Felix Arntz 8505c99a1b Media: Enable lazy-loading of iframes by adding the loading="lazy" attribute to iframe tags on the front-end. ...

* Expands the capabilities of `wp_filter_content_tags()` to add the attribute to iframe tags if enabled.
* Modifies the default behavior of `wp_lazy_loading_enabled()` so that it returns `true` for `iframe` tags.
* Introduces a `wp_iframe_tag_add_loading_attr()` function.
* Introduces a `wp_iframe_tag_add_loading_attr` filter.

Like for images, the attribute is only added to iframes which have both `width` and `height` specified (see related #50367).

Props azaozz, flixos90, westonruter.
Fixes #50756.


git-svn-id: https://develop.svn.wordpress.org/trunk@49808 602fd350-edb4-49c9-b593-d223f7449a82

2020-12-16 21:17:24 +00:00

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Media: Enable lazy-loading of iframes by adding the loading="lazy" attribute to iframe tags on the front-end.

2020-12-16 21:17:24 +00:00

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