Weston Ruter

This plugin adds the <code>loading=lazy</code> attribute to <code>iframe</code> elements coming from oEmbeds. In WordPress 5.5, <code>loading=lazy</code> is added to images per <a href="https://core.trac.wordpress.org/ticket/44427" rel="nofollow ugc">#44427</a>, and in 5.7 it is being added to iframes as well per <a href="https://core.trac.wordpress.org/ticket/50756" rel="nofollow ugc">#50756</a>.
This plugin will be obsolete by the time WordPress 5.7 is released. When that happens, this plugin will do nothing.

Lazy Loading oEmbed Iframes

Add the loading=lazy attribute to iframes coming from oEmbeds in content

lenasterg

Adds oEmbed support in WordPress posts, pages and custom post types for videos from https://video.sch.gr, school location map from https://maps.sch.gr sites of Greek Schools Network. 
There are no settings. Simply, add the URL in your content editor. 
For video embedding from https://video.sch.gr: Just paste the given “Απευθείας σύνδεσμος” link from the “Κοινοποίηση” section of a video from video.sch.gr into the content area and it will by transformed to oEmbed into your post, page or custom post type. 
* Example video: Copy https://video.sch.gr/asset/detail/n1rDHZIL7FEdoctIUjzKzPuS/t2NkiLSvRHDiSNaTtSVm2Dh6 and paste it into your post. 
* Example slideshow: Copy http://lterz.mmpres.sch.gr:4000/popcorn/1h and paste it into your post.
For school location map from https://maps.sch.gr: Find the school you want at https://maps.sch.gr. Right click on the marker and copy the text from the “Αντιγραφή συνδέσμου” textbox. Go into your WordPress post/page editor and paste the URL in a separate line. Publish the post/page and the map will be embedded.

Sch.gr Commons

Just copy/paste a URL of video from https://video.sch.gr, or a school location map from https://maps.sch.gr into your WordPress posts and see them emb …

Lazy Loading oEmbed Iframes vs Sch.gr Commons