Dad-of-3. Developer Advocate at 
), PhD from 
), Postdoc at 
). 
Full credits to @matejlatin from whose article https://betterwebtype.com/articles/2019/06/16/5-keys-to-accessible-web-typography/ … I have learned this from. We just fixed this issue on http://v8.dev (pending deploy).
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#A11Y Tip: Don't set absolute font sizes! If someone has their default browser font size bumped up/down, you override their choice and force them to zoom. 
Instead, set the font size to `100%` on the `:root {}` level and make everything a function thereof via `em` or `rem`. 
pic.twitter.com/q455OUjHO8
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So, using 1.1 rem in the root is bad?
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By doing that, you override and upscale the user's chosen default font size, which typically is 16px, to 17.6px. You can do that, but maybe only above a certain screen size (or more hand-wavily: on "big" screens).
- Još 2 druga odgovora
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I understand the rest, but I'm a bit confused about this: what's the purpose of setting :root to 100%? Isn't that the default?
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It is the default, making it explicit mostly just makes sure you (or a CSS framework that you may include) don't set it to something else… ;-)
- Još 2 druga odgovora
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Can’t you use “rem” which is a relative value based on the browsers set font size?
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Yes, as long as you use `:root { font-size: 1rem; }`.
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Right. But this may cause content to overflow and you may get the ugly scrollbars
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If someone sets their default font size to very large, ugly scrollbars may be the least of their concerns…
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Oh wow so that's why we do that! Ty
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