I think the critical reason for me, why gumbo's mending is OK to leave on automatically, is that anything it changes -- even if it is something you didn't want -- will be changed to exactly the way a standards-compliant HTML5 rendering engine would interpret the malformed code anyway.
There is literally no way it can be worse than it was before. And the HTML5 parsing rules are pretty good about making the correct, reasonable call, so it is often the exact same change you would make yourself anyway.
Standards -- they're good for you.
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