Pixels vs. Relative Units in CSS: why it’s still a big deal
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Remember, users really do change their settings under the hood, and we should be maintaining users’ control over their own browsing experience. If you use relative CSS units for your typography styles, you can maintain the fidelity of your layouts without negatively impacting the needs of your users.
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older link:
3 Methods for Scoped Styles in Web Components That Work Everywhere -
newer link:
Testing the Web Share API