Don't throw away information about the iframe src #733
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I didn't realize that the iframe src attribute was being dropped after the record-iframe changes. I also wasn't paying enough attention as would have thought that the function added in #592 would have preserved it by default.
I think as a general rule we shouldn't be dropping any attributes like this that are present in the source.
If this change was already in place, then #592 could have been conceived as a YouTube plugin that works at playback time.
Another thing this PR could enable would be displaying a placeholder box at playback time with the URL displayed within.