[css-writing-modes] unicode-bidi: plaintext not affect ul/ol #3491

This spec in w3.org: https://www.w3.org/TR/css-writing-modes-3/

When I set unicode-bidi to plaintext, direction should be set automatically. But on ul and ol tags, It not works.

The example is:

<ul style="unicode-bidi:plaintext">
<li>سلام</li>
<li>آزمایش</li>
</ul>

<ol style="unicode-bidi:plaintext">
<li>سلام</li>
<li>آزمایش</li>
</ol>