So font-size is an accessibility thing. In desktop browsers, you can scale your default font-size to better suit your needs. This can be an alternative to zooming. The idea is that sites can set their base font in rem to scale to the browser defaults. If a site wants to opt out (which they probably shouldn't), they can use a fixed font size like pixels.
Having to hack around this to scale your fonts a special way for Apple seems odd to me.
Either way, this is great information!
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