fix: let indented and type 3-5 html blocks interrupt a paragraph

[kevin9327]

Marked version: 18.0.14 (c18a64f)

Markdown flavor: CommonMark|GitHub Flavored Markdown

Description

CommonMark lets every HTML block type except 7 interrupt a paragraph, with up to three spaces of indentation like the other block starts. The html part of marked's paragraph interrupt only covers type 6 tags, <script|pre|style|textarea and <!--, and it has no indentation allowance, so two kinds of input end up as paragraph text instead of starting an HTML block.

Expectation

Some text
  <div>
*raw*
</div>

<p>Some text</p>
  <div>
*raw*
</div>

and likewise for <?php ... ?>, <!DOCTYPE html> and <![CDATA[ ... ]]> right after a paragraph line (types 3, 4 and 5). This is what commonmark.js produces.

Result

<p>Some text
  <div>
<em>raw</em>
</div></p>

The PI, declaration and CDATA lines are folded into the paragraph the same way.

What was attempted

Found while diffing marked (gfm: false) against commonmark.js on generated inputs.

The fix adds {0,3} and the type 3 to 5 start conditions to the html interrupt in the paragraph rules (CommonMark and GFM) and the GFM table rows, and adds the same start conditions to htmlBeginRegex, which the comment says mirrors the paragraph rule and is used to end list items. The html block rule itself already handles all of these once it gets a chance to run.

#4114 edits the same <(?:script|pre|style|textarea|!--) fragment for a different issue (whole tag names), so whichever lands second will need a small rebase.

Contributor

• Test(s) exist to ensure functionality and minimize regression: test/specs/new/html_block_interrupts_paragraph fails before the change and passes after. Spec and unit tests pass locally.
• no tests required for this PR.
• If submitting new feature, it has been documented in the appropriate places.

Committer

In most cases, this should be a different person than the contributor.

• CI is green (no forced merge required).
• Squash and Merge PR following conventional commit guidelines.

[vercel]

@kevin9327 is attempting to deploy a commit to the MarkedJS Team on Vercel.

A member of the Team first needs to authorize it.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
marked-website	Ready	Preview	Oct 9, 2026 3:02am UTC

[UziTech]

Thanks! 💯

[kevin9327]

Thanks for the review!

[styfle]

Thanks!

[UziTech]

Please fix the merge conflicts