* Prevent loading `wp-embed` script unconditionally on every page in favor of conditionally enqueueing when a post embed is detected. The `wp-embed` script is also explicitly marked as being in the footer group. Sites which currently disable post embed scripts from being enqueued via `remove_action( 'wp_head', 'wp_oembed_add_host_js' )` will continue to do so.
* Send a `ready` message from the host page to each post embed window in case the `iframe` loads before the `wp-embed` script does. When the `ready` message is received by the post embed window, it sends the same `height` message as it sends when it loads.
* Eliminate use of `grunt-include` to inject emoji script and the post embed script. Instead obtain the script contents via `file_get_contents()` (as is done elsewhere in core) and utilize `wp_print_inline_script_tag()`/`wp_get_inline_script_tag()` to construct out the script. This simplifies the logic and allows the running of src without `SCRIPT_DEBUG` enabled.
* For the embed code that users are provided to copy for embedding outside of WP, add the `secret` on the `blockquote` and `iframe`. This ensures the `blockquote` will be hidden when the `iframe` loads. The embed code in question is accessed here via `get_post_embed_html()`.
Props westonruter, swissspidy, pento, flixos90, ocean90.
Fixes#44632, #44306.
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This ensures that Ctrl/Cmd + click to open a link in the embed iframe in a new tab works as expected.
Props timhavinga, garrett-eclipse, smerriman, swissspidy, johnbillion, Mte90, iandunn, azaozz, afercia, audrasjb, SergeyBiryukov.
Fixes#39097.
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These annotations make it clear to the reader of a JavaScript source
where the build process outputs to. These annotations can later be
integrated in a webpack configuration. This way there is one source of
truth.
The `build` folder is omitted from the paths, because a single JS file
shouldn't not be responsible of knowing where outputs in general will
end up at. A file only knows its output location relative to the
project.
Props adamsilverstein, herregroen, omarreiss, pento.
Fixes#44361.
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When the featured image takes longer to load, the browser might not know its exact dimensions yet and therefore sends an incorrect document height to the embedding site.
By sending the document's height again after the featured image has been loaded, we ensure that the iframe doesn't get cut off.
Fixes#35657.
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