https://www.alwaystwisted.com/articles/styling-with-the-heading-pseudo-class
Style Headings using the CSS :heading pseudo-class | Always Twisted
Feb 16, 2026 - Use the :heading pseudo-class to style all headings (h1-h6) with a single CSS rule. Reduce repetition in design systems and component libraries while...
pseudo classalways twistedcss
https://lea.verou.me/demos/nth.html
CSS3 structural pseudo-class selector tester
pseudo classstructuraltester