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Joe McGill 744f87dbb3 Themes: Enable video in custom headers.
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.

git-svn-id: https://develop.svn.wordpress.org/trunk@38985 602fd350-edb4-49c9-b593-d223f7449a82
2016-10-27 21:50:56 +00:00
src Themes: Enable video in custom headers. 2016-10-27 21:50:56 +00:00
tests REST API: Return WP_Error when a client is attempting to update an option with a non-scalar value to null. 2016-10-27 16:07:06 +00:00
tools/i18n DOCS: Replace HTTP links with HTTPS. 2016-06-10 04:49:09 +00:00
.editorconfig Use HTTPS URLs for codex.wordpress.org. 2015-04-12 21:28:58 +00:00
.gitignore Revert [38401] after [38480]. 2016-09-06 18:12:09 +00:00
.jshintrc Build: Prevent non-breaking spaces from accidentally being inserted into JavaScript files. 2015-11-12 12:04:55 +00:00
.travis.yml Build/Test Tools: Ensure PHP 7.1 is tested on Travis. 2016-08-17 20:45:07 +00:00
Gruntfile.js Build/Test Tools: Allow Minimal Builds 2016-10-20 22:23:21 +00:00
package.json Build/Test: Bump Autoprefixer to 6.5.0 2016-09-30 17:33:57 +00:00
phpunit.xml.dist oEmbed: Remove the oEmbed provider unit tests. 2016-10-20 09:15:10 +00:00
wp-cli.yml Remove debug mode from WP-CLI by default, as it now outputs too much debugging information to be of use during normal development. 2015-11-28 18:36:06 +00:00
wp-config-sample.php Lightly clean up and improve inline documentation in wp-config-sample.php. 2015-05-10 00:05:30 +00:00
wp-tests-config-sample.php Tests: Use a minimal theme for tests. 2016-10-21 11:02:37 +00:00