Normalize HTML tag whitespace/indentation/newline formatting

[lgarron]

Biome seems to apply itself to HTML files by default now, so I took another look at the formatter. I don't consider it ready to use yet, as it does not modify the following:

<div >Hello!</div>

This kind of text can be left behind when e.g. removing the sole remaining attribute of an element:

<div class="foo">Hello!</div>

Similar can happen when shuffling around attributes and changing newlines inside the tag (but not inside an attribute).

I would expect Biome to pick some sort of canonical choice to format tags like this (similar to, say, js-beautify — the default HTML formatter that ships with into VS Code).

[siketyan]

Biome does remove the unnecessary whitespace: https://biomejs.dev/playground/?code=PABkAGkAdgAgAD4ASABlAGwAbABvACEAPAAvAGQAaQB2AD4A&language=html. Do you have a reproduction? It sounds like a bug.

[ematipico]

I don't consider it ready to use yet

And neither do we, in fact it's documented as still experimental and that's why it's opt-in

[lgarron]

I think I understand what's going on now. HTML lints are now opt-out, but the formatter is opt-in? #9209

This was not at all intuitive to me after doing a version bump. The experience certainly seemed like buggy behaviour. 😬

I do see the release notes go by, but
https://github.com/biomejs/biome/releases/tag/%40biomejs%2Fbiome%402.4.0 does not mention anything about (only) the accessibility rules being enabled for HTML by default. I'm finding out that detail from https://biomejs.dev/blog/biome-v2-4/#html-accessibility-rules just now.