Don't modify headers or dt if the tag is manually written HTML #2913
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This changes it so that header and
<dt>tags manually written as HTML are not modified (no anchor, no id, etc.). This is to avoid mangling any HTML that the user explicitly crafted.I'm not sure what the fallout from the headers might be, since I'm not 100% sure there aren't uses where the user wanted mdbook to modify manual HTML. However, I don't see any in rust-lang's use.