not present */
       if (/^Missing(.*)chromedriver$/.test(err.message)) {
-        selenium.install(done)
+        new Promise(resolve => {
-
+          selenium.install({}, resolve)
-        /* Start selenium again */
-        selenium.start({}, (err_, proc_) => {
-          server = proc_
         })
 
+          /* Start selenium again */
+          .then(() => {
+            selenium.start({}, (err_, proc_) => {
+              server = proc_
+              done()
+            })
+          })
+
       /* Otherwise, throw error */
       } else {
         throw err
@@ -53,20 +67,21 @@ export const start = done => {
     }
 
     /* Remember process handle */
-    server = server || proc
+    server = proc
     done()
   })
 }
 
-export const stop = () => {
+/**
-  if (server)
+ * Stop Selenium
+ *
+ * @param {Function} done - Resolve callback
+ */
+export const stop = done => {
+  if (server) {
+    if (typeof done === "function")
+      server.on("exit", done)
     server.kill()
+    server = null
+  }
 }
-
-/* ----------------------------------------------------------------------------
- * Signal handler
- * ------------------------------------------------------------------------- */
-
-/* Register signal handler for all relevant events */
-for (const signal of ["SIGTERM", "SIGINT", "exit"])
-  process.on(signal, stop)

lib/tasks/.eslintrc

@@ -1,5 +0,0 @@
-{
-  "rules": {
-    "no-invalid-this": 0
-  }
-}

lib/tasks/assets/javascripts/build/application.js

@@ -50,12 +50,13 @@ export default (gulp, config, args) => {
           ],
           output: {
             filename: "application.js",
-            library: "Application"
+            library: "app",
+            libraryTarget: "window"
           },
           module: {
 
             /* Transpile ES6 to ES5 with Babel */
-            loaders: [
+            rules: [
               {
                 loader: "babel-loader",
                 test: /\.jsx?$/
@@ -65,7 +66,7 @@ export default (gulp, config, args) => {
           plugins: [
 
             /* Don't emit assets that include errors */
-            new webpack.NoErrorsPlugin(),
+            new webpack.NoEmitOnErrorsPlugin(),
 
             /* Provide JSX helper */
             new webpack.ProvidePlugin({
@@ -77,19 +78,30 @@ export default (gulp, config, args) => {
             args.optimize ? [
               new webpack.optimize.UglifyJsPlugin({
                 compress: {
-                  warnings: false
+                  warnings: false,
+                  screw_ie8: true,     // eslint-disable-line camelcase
+                  conditionals: true,
+                  unused: true,
+                  comparisons: true,
+                  sequences: true,
+                  dead_code: true,     // eslint-disable-line camelcase
+                  evaluate: true,
+                  if_return: true,     // eslint-disable-line camelcase
+                  join_vars: true      // eslint-disable-line camelcase
+                },
+                output: {
+                  comments: false
                 }
               })
             ] : []),
 
           /* Module resolver */
           resolve: {
-            modulesDirectories: [
+            modules: [
               "src/assets/javascripts",
               "node_modules"
             ],
             extensions: [
-              "",
               ".js",
               ".jsx"
             ]
@@ -101,8 +113,8 @@ export default (gulp, config, args) => {
           },
 
           /* Sourcemap support */
-          devtool: args.sourcemaps ? "source-map" : ""
+          devtool: args.sourcemaps ? "inline-source-map" : ""
-        }))
+        }, webpack))
 
       /* Revisioning */
       .pipe(gulpif(args.revision, rev()))

lib/tasks/assets/javascripts/lint.js

@@ -23,6 +23,7 @@
 import path from "path"
 import through from "through2"
 import util from "gulp-util"
+
 import { CLIEngine } from "eslint"
 
 /* ----------------------------------------------------------------------------

lib/tasks/assets/stylesheets/build.js

@@ -25,6 +25,7 @@ import gulpif from "gulp-if"
 import mincss from "gulp-cssnano"
 import mqpacker from "css-mqpacker"
 import postcss from "gulp-postcss"
+import pseudoclasses from "postcss-pseudo-classes"
 import rev from "gulp-rev"
 import sass from "gulp-sass"
 import sourcemaps from "gulp-sourcemaps"
@@ -54,7 +55,11 @@ export default (gulp, config, args) => {
         postcss([
           autoprefixer(),
           mqpacker
-        ]))
+        ].concat(!args.optimize ? [
+          pseudoclasses({
+            "restrictTo": ["hover", "focus"]
+          })
+        ] : [])))
 
       /* Minify sources */
       .pipe(gulpif(args.optimize, mincss()))
@@ -63,7 +68,7 @@ export default (gulp, config, args) => {
       .pipe(gulpif(args.revision, rev()))
       .pipe(gulpif(args.revision,
         version({ manifest: gulp.src("manifest.json") })))
-      .pipe(gulpif(args.sourcemaps, sourcemaps.write(".")))
+      .pipe(gulpif(args.sourcemaps, sourcemaps.write()))
       .pipe(gulp.dest(`${config.assets.build}/stylesheets`))
       .pipe(gulpif(args.revision,
         rev.manifest("manifest.json", {

lib/tasks/mkdocs/serve.js

@@ -39,7 +39,7 @@ export default () => {
       server.kill()
 
     /* Spawn MkDocs server */
-    server = child.spawn("mkdocs", ["serve", "-a", "0.0.0.0:8000"], {
+    server = child.spawn("mkdocs", ["serve", "--dev-addr", "0.0.0.0:8000"], {
       stdio: "inherit"
     })
   }

lib/tasks/tests/visual/clean.js

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import clean from "del"
+import vinyl from "vinyl-paths"
+
+/* ----------------------------------------------------------------------------
+ * Task: clean files generated by visual tests
+ * ------------------------------------------------------------------------- */
+
+export default (gulp, config) => {
+  return () => {
+    return gulp.src([
+      `${config.tests.visual}/data`,
+      "./gemini-report"
+    ])
+      .pipe(vinyl(clean))
+  }
+}

