The WHATWG is actually the only organization I know of that publishers a developer-focused specification; see https://html.spec.whatwg.org/dev/ https://html.spe

The WHATWG is actually the only organization I know of that publishers a developer-focused specification; see https://html.spec.whatwg.org/dev/ https://html.spec.whatwg.org/dev/. (We only do it for HTML currently.) Anyway, I agree with the grandparent poster that caniuse.com is a much better approach to documenting the interoperable subset than copying and pasting someone else's spec, and trying to delete the parts that are not interoperable by some threshold. We actually have caniuse.com boxes in the margin of the HTML Standard: see for example https://html.spec.whatwg.org/multipage/scripting.html#attr-script-type https://html.spec.whatwg.org/multipage/scripting.html#attr-s... Finally, it's worth noting that we only incorporate features into WHATWG Living Standards if they have multiple implementer interest; see https://whatwg.org/working-mode#additions https://whatwg.org/working-mode#additions