tidy-html5

I recently had an interesting conversation about the use of the HTML 4 transitional doctype, and was surprised to find out that it was no longer valid. I thought this website was the official / final say on the matter, but apparently it is both outdated and "just an informative reference", whatever that means: https://www.w3.org/QA/2002/04/valid-dtd-list.html This is true despite the fact that the best validator I know of, https://validator.w3.org/nu/, agreed this was a valid doctype. But apparently that was a mistake as well, and they recently fixed it so it shows that doctype as an error. So what does it mean for HTML to be versionless? Here is the best I can understand it. The doctype is not supposed to alter the way the browser behaves. Browsers should continue to support outdated elements, attributes, etc for backwards compatibility

Doesn't support tabs, can go DIAF. :-p Or jump in a lake, you downvoting sourpuss sissypants you! Recently went to check, after a >1 decade break. The man page is 5000 words, tons and tons and tons of options. No tabs though. Edit: apparently this feature got added last May! Just waiting on my distro now. Sweet! https://github.com/htacg/tidy-html5/issues/108