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647 lines
19 KiB
Markdown
647 lines
19 KiB
Markdown
---
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status: new
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---
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# Setting up social cards
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Material for MkDocs can automatically create beautiful social cards for your
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documentation, which appear as link previews on social media platforms. You
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can select from several [pre-designed layouts][default layouts] or create
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[custom layouts] to match your unique style and branding.
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---
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:fontawesome-brands-youtube:{ style="color: #EE0F0F" }
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__[How to build custom social cards]__ by @james-willett – :octicons-clock-24:
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24m – Learn how to create entirely custom social cards perfectly matching your
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branding for each page automatically!
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[How to build custom social cards]: https://www.youtube.com/watch?v=4OjnOc6ftJ8
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<figure markdown>
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[![Layout default variant]][Layout default variant]
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<figcaption markdown>
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Social card of our [formatting] reference
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</figcaption>
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</figure>
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[default layouts]: ../plugins/social.md#layouts
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[custom layouts]: #customization
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[formatting]: ../reference/formatting.md
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[Layout default variant]: ../assets/screenshots/social-cards-variant.png
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## Configuration
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### Built-in social plugin
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<!-- md:version 8.5.0 -->
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<!-- md:plugin -->
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<!-- md:flag experimental -->
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The built-in social plugin automatically generate a custom preview image for
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each page. Install all [dependencies for image processing] and add the
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following lines to `mkdocs.yml`:
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``` yaml
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plugins:
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- social
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```
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For a list of all settings, please consult the [plugin documentation].
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[plugin documentation]: ../plugins/blog.md
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!!! info "The [`site_url`][site_url] setting must be set"
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Note that you must set [`site_url`][site_url] when using the social plugin,
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or the generated cards will not be correctly linked. Social media services
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like Twitter and Facebook demand that social previews point to an absolute
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URL, which the plugin can only compute when [`site_url`][site_url] is set.
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Example:
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``` yaml
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site_url: https://example.com
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```
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[dependencies for image processing]: ../plugins/requirements/image-processing.md
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[site_url]: https://www.mkdocs.org/user-guide/configuration/#site_url
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## Usage
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If you want to adjust the title or set a custom description for the social card,
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you can set the front matter [`title`][Changing the title] and
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[`description`][Changing the description] properties, which take precedence over
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the defaults, or use:
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- [`cards_layout_options.title`](../plugins/social.md#option.title)
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- [`cards_layout_options.description`](../plugins/social.md#option.description)
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[Changing the title]: ../reference/index.md#setting-the-page-title
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[Changing the description]: ../reference/index.md#setting-the-page-description
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### Choosing a font
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Some fonts do not contain CJK characters, like for example the
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[default font, `Roboto`][font]. In case your `site_name`, `site_description`, or
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page title contain CJK characters, choose another font from [Google Fonts] which
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comes with CJK characters, e.g. one from the `Noto Sans` font family:
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=== "Chinese (Simplified)"
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``` yaml
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plugins:
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- social:
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cards_layout_options:
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font_family: Noto Sans SC
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```
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=== "Chinese (Traditional)"
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``` yaml
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plugins:
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- social:
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cards_layout_options:
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font_family: Noto Sans TC
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```
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=== "Japanese"
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``` yaml
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plugins:
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- social:
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cards_layout_options:
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font_family: Noto Sans JP
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```
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=== "Korean"
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``` yaml
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plugins:
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- social:
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cards_layout_options:
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font_family: Noto Sans KR
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```
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[font]: changing-the-fonts.md#regular-font
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### Changing the layout
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<!-- md:version insiders-4.37.0 -->
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<!-- md:flag metadata -->
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<!-- md:flag experimental -->
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If you want to use a different layout for a single page (e.g. your landing
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page), you can use the `social` front matter property together with the
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[`cards_layout`](../plugins/social.md#meta.social.cards_layout) key, exactly as
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in `mkdocs.yml`:
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``` yaml
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---
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social:
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cards_layout: custom
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---
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# Page title
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...
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```
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You can apply those changes for entire subtrees of your documentation, e.g.,
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to generate different social cards for your blog and API reference, by using
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the [built-in meta plugin].
