SUMMARY I have discovered two sites to which the extension Readability is not able to apply its stylesheet. https://12bytes.org/tor-versus-a-vpn-which-is-right-for-you/ https://jtspratley.com/blog/my-favorite-falkon-web-browser-features STEPS TO REPRODUCE 1. Visit 12bytes.org or jtspratley.com 2. Star Readability OBSERVED RESULT Lack design. EXPECTED RESULT Complete design. SOFTWARE/OS VERSIONS Application version 24.08.3 QtWebEngine version 6.8.0 Arch Linux and Artix Linux ADDITIONAL INFORMATION To mitigate this issue, I have resorted to inline style. Please. See code from line of "const cssStyles = {};" https://greasyfork.org/en/scripts/465932-newspaper-html-feed-reader/code For pseudo CSS (i.e. hover), event listeners might be useful to solve this, albeit I did not try it yet. I sense that an elaborated solution (i.e. JS even listeners) might be required in the future. P.S. Eventually, Gemini and Gopher be the new standard.