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Welllllll, actually….
There is no requirement for anything to be in the title tags…. Just that you have a title tag.
Originally html documents were not designed to be zipped up and put in a book…
When multi-tabbed browsers were introduced they would use the contents of the title tag in the tab, but otherwise most readers/devices/apps completely ignore the contents of the title tag.
There is nothing wrong with putting chapter names in there, it’s just largely irrelevant.
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