[6.x] Only load video embed when field becomes visible #13527
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This pull request ensures that video embeds are only loaded when the field becomes visible, rather than when the page loads.
We can't just use
loading="lazy"because it would load the iframes for video fields in collapsed Replicator sets, so I've had to use an intersection observer to detect when the embed element is actually visible (eg. nodisplay: noneon parent elements).Related: #13385