add id attr directly in heading if possible #60
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Instead of generating a useless before the relevant
<h?> tag, just add the id attr to the <h?> tag if it does not have
one already.
This way, the target of the link is exactly the <h?> tag, and the
browser positions the focus exactly on it. Without this, there was a
slight difference in offset between tags which had an id= attr an
tags which didn't.