That message was mostly leftover from the old days when Sigil used HTML Tidy and it would occasionally mess up.
Modern versions of Sigil use the gumbo parser that autorepairs following the exact same rules as major browsers like Safari, Edge, Chrome, Firefox.
Sigil has git checkpointing built in. So before making any change simply run Checkpoint so that you can see the diffs of what changed and even revert to an earlier checkpoint if you so desire.
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