lib/tasks/tests/visual/generate.js

@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import child from "child_process"
+import path from "path"
+import through from "through2"
+import util from "gulp-util"
+
+/* ----------------------------------------------------------------------------
+ * Task: generate visual tests
+ * ------------------------------------------------------------------------- */
+
+export default (gulp, config) => {
+  const theme = path.resolve(process.cwd(), config.views.build)
+  return () => {
+    return gulp.src(`${config.tests.visual}/suites/**/mkdocs.yml`)
+      .pipe(
+        through.obj(function(file, enc, done) {
+          if (file.isNull() || file.isStream())
+            return done()
+
+          /* Resolve test name and destination */
+          const name = path.relative(`${config.tests.visual}/suites`,
+            path.dirname(file.path))
+          const site = path.resolve(process.cwd(),
+            `${config.tests.visual}/data`, name, "_")
+
+          /* Generate test fixtures with freshly built theme */
+          const proc = child.spawnSync("mkdocs", [
+            "build", "--site-dir", site, "--theme-dir", theme
+          ], {
+            cwd: path.dirname(file.path)
+          })
+
+            /* Emit error, if any */
+          if (proc.status)
+            this.emit("error", new util.PluginError("mkdocs",
+                `Terminated with errors: ${proc.stderr.toString()}`))
+
+          /* Terminate */
+          done()
+        }))
+  }
+}

lib/tasks/tests/visual/run.js

@@ -0,0 +1,166 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import moniker from "moniker"
+import path from "path"
+import * as ecstatic from "~/lib/servers/ecstatic"
+import * as sauce from "~/lib/servers/sauce-connect"
+import * as selenium from "~/lib/servers/selenium"
+
+import Gemini from "gemini"
+import SauceLabs from "saucelabs"
+
+/* ----------------------------------------------------------------------------
+ * Locals
+ * ------------------------------------------------------------------------- */
+
+/* SauceLabs job name */
+const id = process.env.TRAVIS
+  ? `Travis #${process.env.TRAVIS_BUILD_NUMBER}`
+  : `Local #${moniker.choose()}`
+
+/* SauceLabs test results */
+const passed = {}
+
+/* ----------------------------------------------------------------------------
+ * Task: run visual tests
+ * ------------------------------------------------------------------------- */
+
+export default (gulp, config, args) => {
+  return done => {
+
+    /* Start static file server */
+    let error = false
+    new Promise(resolve => {
+      ecstatic.start(`${config.tests.visual}/data`, 8000, resolve)
+
+    /* Create and start test runner */
+    }).then(() => {
+      return new Promise((resolve, reject) => {
+
+        /* Start SauceConnect tunnel */
+        if (process.env.CI || process.env.SAUCE) {
+          if (!process.env.SAUCE_USERNAME ||
+              !process.env.SAUCE_ACCESS_KEY)
+            throw new Error(
+              "SauceConnect: please provide SAUCE_USERNAME " +
+              "and SAUCE_ACCESS_KEY")
+
+          /* Start tunnel, if credentials are given */
+          sauce.start(
+            id,
+            process.env.SAUCE_USERNAME,
+            process.env.SAUCE_ACCESS_KEY,
+            err => {
+              return err ? reject(err) : resolve(sauce)
+            })
+
+        /* Start Selenium */
+        } else {
+          selenium.start(() => resolve(selenium))
+        }
+      })
+
+        /* Setup and run Gemini */
+        .then(runner => {
+          const setup = require(
+            path.join(process.cwd(), `${config.tests.visual}/config`,
+              process.env.CI || process.env.SAUCE
+                ? "gemini.sauce-connect.json"
+                : "gemini.selenium.json"))
+
+          /* Add dynamic configuration to capabilities */
+          for (const key of Object.keys(setup.browsers)) {
+            const caps = setup.browsers[key].desiredCapabilities
+            caps.tunnelIdentifier = id
+            caps.public = "private"
+            caps.name = id
+
+            /* Adjust configuration for Travis CI */
+            if (process.env.CI && process.env.TRAVIS)
+              caps.public = "public"
+          }
+
+          /* Setup Gemini and test listeners */
+          const gemini = new Gemini(setup)
+          if (process.env.CI || process.env.SAUCE) {
+
+            /* Initialize test run */
+            gemini.on(gemini.events.START_BROWSER, job => {
+              passed[job.sessionId] = true
+            })
+
+            /* Update state of test run */
+            gemini.on(gemini.events.TEST_RESULT, job => {
+              passed[job.sessionId] = passed[job.sessionId] && job.equal
+            })
+          }
+
+          /* Run tests */
+          return gemini.test(`${config.tests.visual}/suites`, {
+            reporters: ["flat", "html"],
+            browsers: args.browsers ? [].concat(args.browsers) : null
+          })
+
+            /* Return runner for graceful stop */
+            .then(status => {
+              error = status.failed + status.errored > 0
+              return runner
+            })
+        })
+
+        /* Stop test runner */
+        .then(runner => {
+          return new Promise(resolve => {
+            runner.stop(resolve)
+          })
+        })
+
+        /* Update SauceLabs jobs with test results */
+        .then(() => {
+          const saucelabs = new SauceLabs({
+            username: process.env.SAUCE_USERNAME,
+            password: process.env.SAUCE_ACCESS_KEY
+          })
+          const updates = Object.keys(passed).map(sessionId => {
+            return new Promise(resolve => {
+              saucelabs.updateJob(sessionId, {
+                passed: passed[sessionId]
+              }, resolve)
+            })
+          })
+          return Promise.all(updates)
+        })
+
+    /* Stop static file server */
+    })
+      .then(() => {
+        ecstatic.stop(() => {
+          return error
+            ? done(new Error("Gemini terminated with errors"))
+            : done()
+        })
+      }, err => {
+        return done(new Error(err))
+      })
+  }
+}

lib/tasks/tests/visual/session.js

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import moniker from "moniker"
+import * as ecstatic from "~/lib/servers/ecstatic"
+import * as sauce from "~/lib/servers/sauce-connect"
+
+/* ----------------------------------------------------------------------------
+ * Task: run visual tests
+ * ------------------------------------------------------------------------- */
+
+export default (gulp, config) => {
+  return done => {
+
+    /* Start static file server */
+    new Promise(resolve => {
+      ecstatic.start(`${config.tests.visual}/data`, 8000, resolve)
+
+    /* Open SauceConnect tunnel */
+    }).then(() => {
+      return new Promise((resolve, reject) => {
+        if (!process.env.SAUCE_USERNAME ||
+            !process.env.SAUCE_ACCESS_KEY)
+          throw new Error(
+            "SauceConnect: please provide SAUCE_USERNAME " +
+            "and SAUCE_ACCESS_KEY")
+
+        /* Open tunnel */
+        sauce.start(
+          `Local #${moniker.choose()}`,
+          process.env.SAUCE_USERNAME,
+          process.env.SAUCE_ACCESS_KEY,
+          err => {
+            return err ? reject(err) : resolve(sauce)
+          })
+      })
+
+        /* Close tunnel on CTRL-C */
+        .then(() => {
+          return new Promise(resolve => {
+            process.on("SIGINT", () => {
+              sauce.stop(resolve)
+            })
+          })
+        })
+
+    /* Stop static file server */
+    })
+      .then(() => {
+        ecstatic.stop(done)
+      }, err => {
+        return done(err)
+      })
+  }
+}