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[built-in meta plugin]: ../plugins/meta.md
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### Parametrizing the layout
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<!-- md:version insiders-4.37.0 -->
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<!-- md:flag metadata -->
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<!-- md:flag experimental -->
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Besides changing the entire layout, you can override all options that a layout
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exposes. This means you can parametrize social cards with custom front matter
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properties, such as `tags`, `date`, `author` or anything you can think of.
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Simply define [`cards_layout_options`](../plugins/social.md#meta.social.cards_layout_options):
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``` yaml
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---
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social:
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cards_layout_options:
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background_color: blue # Change background color
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background_image: null # Remove background image
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---
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# Page title
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...
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```
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You can apply those changes for entire subtrees of your documentation, e.g.,
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to generate different social cards for your blog and API reference, by using
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the [built-in meta plugin].
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### Disabling social cards
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<!-- md:version insiders-4.37.0 -->
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<!-- md:flag metadata -->
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<!-- md:flag experimental -->
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If you wish to disable social cards for a page, simply add the following to the
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front matter of the Markdown document:
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``` yaml
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---
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social:
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cards: false
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---
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# Page title
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...
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```
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## Customization
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<!-- md:sponsors -->
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<!-- md:version insiders-4.33.0 -->
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<!-- md:flag experimental -->
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[Insiders] ships a ground up rewrite of the [built-in social plugin] and
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introduces a brand new layout system based on a combination of YAML and
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[Jinja templates] – the same engine Material for MkDocs uses for HTML
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templating – allowing for the creation of complex custom layouts:
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<div class="mdx-social">
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<div class="mdx-social__layer">
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<div class="mdx-social__image">
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<span class="mdx-social__label">Layer 0</span>
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<img src="../../assets/screenshots/social-cards-layer-0.png" />
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</div>
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</div>
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<div class="mdx-social__layer">
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<div class="mdx-social__image">
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<span class="mdx-social__label">Layer 1</span>
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<img src="../../assets/screenshots/social-cards-layer-1.png" />
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</div>
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</div>
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<div class="mdx-social__layer">
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<div class="mdx-social__image">
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<span class="mdx-social__label">Layer 2</span>
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<img src="../../assets/screenshots/social-cards-layer-2.png" />
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</div>
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</div>
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<div class="mdx-social__layer">
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<div class="mdx-social__image">
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<span class="mdx-social__label">Layer 3</span>
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<img src="../../assets/screenshots/social-cards-layer-3.png" />
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</div>
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</div>
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<div class="mdx-social__layer">
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<div class="mdx-social__image">
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<span class="mdx-social__label">Layer 4</span>
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<img src="../../assets/screenshots/social-cards-layer-4.png" />
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</div>
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</div>
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<div class="mdx-social__layer">
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<div class="mdx-social__image">
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<span class="mdx-social__label">Layer 5</span>
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<img src="../../assets/screenshots/social-cards-layer-5.png" />
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</div>
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</div>
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</div>
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Social cards are composed of layers, analogous to how they are represented in
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graphic design software such as Adobe Photoshop. As many layers are common
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across the cards generated for each page (e.g., backgrounds or logos), the
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built-in social plugin can automatically deduplicate layers and render them
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just once, substantially accelerating card generation. The generated cards are
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cached to ensure they are only regenerated when their contents change.
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Layouts are written in YAML syntax. Before starting to create a custom layout,
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it is a good idea to [study the pre-designed layouts] (link to [Insiders]
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repository), in order to get a better understanding of how they work. Then,
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create a new layout and reference it in `mkdocs.yml`:
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=== ":octicons-file-code-16: `layouts/custom.yml`"
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``` yaml
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size: { width: 1200, height: 630 }
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layers: []
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```
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=== ":octicons-file-code-16: `mkdocs.yml`"
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``` yaml
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plugins:
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- social:
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cards_layout_dir: layouts
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cards_layout: custom
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debug: true
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```
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Note that the `.yml` file extension should be omitted. Next, run `mkdocs serve`,
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and see how the `.cache` directory is populated with the generated cards. Open
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any card in your editor, so you can see your changes immediately. Since we
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haven't defined any layers, the cards are transparent.
