https://html.spec.whatwg.org/multipage/obsolete.html (if a feature is in the spec, it's safe to use, regardless of how much they beg you not to!)
To a time when i wrote my first lines of code, in Javascript, back in the 20th century. Always including language="JavaScript" (or "text/javascript", i don't remember which one i used first) so the browser would know that i did not mean something like Visual Basic, or whatever else was supported.
Oh. And using name attribute on anchors. And of course all this mess of pre-css pages. Doing weird crimes with tables and images to fake a rounded border.
