Please be aware that various aspects of the design are not compatible with zooming in (to compensate for the reduction). Contextual menus separated from context (screenshot below), misplacement of images (thumbnail below), and so on.
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Postscript
I can learn the Safari keyboard shortcut to switch on, switch off
Zoom Text Only but from past experience with that option I suspect that throwing of the switch, one way or the other, will be frequent. The effect can be weird.
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It would be better to not have the UI glitches (the contextual menu and so on).