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[css-selectors-5]: move from :heading(<An+B>#) to :heading(<integer>#) #12634

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Aug 27, 2025
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[css-selectors-5]: move from :heading(<An+B>#) to :heading(<integer>#) #12634

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13 changes: 8 additions & 5 deletions selectors-5/Overview.bs
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Expand Up @@ -173,13 +173,16 @@ Heading Structures: the heading pseudo-classes '':heading'', and '':heading()''<

As a functional pseudo-class,
<dfn id='heading-functional-pseudo' lt=':heading()'>:heading()</dfn>
notation represents elements that have a <a>heading level</a> among <var>An+B</var>.
notation represents elements that have a <a>heading level</a> among matching
any of the provided <var>integer</var> values.
The syntax is:

<pre class=prod>
:heading() = :heading( <<An+B>># )
:heading() = :heading( <<level>># )
</pre>

where <dfn><code>&lt;level></code></dfn> is a <<number-token>> with its type flag set to "integer".

The [=specificity=] of '':heading()'' is that of a class.

<div class="example">
Expand All @@ -188,10 +191,10 @@ Heading Structures: the heading pseudo-classes '':heading'', and '':heading()''<
500, additionally heading levels 1 and 2 will be underlined, while 3 and
beyond will have no text-decoration:

<pre>:heading(-n+3) { font-weight: 900; }</pre>
<pre>:heading(n+6) { font-weight: 500; }</pre>
<pre>:heading(1, 2, 3) { font-weight: 900; }</pre>
<pre>:heading(6, 7, 8, 9) { font-weight: 500; }</pre>
<pre>:heading(1, 2) { text-decoration: underline; }</pre>
<pre>:heading(n+3) { text-decoration: none; }</pre>
<pre>:heading(3, 4, 5, 6, 7, 8, 9) { text-decoration: none; }</pre>
</div>

Note: The <a>heading level</a> might be different from an element's
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