lib/tasks/tests/visual/update.js

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import fs from "fs"
+import path from "path"
+import through from "through2"
+
+/* ----------------------------------------------------------------------------
+ * Task: update reference images for visual tests
+ * ------------------------------------------------------------------------- */
+
+export default (gulp, config) => {
+  return () => {
+    const base = path.join(
+      process.cwd(), `${config.tests.visual}/config`)
+
+    /* Read Gemini configs and map browsers to screenshot directories */
+    const mapping = fs.readdirSync(base)
+      .reduce((result, filename) => {
+        return Object.assign(result, (gemini => {
+          return Object.keys(gemini.browsers)
+            .reduce((browsers, name) => {
+              browsers[name] = gemini.screenshotsDir
+              return browsers
+            }, {})
+        })(require(path.join(base, filename))))
+      }, {})
+
+    /* Prepare filenames */
+    const dest = path.join(process.cwd(), `${config.tests.visual}/baseline`)
+    return gulp.src("gemini-report/images/**/*~current.png")
+      .pipe(
+        through.obj(function(file, enc, done) {
+          if (file.isNull() || file.isStream())
+            return done()
+
+          /* Remove the state from the filename */
+          file.path = file.path.replace("~current", "")
+
+          /* Retrieve the folder for the environment of the baseline */
+          const folder = path.relative(dest,
+            mapping[path.basename(file.path, ".png")])
+          file.path = file.path.replace("images", `images/${folder}`)
+
+          /* Push file to next stage */
+          this.push(file)
+          done()
+        }))
+
+      /* Update reference images */
+      .pipe(gulp.dest(dest))
+  }
+}

material/base.html

@@ -19,7 +19,7 @@
       {% else %}
         <link rel="shortcut icon" href="{{ base_url }}/assets/images/favicon.png">
       {% endif %}
-      <meta name="generator" content="mkdocs+mkdocs-material#1.0.3">
+      <meta name="generator" content="mkdocs-{{ mkdocs_version }}, mkdocs-material-1.0.3">
     {% endblock %}
     {% block htmltitle %}
       {% if page.title and not page.is_homepage %}
@@ -29,7 +29,13 @@
       {% endif %}
     {% endblock %}
     {% block libs %}
-      <script src="{{ base_url }}/assets/javascripts/modernizr-facb31f4a3.js"></script>
+      <script src="{{ base_url }}/assets/javascripts/modernizr-5b0c41c2b5.js"></script>
+    {% endblock %}
+    {% block styles %}
+      <link rel="stylesheet" href="{{ base_url }}/assets/stylesheets/application-932e030699.css">
+      {% if config.extra.palette %}
+        <link rel="stylesheet" href="{{ base_url }}/assets/stylesheets/application-02ce7adcc2.palette.css">
+      {% endif %}
     {% endblock %}
     {% block fonts %}
       {% if config.extra.font != "none" %}
@@ -42,15 +48,9 @@
       {% endif %}
       <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
     {% endblock %}
-    {% block styles %}
+    {% for path in extra_css %}
-      <link rel="stylesheet" href="{{ base_url }}/assets/stylesheets/application-22ac52ce22.css">
+      <link rel="stylesheet" href="{{ path }}">
-      {% if config.extra.palette %}
+    {% endfor %}
-        <link rel="stylesheet" href="{{ base_url }}/assets/stylesheets/application-02ce7adcc2.palette.css">
-      {% endif %}
-      {% for path in extra_css %}
-        <link rel="stylesheet" href="{{ path }}">
-      {% endfor %}
-    {% endblock %}
     {% block extrahead %}{% endblock %}
   </head>
   {% set palette = config.extra.get("palette", {}) %}
@@ -112,7 +112,7 @@
                  <a href="{{ page.edit_url }}" title="{{ lang.t('edit.link.title') }}" class="md-icon md-content__edit">edit</a>
                {% endif %}
               {% block content %}
-                {% if not "\x3ch1 id=" in page.content %}
+                {% if not "\x3ch1" in page.content %}
                   <h1>{{ page.title | default(config.site_name, true)}}</h1>
                 {% endif %}
                 {{ page.content }}
@@ -126,8 +126,8 @@
       {% endblock %}
     </div>
     {% block scripts %}
-      <script src="{{ base_url }}/assets/javascripts/application-baa758dc1b.js"></script>
+      <script src="{{ base_url }}/assets/javascripts/application-c7c31dee65.js"></script>
-      <script>var config={url:{base:"{{ base_url }}"}},app=new Application(config);app.initialize()</script>
+      <script>app.initialize({url:{base:"{{ base_url }}"}})</script>
       {% for path in extra_javascript %}
         <script src="{{ path }}"></script>
       {% endfor %}

material/partials/nav-item.html

@@ -26,10 +26,10 @@
   <li class="md-nav__item">
     {% set toc_ = page.toc %}
     <input class="md-toggle md-nav__toggle" data-md-toggle="toc" type="checkbox" id="toc">
-    {% if "\x3ch1 id=" in page.content %}
+    {% if toc_ | first is defined %}
       {% set toc_ = (toc_ | first).children %}
     {% endif %}
-    {% if toc_ and (toc_ | first) %}
+    {% if toc_ | first is defined %}
       <label class="md-nav__link md-nav__link--active" for="toc">
         {{ nav_item.title }}
       </label>
@@ -37,7 +37,7 @@
     <a href="{{ nav_item.url }}" title="{{ nav_item.title }}" class="md-nav__link md-nav__link--active">
       {{ nav_item.title }}
     </a>
-    {% if page.toc %}
+    {% if toc_ | first is defined %}
       {% include "partials/toc.html" %}
     {% endif %}
   </li>

material/partials/toc.html

@@ -1,10 +1,10 @@
 {% import "partials/language.html" as lang %}
 <nav class="md-nav md-nav--secondary">
   {% set toc_ = page.toc %}
-  {% if "\x3ch1 id=" in page.content %}
+  {% if toc_ | first is defined and "\x3ch1 id=" in page.content %}
     {% set toc_ = (toc_ | first).children %}
   {% endif %}
-  {% if toc_ and (toc_ | first) %}
+  {% if toc_ | first is defined %}
     <label class="md-nav__title" for="toc">{{ lang.t('toc.title') }}</label>
     <ul class="md-nav__list" data-md-scrollfix>
       {% for toc_item in toc_ %}

mkdocs.yml

@@ -31,7 +31,7 @@ repo_url: https://github.com/squidfunk/mkdocs-material
 # Copyright
 copyright: 'Copyright © 2016 - 2017 Martin Donath'
 
