Text Layout Annoyances
The 100% Easy-2-Read Standard
CSS Font-Size: em vs. px vs. pt vs. percent
A chart of font sizes stated in points, pixels, ems, percent and keywords
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Tips und Tricks: 'em' nicht nur für Schriftgrößen
Use font-size: 100% !important
Vertical Text with CSS
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Archive:
https://web.archive.org/web/20171217145831/https://websemantics.uk/articles/font-size-conversion/