Line length revisited: following the research
The consensus among typographers is that we should avoid long line lengths when designing continuous texts. Also, line spacing should be greater with longer lines.
Modern CSS Techniques To Improve Legibility
Modern CSS has numerous tools to help you improve the legibility of your text, from cutting edge technologies like variable fonts, to newly precise control of established properties. Edoardo Cavazza introduces some of his favorite tricks, with plenty of actionable tips for implementing them on your own sites.
Pixels vs. Relative Units in CSS: why it’s still a big deal
The most important reason for using responsive and unitless values in our CSS is for supporting our users that rely on zooming. If you read the Web Content Accessibility Guidelines, our users need to be able to zoom the viewport without loss of content or functionality, or restrictions imposed by CSS values or viewport scaling settings.