Returns invalid attributes in tr/td elements

[Trott]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)

Affected packages and versions

remark-gfm@3.0.1

Link to runnable example

No response

Steps to reproduce

Run the example.js file in the README with the example.md in the README as input.

Expected behavior

Output should match the output shown in the README.

Actual behavior

The output for the table has align="none" attribute showing up. This appears to be an interoperability issue between rehypeStringify and remark-gfm (and really the underlying micromark-extension-gfm-table and hast-util-to-html modules).

align="none" is not valid, or at least that's my reading of https://developer.mozilla.org/en-US/docs/Web/HTML/Element/td#attr-align. Regardless, align is deprecated and I think the right thing to do here is omit it (which is what the example output does).

Here's the output I get:

<h1>GFM</h1>
<h2>Autolink literals</h2>
<p><a href="http://www.example.com">www.example.com</a>, <a href="https://example.com">https://example.com</a>, and <a href="mailto:contact@example.com">contact@example.com</a>.</p>
<h2>Footnote</h2>
<p>A note<sup><a href="#user-content-fn-1" id="user-content-fnref-1" data-footnote-ref aria-describedby="footnote-label">1</a></sup></p>
<h2>Strikethrough</h2>
<p><del>one</del> or <del>two</del> tildes.</p>
<h2>Table</h2>
<table>
<thead>
<tr>
<th align="none">a</th>
<th align="left">b</th>
<th align="right">c</th>
<th align="center">d</th>
</tr>
</thead>
</table>
<h2>Tasklist</h2>
<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" disabled> to do</li>
<li class="task-list-item"><input type="checkbox" checked disabled> done</li>
</ul>
<section data-footnotes class="footnotes"><h2 id="footnote-label" class="sr-only">Footnotes</h2>
<ol>
<li id="user-content-fn-1">
<p>Big note. <a href="#user-content-fnref-1" data-footnote-backref class="data-footnote-backref" aria-label="Back to content">↩</a></p>
</li>
</ol>
</section>

Runtime

Node v17

Package manager

npm v7

OS

macOS

Build and bundle tools

No response

[wooorm]

Presumably a mistake I made before leaving for holiday last week. Will try to solve it tomorrow. Thanks for raising!

[wooorm]

Something which I assumed was internal was leaking and causing this error. Fixed!