A technique for a rounded tabs where the top corners are rounded, but also the bottom corners are rounded where they attach to the content area. "Round out" or "flared" borders, if you will.| CSS-Tricks
The CSS shape() function recently gained support in both Chromium and WebKit browsers. It's a way of drawing complex shapes when clipping elements with the clip-path property.| CSS-Tricks
A few lines of code to get rounded tabs using CSS mask| css-tip.com
Did something similar with `arc` instead of `curve` https://codepen.io/thebabydino/pen/azOgOKE `arc` is already supported in Firefox behind a flag. While `curve` isn't, but the `@supports` test with a `curve` path still passes, so then it doesn't even use the fallback.| Bluesky Social
Accessibility resources free online from the international standards organization: W3C Web Accessibility Initiative (WAI).| Web Accessibility Initiative (WAI)