In the data sent to us from the embedded iframe by postMessage(), the secret value is being used directly in a document.querySelectorAll() call without first being validated or escaped.
In theory, this could lead to some broken embeds.
Props mdawaffe.
Fixes#34831.
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Older versions of WordPress will convert those `&` characters to `&`, which makes for some non-functional JS. If folks are running an older release, let's not make their lives more difficult than it already is.
Props pento, peterwilsoncc.
See #34698.
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Sometimes, embedded sites might suffer from less than 100% uptime. Instead of leaving the embedding site with a big blank space where the embed should be, let's fall back to a link to the embedded post, so there's at least some context for the post.
Fixes#34462.
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