-# Documentation and theme
+# Theme directory
 theme_dir: material
 
 # Options

package.json

@@ -27,11 +27,14 @@
     "clean": "scripts/clean",
     "lint": "scripts/lint",
     "start": "scripts/start",
-    "test": "scripts/test"
+    "test:visual:run": "scripts/test/visual/run",
+    "test:visual:update": "scripts/test/visual/update",
+    "test:visual:session": "scripts/test/visual/session"
   },
   "dependencies": {},
   "devDependencies": {
     "autoprefixer": "^6.6.1",
+    "babel-core": "^6.0.0",
     "babel-eslint": "^7.1.1",
     "babel-loader": "^6.2.10",
     "babel-plugin-add-module-exports": "^0.2.1",
@@ -40,13 +43,12 @@
     "babel-preset-es2015": "^6.22.0",
     "babel-register": "^6.18.0",
     "babel-root-import": "^4.1.5",
-    "chai": "^3.5.0",
     "core-js": "^2.4.1",
     "css-mqpacker": "^5.0.1",
     "custom-event-polyfill": "^0.3.0",
     "del": "^2.2.2",
+    "ecstatic": "^2.1.0",
     "eslint": "^3.14.0",
-    "eslint-plugin-mocha": "^4.8.0",
     "fastclick": "^1.0.6",
     "git-hooks": "^1.1.7",
     "gulp": "^3.9.1",
@@ -70,6 +72,27 @@
     "gulp-uglify": "^2.0.0",
     "gulp-util": "^3.0.8",
     "js-cookie": "^2.1.3",
+    "lunr": "^0.7.2",
+    "material-design-color": "^2.3.2",
+    "material-shadows": "^3.0.1",
+    "modularscale-sass": "^2.1.1",
+    "node-notifier": "^5.0.0",
+    "postcss-pseudo-classes": "^0.1.0",
+    "stylelint": "^7.8.0",
+    "stylelint-config-standard": "^16.0.0",
+    "stylelint-order": "^0.2.2",
+    "stylelint-scss": "^1.4.1",
+    "through2": "^2.0.3",
+    "vinyl-paths": "^2.1.0",
+    "webpack": "^2.2.1",
+    "webpack-stream": "^3.2.0",
+    "whatwg-fetch": "^2.0.1",
+    "yargs": "^6.6.0"
+  },
+  "optionalDependencies": {
+    "chai": "^3.5.0",
+    "eslint-plugin-mocha": "^4.8.0",
+    "gemini": "^4.14.3",
     "karma": "^1.3.0",
     "karma-chrome-launcher": "^2.0.0",
     "karma-coverage": "^1.1.1",
@@ -78,26 +101,14 @@
     "karma-sourcemap-loader": "^0.3.7",
     "karma-spec-reporter": "0.0.26",
     "karma-webpack": "^2.0.1",
-    "lunr": "^0.7.2",
-    "material-design-color": "^2.3.2",
-    "material-shadows": "^3.0.1",
     "mocha": "^3.2.0",
-    "modularscale-sass": "^2.1.1",
+    "moniker": "^0.1.2",
-    "node-notifier": "^5.0.0",
+    "saucelabs": "^1.4.0",
-    "selenium-standalone": "^5.9.1",
+    "sauce-connect-launcher": "^1.2.0",
-    "stylelint": "^7.7.1",
+    "selenium-standalone": "^6.0.0"
-    "stylelint-config-standard": "^15.0.1",
-    "stylelint-order": "^0.2.2",
-    "stylelint-scss": "^1.4.1",
-    "through2": "^2.0.3",
-    "vinyl-paths": "^2.1.0",
-    "webpack": "^1.14.0",
-    "webpack-stream": "^3.2.0",
-    "whatwg-fetch": "^2.0.1",
-    "yargs": "^6.6.0"
   },
   "engines": {
-    "node": ">= 4.5.0"
+    "node": ">= 5.0.0"
   },
   "private": true
 }

requirements.txt

@@ -20,4 +20,4 @@
 
 mkdocs>=0.16
 pygments
-pymdown-extensions
+pymdown-extensions>=1.2

scripts/build

@@ -28,4 +28,4 @@ if [[ ! -d `npm bin` ]]; then
 fi
 
 # Run command
-`npm bin`/gulp build --clean --optimize --revision
+`npm bin`/gulp build --clean --optimize --revision "$@"

scripts/clean

@@ -28,4 +28,4 @@ if [[ ! -d `npm bin` ]]; then
 fi
 
 # Run command
-`npm bin`/gulp clean
+`npm bin`/gulp clean "$@"

scripts/start

@@ -28,4 +28,4 @@ if [[ ! -d `npm bin` ]]; then
 fi
 
 # Run command
-`npm bin`/gulp watch --no-lint
+`npm bin`/gulp watch --no-lint "$@"

scripts/test/visual/run

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to
+# deal in the Software without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+# sell copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+
+# Check if "npm install" was executed
+if [[ ! -d `npm bin` ]]; then
+  echo "\"node_modules\" not found:"
+  echo "npm install"
+  exit 1
+fi
+
+# Run command
+`npm bin`/gulp tests:visual:run --clean --no-optimize "$@"

scripts/test/visual/session

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to
+# deal in the Software without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+# sell copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+
+# Check if "npm install" was executed
+if [[ ! -d `npm bin` ]]; then
+  echo "\"node_modules\" not found:"
+  echo "npm install"
+  exit 1
+fi
+
+# Run command
+`npm bin`/gulp tests:visual:session "$@"

scripts/test/visual/update

@@ -28,4 +28,4 @@ if [[ ! -d `npm bin` ]]; then
 fi
 
 # Run command
-`npm bin`/gulp test
+`npm bin`/gulp tests:visual:update "$@"

src/.babelrc

@@ -0,0 +1,10 @@
+{
+  "presets": [
+    ["es2015", { "modules": false }]
+  ],
+  "plugins": [
+    ["transform-react-jsx", {
+      "pragma": "JSX.createElement"
+    }]
+  ]
+}

src/assets/javascripts/application.js

@@ -27,231 +27,215 @@ import Material from "./components/Material"
  * Application
  * ------------------------------------------------------------------------- */
 