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The following sections explain how to create custom layouts.
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[Insiders]: ../insiders/index.md
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[built-in social plugin]: ../plugins/social.md
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[Google Fonts]: https://fonts.google.com/
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[Jinja templates]: https://jinja.palletsprojects.com/en/3.1.x/
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[study the pre-designed layouts]: https://github.com/squidfunk/mkdocs-material-insiders/tree/master/src/plugins/social/layouts
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### Size and offset
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Each layer has an associated size and offset, which is defined in pixels. The
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`size` is defined by a `width` and `height` property, and the `offset` by `x`
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and `y` properties:
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``` yaml
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size: { width: 1200, height: 630 }
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layers:
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- size: { width: 1200, height: 630 }
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offset: { x: 0, y: 0 }
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```
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If the `size` is omitted, it defaults to the size of the layout. If the `offset`
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is omitted, it defaults to the top left corner, which is the defaut `origin`.
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Saving the layout and reloading renders:
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![Layer size]
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The layer outline and grid are visible because we enabled [`debug`][debug]
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mode in `mkdocs.yml`. The top left shows the layer index and offset, which is
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useful for alignment and composition.
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[Layer size]: ../assets/screenshots/social-cards-layer-size.png
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[debug]: ../plugins/social.md#debugging
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#### Origin
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<!-- md:version insiders-4.35.0 -->
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<!-- md:flag experimental -->
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The `origin` for the `x` and `y` values can be changed, so that the layer is
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aligned to one of the edges or corners of the layout, e.g., to the bottom right
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corner of the layout:
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``` yaml hl_lines="5"
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size: { width: 1200, height: 630 }
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layers:
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- size: { width: 1200, height: 630 }
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offset: { x: 0, y: 0 }
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origin: end bottom
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```
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The following table shows the supported values:
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<figure markdown>
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| Origin | | |
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| -------------- | --------------- | ------------ |
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| :material-arrow-top-left: `start top` | :material-arrow-up: `center top` | :material-arrow-top-right: `end top` |
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| :material-arrow-left: `start center` | :material-circle-small: `center` | :material-arrow-right: `end center` |
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| :material-arrow-bottom-left: `start bottom` | :material-arrow-down: `center bottom` | :material-arrow-bottom-right: `end bottom` |
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<figcaption>
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Supported values for origin
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</figcaption>
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</figure>
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### Backgrounds
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Each layer can be assigned a background color and image. If both are given, the
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color is rendered on top of the image, allowing for semi-transparent, tinted
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backgrounds:
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=== "Background color"
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``` yaml
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size: { width: 1200, height: 630 }
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layers:
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- background:
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color: "#4051b5"
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```
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![Layer background color]
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=== "Background image"
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``` yaml
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size: { width: 1200, height: 630 }
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layers:
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- background:
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image: layouts/background.png
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```
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![Layer background image]
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=== "Background image, tinted"
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``` yaml
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size: { width: 1200, height: 630 }
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layers:
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- background:
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image: layouts/background.png
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color: "#4051b5ee" # (1)!
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```
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1. The color value can be set to a [CSS color keyword], or a 3, 4, 6 or 8
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letter HEX color code, allowing for semi-transparent layers.
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![Layer background]
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Background images are automatically scaled to fit the layer while preserving
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aspect-ratio. Notice how we omitted `size` and `offset`, because we want to
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fill the entire area of the social card.
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[Layer background color]: ../assets/screenshots/social-cards-layer-background-color.png
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[Layer background image]: ../assets/screenshots/social-cards-layer-background-image.png
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[Layer background]: ../assets/screenshots/social-cards-layer-background.png
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### Typography
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Now, we can add dynamic typography that is sourced from Markdown files - this is
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the actual raison d'être of the [built-in social plugin]. [Jinja templates] are
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used to render a text string that is then added to the image:
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``` yaml
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size: { width: 1200, height: 630 }
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layers:
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- size: { width: 832, height: 310 }
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offset: { x: 62, y: 160 }
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typography:
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content: "{{ page.title }}" # (1)!
