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hans-olo
The section with the red background is very bright -- it is difficult to read the text.

Please include examples of files cleaned with the tool.

rektide
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

ericb
I wrote a ruby gem that wraps the HTML tidy executable for local HTML validation. Disclaimer: It is vetted with the HTML 5 compatible tidy version, but I haven't tried it out with this new version yet. Pull requests welcome.

https://github.com/ericbeland/html_validation

martin-adams
The one thing I find missing on the site is, when would I use it? What benefit or problem is it solving?

Can anyone share when they've found this to be useful? For example, does it compress HTML for faster page loads, or fix invalid HTML (e.g. from wysiwyg editors).

bcg1
tidy is a swiss army knife for HTML and XML... it does the things you said and a lot more.

Pretty printing, switching encodings, conversions between HTML/XHTML, validation, removing those stupid quotation marks that MS Word litters all over the place in its vain attempt to ruin the universe... many annoying problems with HTML are easily solved with tidy

nilliams
It's mainly useful for 3rd party (or 'minified') HTML, just to make it readable. It's rare you'd want to use it on HTML you've written yourself.
jnellis
It comes from the early web when scraping web pages was a thing. Html is not always clean, missing end tags, cross nested tags, invalid tags, misused tags or you need xhtml/xml compatible html so you can do xpath/xslt on it.