-export default class Application {
+export const initialize = config => {
 
-  /**
+  /* Initialize Modernizr and FastClick */
-   * Create the application
+  new Material.Event.Listener(document, "DOMContentLoaded", () => {
-   *
-   * @constructor
-   * @param  {object} config Configuration object
-   */
-  constructor(config) {
-    this.config_ = config
-  }
 
-  /**
+    /* Test for iOS */
-   * Initialize all components and listeners
+    Modernizr.addTest("ios", () => {
-   */
+      return !!navigator.userAgent.match(/(iPad|iPhone|iPod)/g)
-  initialize() {
+    })
 
-    /* Initialize Modernizr and FastClick */
+    /* Test for web application context */
-    new Material.Event.Listener(document, "DOMContentLoaded", () => {
+    Modernizr.addTest("standalone", () => {
+      return !!navigator.standalone
+    })
 
-      /* Test for iOS */
+    /* Attach FastClick to mitigate 300ms delay on touch devices */
-      Modernizr.addTest("ios", () => {
+    FastClick.attach(document.body)
-        return !!navigator.userAgent.match(/(iPad|iPhone|iPod)/g)
-      })
 
-      /* Test for web application context */
+    /* Wrap all data tables for better overflow scrolling */
-      Modernizr.addTest("standalone", () => {
+    const tables = document.querySelectorAll("table:not([class])")
-        return !!navigator.standalone
+    Array.prototype.forEach.call(tables, table => {
-      })
+      const wrap = document.createElement("div")
+      wrap.classList.add("md-typeset__table")
+      if (table.nextSibling) {
+        table.parentNode.insertBefore(wrap, table.nextSibling)
+      } else {
+        table.parentNode.appendChild(wrap)
+      }
+      wrap.appendChild(table)
+    })
 
-      /* Attack FastClick to mitigate 300ms delay on touch devices */
+    /* Force 1px scroll offset to trigger overflow scrolling */
-      FastClick.attach(document.body)
+    if (Modernizr.ios) {
+      const scrollable = document.querySelectorAll("[data-md-scrollfix]")
+      Array.prototype.forEach.call(scrollable, item => {
+        item.addEventListener("touchstart", () => {
+          const top = item.scrollTop
 
-      /* Wrap all data tables for better overflow scrolling */
+          /* We're at the top of the container */
-      const tables = document.querySelectorAll("table:not([class])")
+          if (top === 0) {
-      Array.prototype.forEach.call(tables, table => {
+            item.scrollTop = 1
-        const wrap = document.createElement("div")
-        wrap.classList.add("md-typeset__table")
-        if (table.nextSibling) {
-          table.parentNode.insertBefore(wrap, table.nextSibling)
-        } else {
-          table.parentNode.appendChild(wrap)
-        }
-        wrap.appendChild(table)
-      })
-
-      /* Force 1px scroll offset to trigger overflow scrolling */
-      if (Modernizr.ios) {
-        const scrollable = document.querySelectorAll("[data-md-scrollfix]")
-        Array.prototype.forEach.call(scrollable, item => {
-          item.addEventListener("touchstart", () => {
-            const top = item.scrollTop
-
-            /* We're at the top of the container */
-            if (top === 0) {
-              item.scrollTop = 1
 
             /* We're at the bottom of the container */
-            } else if (top + item.offsetHeight === item.scrollHeight) {
+          } else if (top + item.offsetHeight === item.scrollHeight) {
-              item.scrollTop = top - 1
+            item.scrollTop = top - 1
-            }
+          }
-          })
         })
-      }
+      })
-    }).listen()
+    }
+  }).listen()
 
-    /* Component: header shadow toggle */
+  /* Component: header shadow toggle */
-    new Material.Event.MatchMedia("(min-width: 1220px)",
+  new Material.Event.MatchMedia("(min-width: 1220px)",
-      new Material.Event.Listener(window, [
-        "scroll", "resize", "orientationchange"
-      ], new Material.Header.Shadow("[data-md-component=container]")))
-
-    /* Component: tabs visibility toggle */
     new Material.Event.Listener(window, [
       "scroll", "resize", "orientationchange"
-    ], new Material.Tabs.Toggle("[data-md-component=tabs]")).listen()
+    ], new Material.Header.Shadow("[data-md-component=container]")))
 
-    /* Component: sidebar container */
+  /* Component: tabs visibility toggle */
-    if (!Modernizr.csscalc)
+  new Material.Event.Listener(window, [
-      new Material.Event.MatchMedia("(min-width: 960px)",
+    "scroll", "resize", "orientationchange"
-        new Material.Event.Listener(window, [
+  ], new Material.Tabs.Toggle("[data-md-component=tabs]")).listen()
-          "resize", "orientationchange"
-        ], new Material.Sidebar.Container("[data-md-component=container]")))
 
-    /* Component: sidebar with navigation */
+  /* Component: sidebar container */
-    new Material.Event.MatchMedia("(min-width: 1220px)",
+  if (!Modernizr.csscalc)
-      new Material.Event.Listener(window, [
-        "scroll", "resize", "orientationchange"
-      ], new Material.Sidebar.Position("[data-md-component=navigation]")))
-
-    /* Component: sidebar with table of contents - register two separate
-       listeners, as the offset at the top might change */
-    new Material.Event.MatchMedia("(min-width: 960px) and (max-width: 1219px)",
-      new Material.Event.Listener(window, [
-        "scroll", "resize", "orientationchange"
-      ], new Material.Sidebar.Position("[data-md-component=toc]")))
-    new Material.Event.MatchMedia("(min-width: 1220px)",
-      new Material.Event.Listener(window, [
-        "scroll", "resize", "orientationchange"
-      ], new Material.Sidebar.Position("[data-md-component=toc]")))
-
-    /* Component: link blurring for table of contents */
     new Material.Event.MatchMedia("(min-width: 960px)",
-      new Material.Event.Listener(window, "scroll",
+      new Material.Event.Listener(window, [
-        new Material.Nav.Blur("[data-md-component=toc] [href]")))
+        "resize", "orientationchange"
+      ], new Material.Sidebar.Container("[data-md-component=container]")))
 