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align: start
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color: white
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line:
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amount: 3
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height: 1.25
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font:
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family: Roboto
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style: Bold
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```
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1. The following variables can be used in [Jinja templates]:
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- [`config.*`][config variable]
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- [`page.*`][page variable]
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- [`layout.*`][layout options]
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The author is free in defining `layout.*` options, which can be used to pass
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arbitrary data to the layout from `mkdocs.yml`.
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This renders a text layer with the title of the page with a line height of 1.25,
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and a maximum number of 3 lines. The plugin automatically computes the font size
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from the line height, the number of lines, and font metrics like ascender and
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descender.[^2] This renders:
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[^2]:
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If the plugin would require the author to specify the font size and line
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height manually, it would be impossible to guarantee that the text fits
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into the layer. For this reason we implemented a declarative approach,
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where the author specifies the desired line height and number of lines, and
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the plugin computes the font size automatically.
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![Layer typography]
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[config variable]: https://www.mkdocs.org/dev-guide/themes/#config
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[page variable]: https://www.mkdocs.org/dev-guide/themes/#page
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[Layer typography]: ../assets/screenshots/social-cards-layer-typography.png
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#### Overflow
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If the text overflows the layer, there are two possible behaviors: either the
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text is automatically truncated and shortened with an ellipsis, or the text is
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automatically scaled down to fit the layer:
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``` { .markdown .no-copy }
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# If we use a very long headline, we can see how the text will be truncated
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```
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=== ":octicons-ellipsis-16: Ellipsis"
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![Layer typography ellipsis]
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=== ":material-arrow-collapse: Shrink"
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![Layer typography shrink]
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While truncating with an ellipsis is the default, auto-shrinking can be enabled
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by setting `overflow` to `shrink`:
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``` yaml hl_lines="7"
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size: { width: 1200, height: 630 }
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layers:
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- size: { width: 832, height: 310 }
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offset: { x: 62, y: 160 }
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typography:
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content: "{{ page.title }}"
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overflow: shrink
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align: start
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color: white
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line:
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amount: 3
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height: 1.25
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font:
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family: Roboto
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style: Bold
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```
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[Layer typography ellipsis]: ../assets/screenshots/social-cards-layer-typography-ellipsis.png
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[Layer typography shrink]: ../assets/screenshots/social-cards-layer-typography-shrink.png
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#### Alignment
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Text can be aligned to all corners and edges of the layer. For example, if we
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want to align the text to the middle of the layer, we can set `align` to `start center`, which will render as:
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![Layer typography align]
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[Layer typography align]: ../assets/screenshots/social-cards-layer-typography-align.png
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|
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The following table shows the supported values:
|
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|
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<figure markdown>
|
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|
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| Alignment | | |
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| -------------- | --------------- | ------------ |
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| :material-arrow-top-left: `start top` | :material-arrow-up: `center top` | :material-arrow-top-right: `end top` |
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| :material-arrow-left: `start center` | :material-circle-small: `center` | :material-arrow-right: `end center` |
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| :material-arrow-bottom-left: `start bottom` | :material-arrow-down: `center bottom` | :material-arrow-bottom-right: `end bottom` |
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<figcaption>
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Supported values for text alignment
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</figcaption>
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</figure>
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|
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#### Font
|
||
|
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The [built-in social plugin] integrates with [Google Fonts] and will
|
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automatically download the font files for you. The `font` property accepts a
|
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`family` and `style` property, where the `family` must be set to the name of the
|
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font, and the `style` to one of the supported font styles. For example, setting
|
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`family` to `Roboto` will automatically download the following files:
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|
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``` { .sh .no-copy #example }
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.cache/plugins/social/fonts
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└─ Roboto/
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├─ Black.ttf
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├─ Black Italic.ttf
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├─ Bold.ttf
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├─ Bold Italic.ttf
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├─ Italic.ttf
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├─ Light.ttf
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├─ Light Italic.ttf
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||
├─ Medium.ttf
|
||
├─ Medium Italic.ttf
|
||
├─ Regular.ttf
|
||
├─ Thin.ttf
|
||
└─ Thin Italic.ttf
|
||
```
|
||
|
||
In that case, the author can use `Bold` or `Medium Italic` as the `style`. If
|
||
the font style specified in the layer is not part of the font family, the
|
||
font always falls back to `Regular` and prints a warning in [`debug`][debug]
|
||
mode, as `Regular` is included with all font families.
