This ensures that a standard header is shown on the front page whenever
a header video is set without a header image if the video doesn't load,
e.g., on mobile sizes or if the JS doesn't fire.
This adds a new class, `.has-header-video` that is added whenever the
`wp-custom-header-video-loaded` event is fired, which is then used to style
the custom headers along with `.has-header-image` whenever a header image
is available. This also changes the class name on the custom header media
wrapping `div` from `.custom-header-image` to `.custom-header-media`.
Props laurelfulford, joemcgill.
Fixes#38995.
Built from https://develop.svn.wordpress.org/trunk@39413
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* Use `postMessage` transport for header image settings by default when video headers are supported, and thus `the_custom_header_markup()` will necessarily be used (and thus a selective refresh partial will be available).
* Ensure that `the_custom_header_markup()` always outputs a container element in the customizer preview even if the header is empty.
* Ensure that edit shortcut appearing for custom header does not get positioned off-screen.
Props bradyvercher, westonruter.
See #38639.
Fixes#38737.
Built from https://develop.svn.wordpress.org/trunk@39227
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This adds the ability for themes to add support for videos in custom headers
by passing `'video' => true` as an argument when adding theme support for
custom headers.
Custom video headers are managed through the “Header Visuals” (i.e. “Header Image”)
panel in the Customizer where you can select a video from the media library or set a
URL to an external video (YouTube for now) for use in custom headers.
This introduces several new functions:
`has_header_video()` – Check whether a header video is set or not.
`get_header_video_url()` – Retrieve header video URL for custom header.
`the_header_video_url()` – Display header video URL.
`get_header_video_settings()` – Retrieve header video settings.
`has_custom_header()` – Check whether a custom header is set or not.
`get_custom_header_markup()` – Retrieve the markup for a custom header.
`the_custom_header_markup()` – Print the markup for a custom header.
And a new file, `wp-includes/js/wp-custom-header.js` that handles loading videos
in custom headers.
This also enables video headers in the Twenty Seventeen and Twenty Fourteen themes.
Props davidakennedy, celloexpressions, bradyvercher, laurelfulford, joemcgill.
Fixes#38172.
Built from https://develop.svn.wordpress.org/trunk@38985
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