-    /* Component: collapsible elements for navigation */
+  /* Component: sidebar with navigation */
-    const collapsibles =
+  new Material.Event.MatchMedia("(min-width: 1220px)",
-      document.querySelectorAll("[data-md-component=collapsible]")
+    new Material.Event.Listener(window, [
-    Array.prototype.forEach.call(collapsibles, collapse => {
+      "scroll", "resize", "orientationchange"
-      new Material.Event.MatchMedia("(min-width: 1220px)",
+    ], new Material.Sidebar.Position("[data-md-component=navigation]")))
-        new Material.Event.Listener(collapse.previousElementSibling, "click",
-          new Material.Nav.Collapse(collapse)))
-    })
 
-    /* Component: active pane monitor for iOS scrolling fixes */
+  /* Component: sidebar with table of contents - register two separate
-    new Material.Event.MatchMedia("(max-width: 1219px)",
+     listeners, as the offset at the top might change */
-      new Material.Event.Listener(
+  new Material.Event.MatchMedia("(min-width: 960px) and (max-width: 1219px)",
-        "[data-md-component=navigation] [data-md-toggle]", "change",
+    new Material.Event.Listener(window, [
-          new Material.Nav.Scrolling("[data-md-component=navigation] nav")))
+      "scroll", "resize", "orientationchange"
+    ], new Material.Sidebar.Position("[data-md-component=toc]")))
+  new Material.Event.MatchMedia("(min-width: 1220px)",
+    new Material.Event.Listener(window, [
+      "scroll", "resize", "orientationchange"
+    ], new Material.Sidebar.Position("[data-md-component=toc]")))
 
-    /* Component: search body lock for mobile */
+  /* Component: link blurring for table of contents */
-    new Material.Event.MatchMedia("(max-width: 959px)",
+  new Material.Event.MatchMedia("(min-width: 960px)",
-      new Material.Event.Listener("[data-md-toggle=search]", "change",
+    new Material.Event.Listener(window, "scroll",
-        new Material.Search.Lock("[data-md-toggle=search]")))
+      new Material.Nav.Blur("[data-md-component=toc] [href]")))
 
