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- Must not rewind and reparse with different rules.
- It should be possible to have the string <!-- in xmp without having the rest of the page eaten up into xmp element.
- It should be possible to have <!-- near the start of a script or style element without having a matching --> and still the trailing part of the page shouldn't get eaten up into the script or style element.
- Pages authored naively for HTML5-parsing-enabled UAs shouldn't be XSS risks in legacy UAs.
- When the author uses comment-like syntax in the fallback markup in iframe, noembed or noframes, the comment-like syntax should span the same character run that it would if it were parsed as markup.