Not all HTML is preserved, when the editors toggle it tries to convert as much as it can into markdown. For this kind of stuff it is better to stick to just one editor otherwise it will keep trying to convert it.
Also your best bet is to clip it with the webclipper rather than copy it as that will preserve as much as it can. If you clip it as HTML then it will mark it as an HTML page and wont attempt to convert at all but that does mean that the markdown editor will pretty much just show raw html if you try to edit it.

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