-    /* Component: search results */
+  /* Component: collapsible elements for navigation */
-    new Material.Event.Listener(document.forms.search.query, [
+  const collapsibles =
-      "focus", "keyup"
+    document.querySelectorAll("[data-md-component=collapsible]")
-    ], new Material.Search.Result("[data-md-component=result]", () => {
+  Array.prototype.forEach.call(collapsibles, collapse => {
-      return fetch(`${this.config_.url.base}/mkdocs/search_index.json`, {
+    new Material.Event.MatchMedia("(min-width: 1220px)",
-        credentials: "same-origin"
+      new Material.Event.Listener(collapse.previousElementSibling, "click",
-      }).then(response => response.json())
+        new Material.Nav.Collapse(collapse)))
-        .then(data => {
+  })
-          return data.docs.map(doc => {
+
-            doc.location = this.config_.url.base + doc.location
+  /* Component: active pane monitor for iOS scrolling fixes */
-            return doc
+  new Material.Event.MatchMedia("(max-width: 1219px)",
-          })
+    new Material.Event.Listener(
+      "[data-md-component=navigation] [data-md-toggle]", "change",
+        new Material.Nav.Scrolling("[data-md-component=navigation] nav")))
+
+  /* Component: search body lock for mobile */
+  new Material.Event.MatchMedia("(max-width: 959px)",
+    new Material.Event.Listener("[data-md-toggle=search]", "change",
+      new Material.Search.Lock("[data-md-toggle=search]")))
+
+  /* Component: search results */
+  new Material.Event.Listener(document.forms.search.query, [
+    "focus", "keyup"
+  ], new Material.Search.Result("[data-md-component=result]", () => {
+    return fetch(`${config.url.base}/mkdocs/search_index.json`, {
+      credentials: "same-origin"
+    }).then(response => response.json())
+      .then(data => {
+        return data.docs.map(doc => {
+          doc.location = config.url.base + doc.location
+          return doc
         })
-    })).listen()
-
-    /* Listener: prevent touches on overlay if navigation is active */
-    new Material.Event.MatchMedia("(max-width: 1219px)",
-      new Material.Event.Listener("[data-md-component=overlay]", "touchstart",
-        ev => ev.preventDefault()))
-
-    /* Listener: close drawer when anchor links are clicked */
-    new Material.Event.MatchMedia("(max-width: 959px)",
-      new Material.Event.Listener("[data-md-component=navigation] [href^='#']",
-        "click", () => {
-          const toggle = document.querySelector("[data-md-toggle=drawer]")
-          if (toggle.checked) {
-            toggle.checked = false
-            toggle.dispatchEvent(new CustomEvent("change"))
-          }
-        }))
-
-    /* Listener: focus input after opening search */
-    new Material.Event.Listener("[data-md-toggle=search]", "change", ev => {
-      setTimeout(toggle => {
-        const query = document.forms.search.query
-        if (toggle.checked)
-          query.focus()
-      }, 400, ev.target)
-    }).listen()
-
-    /* Listener: open search on focus */
-    new Material.Event.MatchMedia("(min-width: 960px)",
-      new Material.Event.Listener(document.forms.search.query, "focus", () => {
-        const toggle = document.querySelector("[data-md-toggle=search]")
-        if (!toggle.checked) {
-          toggle.checked = true
-          toggle.dispatchEvent(new CustomEvent("change"))
-        }
-      }))
-
-    /* Listener: close search when clicking outside */
-    new Material.Event.MatchMedia("(min-width: 960px)",
-      new Material.Event.Listener(document.body, "click", () => {
-        const toggle = document.querySelector("[data-md-toggle=search]")
-        if (toggle.checked) {
-          toggle.checked = false
-          toggle.dispatchEvent(new CustomEvent("change"))
-        }
-      }))
-
-    /* Listener: disable search when ESC key is pressed */
-    new Material.Event.Listener(window, "keyup", ev => {
-      const code = ev.keyCode || ev.which
-      if (code === 27) {
-        const toggle = document.querySelector("[data-md-toggle=search]")
-        if (toggle.checked) {
-          toggle.checked = false
-          toggle.dispatchEvent(new CustomEvent("change"))
-          document.forms.search.query.blur()
-        }
-      }
-    }).listen()
-
-    /* Listener: fix unclickable toggle due to blur handler */
-    new Material.Event.MatchMedia("(min-width: 960px)",
-      new Material.Event.Listener("[data-md-toggle=search]", "click",
-        ev => ev.stopPropagation()))
-
-    /* Listener: prevent search from closing when clicking */
-    new Material.Event.MatchMedia("(min-width: 960px)",
-      new Material.Event.Listener("[data-md-component=search]", "click",
-        ev => ev.stopPropagation()))
-
-    /* Retrieve facts for the given repository type */
-    ;(() => {
-      const el = document.querySelector("[data-md-source]")
-      if (!el) return Promise.resolve([])
-      switch (el.dataset.mdSource) {
-        case "github": return new Material.Source.Adapter.GitHub(el).fetch()
-        default: return Promise.resolve([])
-      }
-
-    /* Render repository source information */
-    })().then(facts => {
-      const sources = document.querySelectorAll("[data-md-source]")
-      Array.prototype.forEach.call(sources, source => {
-        new Material.Source.Repository(source)
-          .initialize(facts)
       })
+  })).listen()
+
+  /* Listener: prevent touches on overlay if navigation is active */
+  new Material.Event.MatchMedia("(max-width: 1219px)",
+    new Material.Event.Listener("[data-md-component=overlay]", "touchstart",
+      ev => ev.preventDefault()))
+
+  /* Listener: close drawer when anchor links are clicked */
+  new Material.Event.MatchMedia("(max-width: 959px)",
+    new Material.Event.Listener("[data-md-component=navigation] [href^='#']",
+      "click", () => {
+        const toggle = document.querySelector("[data-md-toggle=drawer]")
+        if (toggle.checked) {
+          toggle.checked = false
+          toggle.dispatchEvent(new CustomEvent("change"))
+        }
+      }))
+
+  /* Listener: focus input after opening search */
+  new Material.Event.Listener("[data-md-toggle=search]", "change", ev => {
+    setTimeout(toggle => {
+      const query = document.forms.search.query
+      if (toggle.checked)
+        query.focus()
+    }, 400, ev.target)
+  }).listen()
+
+  /* Listener: open search on focus */
+  new Material.Event.MatchMedia("(min-width: 960px)",
+    new Material.Event.Listener(document.forms.search.query, "focus", () => {
+      const toggle = document.querySelector("[data-md-toggle=search]")
+      if (!toggle.checked) {
+        toggle.checked = true
+        toggle.dispatchEvent(new CustomEvent("change"))
+      }
+    }))
+
+  /* Listener: close search when clicking outside */
+  new Material.Event.MatchMedia("(min-width: 960px)",
+    new Material.Event.Listener(document.body, "click", () => {
+      const toggle = document.querySelector("[data-md-toggle=search]")
+      if (toggle.checked) {
+        toggle.checked = false
+        toggle.dispatchEvent(new CustomEvent("change"))
+      }
+    }))
+
+  /* Listener: disable search when ESC key is pressed */
+  new Material.Event.Listener(window, "keyup", ev => {
+    const code = ev.keyCode || ev.which
+    if (code === 27) {
+      const toggle = document.querySelector("[data-md-toggle=search]")
+      if (toggle.checked) {
+        toggle.checked = false
+        toggle.dispatchEvent(new CustomEvent("change"))
+        document.forms.search.query.blur()
+      }
+    }
+  }).listen()
+
+  /* Listener: fix unclickable toggle due to blur handler */
+  new Material.Event.MatchMedia("(min-width: 960px)",
+    new Material.Event.Listener("[data-md-toggle=search]", "click",
+      ev => ev.stopPropagation()))
+
+  /* Listener: prevent search from closing when clicking */
+  new Material.Event.MatchMedia("(min-width: 960px)",
+    new Material.Event.Listener("[data-md-component=search]", "click",
+      ev => ev.stopPropagation()))
+
+  /* Retrieve facts for the given repository type */
+  ;(() => {
+    const el = document.querySelector("[data-md-source]")
+    if (!el) return Promise.resolve([])
+    switch (el.dataset.mdSource) {
+      case "github": return new Material.Source.Adapter.GitHub(el).fetch()
+      default: return Promise.resolve([])
+    }
+
+  /* Render repository source information */
+  })().then(facts => {
+    const sources = document.querySelectorAll("[data-md-source]")
+    Array.prototype.forEach.call(sources, source => {
+      new Material.Source.Repository(source)
+        .initialize(facts)
     })
-  }
+  })
 }

src/assets/stylesheets/base/_typeset.scss

@@ -34,14 +34,9 @@ body {
 body,
 input {
   color: $md-color-black;
-  // font-family: "Roboto", "Helvetica Neue", Helvetica, Arial, sans-serif;
   font-feature-settings: "kern", "onum", "liga";
+  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
   font-weight: 400;
-
-  // Use system fonts, if browser doesn't support webfonts
-  .no-fontface & {
-    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
-  }
 }
 
 // Proportionally spaced fonts
@@ -49,14 +44,9 @@ pre,
 code,
 kbd {
   color: $md-color-black;
-  // font-family: "Roboto Mono", "Courier New", Courier, monospace;
   font-feature-settings: "kern", "onum", "liga";
+  font-family: "Courier New", Courier, monospace;
   font-weight: 400;
-
-  // Use system fonts, if browser doesn't support webfonts
-  .no-fontface & {
-    font-family: "Courier New", Courier, monospace;
-  }
 }
 
 // ----------------------------------------------------------------------------

src/assets/stylesheets/layout/_footer.scss

@@ -50,8 +50,8 @@
     padding-bottom: 0.8rem;
     transition: opacity 0.25s;
 
-    // [mobile landscape +]: Set proportional width
+    // [tablet +]: Set proportional width
-    @include break-from-device(mobile landscape) {
+    @include break-from-device(tablet) {
       width: 50%;
     }
 