|
||
|
||
### Icons
|
||
|
||
Authors can leverage the full range of icons that are shipped with Material for
|
||
MkDocs, or even provide custom icons by using theme extension and going through
|
||
the process described in the guide on [additional icons]. Icons can even be
|
||
tinted by using the `color` property:
|
||
|
||
``` yaml
|
||
size: { width: 1200, height: 630 }
|
||
layers:
|
||
- background:
|
||
color: "#4051b5"
|
||
- size: { width: 144, height: 144 }
|
||
offset: { x: 992, y: 64 }
|
||
icon:
|
||
value: material/cat
|
||
color: white
|
||
```
|
||
|
||
This will render the icon in the top right corner of the social card:
|
||
|
||
![Layer icon]
|
||
|
||
The possibilities are endless. For example, icons can be used to draw shapes
|
||
like circles:
|
||
|
||
``` yaml
|
||
size: { width: 1200, height: 630 }
|
||
layers:
|
||
- background:
|
||
color: "#4051b5"
|
||
- size: { width: 2400, height: 2400 }
|
||
offset: { x: -1024, y: 64 }
|
||
icon:
|
||
value: material/circle
|
||
color: "#5c6bc0"
|
||
- size: { width: 1800, height: 1800 }
|
||
offset: { x: 512, y: -1024 }
|
||
icon:
|
||
value: material/circle
|
||
color: "#3949ab"
|
||
```
|
||
|
||
This will add two circles to the background:
|
||
|
||
![Layer icon circles]
|
||
|
||
### Tags
|
||
|
||
The new [built-in social plugin] gives full flexibility of the meta tags that
|
||
are added to your site, which are necessary to instruct services like Twitter
|
||
or Discord how to display your social card. All default layouts use the following
|
||
set of tags, which you can copy to your layout and adapt:
|
||
|
||
``` yaml
|
||
definitions:
|
||
|
||
- &page_title_with_site_name >-
|
||
{%- if not page.is_homepage -%}
|
||
{{ page.meta.get("title", page.title) }} - {{ config.site_name }}
|
||
{%- else -%}
|
||
{{ page.meta.get("title", page.title) }}
|
||
{%- endif -%}
|
||
|
||
- &page_description >-
|
||
{{ page.meta.get("description", config.site_description) or "" }}
|
||
|
||
tags:
|
||
|
||
og:type: website
|
||
og:title: *page_title_with_site_name
|
||
og:description: *page_description
|
||
og:image: "{{ image.url }}"
|
||
og:image:type: "{{ image.type }}"
|
||
og:image:width: "{{ image.width }}"
|
||
og:image:height: "{{ image.height }}"
|
||
og:url: "{{ page.canonical_url }}"
|
||
|
||
twitter:card: summary_large_image
|
||
twitter.title: *page_title_with_site_name
|
||
twitter:description: *page_description
|
||
twitter:image: "{{ image.url }}"
|
||
```
|
||
|
||
Note that this examples makes use of [YAML anchors] to minify repetition. The
|
||
`definitions` property is solely intended for the definition on aliases that
|
||
can then be referenced with anchors.
|
||
|
||
[YAML anchors]: https://support.atlassian.com/bitbucket-cloud/docs/yaml-anchors/
|
||
|
||
__Are you missing something? Please [open a discussion] and let us know!__
|
||
|
||
[additional icons]: ./changing-the-logo-and-icons.md#additional-icons
|
||
[Layer icon]: ../assets/screenshots/social-cards-layer-icon.png
|
||
[Layer icon circles]: ../assets/screenshots/social-cards-layer-icon-circles.png
|
||
[open a discussion]: https://github.com/squidfunk/mkdocs-material/discussions/new
|