By 'user' I do mean the user tables in the database. If its happened in the last week then you are going to have to examine what has changed since then, i.e. any files / plugins updated / added etc. and I disagree with 'I suspect that this was always the case and the browsers we use just decided to be stricter about it', this is an 'output' issue as the tag should not be there in the first place.
Themes
Moodle Messing Up Layout with Scattered Tags
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