Splits wp-includes/embed-template.php, introduced in 4.4, into five new templates that can be individually overridden by themes:
* embed.php
* embed-404.php
* embed-content.php
* header-embed.php
* footer-embed.php
Also introduces a new template tag for outputting the site title, `the_embed_site_title()`.
The five new templates live in theme-compat, allowing for graceful fallbacks should themes prefer not to override any or all of them.
Props swissspidy, imath, ocean90, DrewAPicture.
See #34561.
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In [36338], a template loading error was shown only to users with the `install_themes` capability. This is now displayed users with the `switch_themes` capability, as users with this cap can at least switch to a different theme. Also, this will now show for site administrators in multisite, whereas `install_themes` is limited to superadmins.
Props dd32.
See #21931.
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After [36335], if a template file is not loaded, an error is displayed
to logged-in users. As logged-in users may have no capabilities,
this check is insubstantial. Limit the display of this error to users
with the `install_themes` capability, i.e. someone who has the capacity
to deal with the error.
See #21931.
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On the off-chance the active theme folder is renamed or deleted, a "white screen
of death" was displayed to the user. Instead, the user is shown a useful error
screen displaying any errors the theme has (e.g. if the theme can't be found).
Props MikeHansenMe, SergeyBiryukov.
See #21931.
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Twelve years later, after no fewer than three themes have intentionally implemented popup comments in their functionality, before being abandoned for at least the last six years, we've reached a time where we can put this era behind us. A time when we can remove comment popup functionality from WordPress.
If this breaks the internet, I'll eat my hat.
Fixes#28617
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For the past 6 years, WordPress has operated as an oEmbed consumer, allowing users to easily embed content from other sites. By adding oEmbed provider support, this allows any oEmbed consumer to embed posts from WordPress sites.
In addition to creating an oEmbed provider, WordPress' oEmbed consumer code has been enhanced to work with any site that provides oEmbed data (as long as it matches some strict security rules), and provides a preview from within the post editor.
For security, embeds appear within a sandboxed iframe - the iframe content is a template that can be styled or replaced entirely by the theme on the provider site.
Props swissspidy, pento, melchoyce, netweb, pfefferle, johnbillion, extendwings, davidbinda, danielbachhuber, SergeyBiryukov, afercia
Fixes#32522.
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* Content doesn't make sense for HEAD requests
* Saves wear and tear on the server
* Introduces a filter: exit_on_http_head (we send TRUE through it)
fixes#14348. props mbijon, mitchoyoshitaka.
git-svn-id: http://core.svn.wordpress.org/trunk@22347 1a063a9b-81f0-0310-95a4-ce76da25c4cd
