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[selectors-5]: Update heading specs based on resolutions in #10296 #12404

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merged 2 commits into from
Jun 27, 2025
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[selectors-5]: Update heading specs based on resolutions in #10296 #12404

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88fd8e2
[selectors-5]: allow :heading() to have An+B comma separated values
keithamus Jun 27, 2025
018a3ff
[selectors-5]: Provide guidance on specificity of :heading/:heading()
keithamus Jun 27, 2025
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16 changes: 14 additions & 2 deletions selectors-5/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -162,6 +162,8 @@ Heading Structures: the heading pseudo-classes '':heading'', and '':heading()''<
matches an element which has a <a>heading level</a>, with respect to the
semantics defined by the document language (e.g. [[HTML5]]).

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

<div class="example">
For example, the following sheet contains a rule applying to all heading
elements in the current page:
Expand All @@ -170,16 +172,26 @@ Heading Structures: the heading pseudo-classes '':heading'', and '':heading()''<
</div>

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

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

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

<div class="example">
The following example styles headings with levels between 1 and 3 with a
font-weight of 900, while headings with levels 6 onward with font-weight of
500:
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) { text-decoration: underline; }</pre>
<pre>:heading(n+3) { text-decoration: none; }</pre>
</div>

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