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The node cloning step in the AAA still reads from the live DOM. (It reads script-mutated attributes.) This is bad for off-the-main-thread parsing. Please change the spec so that: 1) The items on the list of open formatting elements remember the start tag token associated with the items. 2) Instead of shallow-cloning an existing node, create a new element for the token on the list.
Done. This also affected reconstructing the formatting elements.