@@ -68,8 +68,8 @@
       // Title
       .md-footer-nav__title {
 
-        // [mobile portrait -]: Hide title for previous page
+        // [mobile -]: Hide title for previous page
-        @include break-to-device(mobile portrait) {
+        @include break-to-device(mobile) {
           display: none;
         }
       }

src/assets/stylesheets/layout/_nav.scss

@@ -84,7 +84,7 @@
     }
   }
 
-  // Icon buttons
+  // Button with logo
   &__button {
     @extend %md-icon, %md-icon__button;
 
@@ -141,7 +141,8 @@
       color: $md-color-primary;
     }
 
-    // Hovered link
+    // Focused or hovered item
+    &:focus,
     &:hover {
       color: $md-color-accent;
     }

src/base.html

@@ -56,7 +56,8 @@
       {% endif %}
 
       <!-- Generator banner -->
-      <meta name="generator" content="mkdocs+$theme-name$#$theme-version$" />
+      <meta name="generator"
+        content="mkdocs-{{ mkdocs_version }}, $theme-name$-$theme-version$" />
     {% endblock %}
 
     <!-- Block: site title -->
@@ -73,6 +74,20 @@
       <script src="{{ base_url }}/assets/javascripts/modernizr.js"></script>
     {% endblock %}
 
+    <!-- Block: stylesheets -->
+    {% block styles %}
+
+      <!-- Theme-related stylesheets -->
+      <link rel="stylesheet" type="text/css"
+          href="{{ base_url }}/assets/stylesheets/application.css" />
+
+      <!-- Extra color palette -->
+      {% if config.extra.palette %}
+        <link rel="stylesheet" type="text/css"
+            href="{{ base_url }}/assets/stylesheets/application.palette.css" />
+      {% endif %}
+    {% endblock %}
+
     <!-- Block: webfonts -->
     {% block fonts %}
       {% if config.extra.font != "none" %}
@@ -99,24 +114,10 @@
           href="https://fonts.googleapis.com/icon?family=Material+Icons" />
     {% endblock %}
 
-    <!-- Block: stylesheets -->
+    <!-- Custom stylesheets -->
-    {% block styles %}
+    {% for path in extra_css %}
-
+      <link rel="stylesheet" type="text/css" href="{{ path }}" />
-      <!-- Theme-related stylesheets -->
+    {% endfor %}
-      <link rel="stylesheet" type="text/css"
-          href="{{ base_url }}/assets/stylesheets/application.css" />
-
-      <!-- Extra color palette -->
-      {% if config.extra.palette %}
-        <link rel="stylesheet" type="text/css"
-            href="{{ base_url }}/assets/stylesheets/application.palette.css" />
-      {% endif %}
-
-      <!-- Custom stylesheets -->
-      {% for path in extra_css %}
-        <link rel="stylesheet" type="text/css" href="{{ path }}" />
-      {% endfor %}
-    {% endblock %}
 
     <!-- Block: custom front matter -->
     {% block extrahead %}{% endblock %}
@@ -220,11 +221,11 @@
               {% block content %}
 
                 <!--
-                  This is a nasty hack that checks whether the content contains
+                  Hack: check whether the content contains a h1 headline. If it
-                  a h1 headline. If it doesn't, the page title (or respectively
+                  doesn't, the page title (or respectively site name) is used
-                  site name) is used as the main headline.
+                  as the main headline.
                 -->
-                {% if not "\x3ch1 id=" in page.content %}
+                {% if not "\x3ch1" in page.content %}
                   <h1>{{ page.title | default(config.site_name, true)}}</h1>
                 {% endif %}
 
@@ -246,17 +247,7 @@
     {% block scripts %}
       <script src="{{ base_url }}/assets/javascripts/application.js"></script>
       <script>
-
+        app.initialize({ url: { base: "{{ base_url }}", } });
-        /* Configuration for application */
-        var config = {
-          url: {
-            base: "{{ base_url }}",
-          }
-        };
-
-        /* Initialize application */
-        var app = new Application(config);
-        app.initialize();
       </script>
       {% for path in extra_javascript %}
         <script src="{{ path }}"></script>

src/partials/nav-item.html

@@ -64,13 +64,13 @@
     <input class="md-toggle md-nav__toggle" data-md-toggle="toc"
         type="checkbox" id="toc" />
 
-    <!-- Nasty hack - see partials/toc.html for more information -->
+    <!-- Hack: see partials/toc.html for more information -->
-    {% if "\x3ch1 id=" in page.content %}
+    {% if toc_ | first is defined %}
       {% set toc_ = (toc_ | first).children %}
     {% endif %}
 
     <!-- Render table of contents, if not empty -->
-    {% if toc_ and (toc_ | first) %}
+    {% if toc_ | first is defined %}
       <label class="md-nav__link md-nav__link--active" for="toc">
         {{ nav_item.title }}
       </label>
@@ -81,7 +81,7 @@
     </a>
 
     <!-- Show table of contents -->
-    {% if page.toc %}
+    {% if toc_ | first is defined %}
       {% include "partials/toc.html" %}
     {% endif %}
   </li>

src/partials/toc.html

@@ -27,17 +27,17 @@
   {% set toc_ = page.toc %}
 
   <!--
-    This is a nasty hack that checks whether the content contains a h1
+    Hack: check whether the content contains a h1 headline. If it does, the
-    headline. If it does, the top-level anchor must be skipped, since it would
+    top-level anchor must be skipped, since it would be redundant to the link
-    be redundant to the link to the current page that is located just above the
+    to the current page that is located just above the anchor. Therefore we
-    anchor. Therefore we directly continue with the children of the anchor.
+    directly continue with the children of the anchor.
   -->
-  {% if "\x3ch1 id=" in page.content %}
+  {% if toc_ | first is defined and "\x3ch1 id=" in page.content %}
     {% set toc_ = (toc_ | first).children %}
   {% endif %}
 
   <!-- Render item list -->
-  {% if toc_ and (toc_ | first) %}
+  {% if toc_ | first is defined %}
     <label class="md-nav__title" for="toc">{{ lang.t('toc.title') }}</label>
     <ul class="md-nav__list" data-md-scrollfix>
       {% for toc_item in toc_ %}

tests/visual/.eslintrc

@@ -0,0 +1,8 @@
+{
+  "globals": {
+    "gemini": true
+  },
+  "rules": {
+    "no-loop-func": 0
+  }
+}