Inconsistent white space handling in HTML quoted attribute values?

[seiyab]

I found html-flow preserves white spaces at starts of lines in HTML quoted attribute values but html-text doesn't.
Why are they differ? If it's a bug, I'd like html-text to preserve such whitespaces.
Adding context, Prettier is trying to upgrade Markdown parser but the current behavior looks to change the format and it's hard to find workarounds. Prettier utilizes mdast-util-from-markdown and prints nodes' value for html nodes. With the latest micromark, such spaces are removed from formatted output.

import { micromark } from 'micromark';
import assert from 'node:assert/strict';

const opts = { allowDangerousHtml: true };

console.log(
  micromark('<unknown class="abc\n    def\nghi">abc</unknown>', opts),
);

console.log(
  micromark('<div class="abc\n    def\nghi">abc</div>', opts),
);

<p><unknown class="abc
 def
ghi">abc</unknown></p>
<div class="abc
    def
ghi">abc</div>

[remcohaszing]

I don’t know why this is, but this behaviour seems to match commonmark.

[seiyab]

Thank you for the information. A commonmark member confirmed it's a bug.
commonmark/commonmark.js#303

[wooorm]

I don’t think it’s a bug per se, it is because how paragraphs can be arbitrarily indented