Note, the simplest way to "clear the state" is too pinch-zoom back out. As we don't currently allow zooming out past 100%, zooming out "as much as you can" will return you to 100% zoom. As far as having two independent zoom systems: as far as I'm aware, both Chrome and Safari have the same behaviour here.
Bug 1665439 Comment 2 Edit History
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Note, the simplest way to "clear the state" is to pinch-zoom back out. As we don't currently allow zooming out past 100%, zooming out "as much as you can" will return you to 100% zoom. As far as having two independent zoom systems: as far as I'm aware, both Chrome and Safari have the same behaviour here.