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FF126 Relnote: CustomStateSet and CSS :state() selector #33098

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Apr 22, 2024
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FF126 Relnote: CustomStateSet and CSS :state() selector #33098

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FF126 Relnote: CustomStateSet and CSS :state() selector
hamishwillee Apr 15, 2024
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hamishwillee Apr 22, 2024
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42 changes: 0 additions & 42 deletions files/en-us/mozilla/firefox/experimental_features/index.md
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Expand Up @@ -1785,48 +1785,6 @@ The `GeometryUtils` method `getBoxQuads()` returns the CSS boxes for a {{domxref
</tbody>
</table>

#### CustomStateSet and the :state() pseudo-class: States for custom elements

You can now define custom states for custom elements and match them using CSS.
Custom states are represented as custom identifiers that can be added to, or removed from, the element's {{domxref("ElementInternals.states")}} property (a {{domxref("CustomStateSet")}}). The CSS [`:state()`](/en-US/docs/Web/CSS/:state) pseudo-class takes a custom identifier as an argument and matches the custom elements if the identifier is present in their set of states.
(See [Firefox bug 1861466](https://bugzil.la/1861466) and [Firefox bug 1866351](https://bugzil.la/1866351) for more details.)

<table>
<thead>
<tr>
<th>Release channel</th>
<th>Version added</th>
<th>Enabled by default?</th>
</tr>
</thead>
<tbody>
<tr>
<th>Nightly</th>
<td>121</td>
<td>No</td>
</tr>
<tr>
<th>Developer Edition</th>
<td>121</td>
<td>No</td>
</tr>
<tr>
<th>Beta</th>
<td>121</td>
<td>No</td>
</tr>
<tr>
<th>Release</th>
<td>121</td>
<td>No</td>
</tr>
<tr>
<th>Preference name</th>
<td colspan="2"><code>dom.element.customstateset.enabled</code></td>
</tr>
</tbody>
</table>

### Payment Request API

#### Primary payment handling
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3 changes: 3 additions & 0 deletions files/en-us/mozilla/firefox/releases/126/index.md
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Expand Up @@ -40,6 +40,9 @@ This article provides information about the changes in Firefox 126 that affect d

#### DOM

- States can now be defined for custom elements and matched using CSS selectors.
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The custom states are represented as custom identifiers that can be added to, or removed from, the element's {{domxref("ElementInternals.states")}} property (a {{domxref("CustomStateSet")}}). The CSS [`:state()`](/en-US/docs/Web/CSS/:state) pseudo-class takes a custom identifier as an argument and matches custom elements if the identifier is present in their set of states. ([Firefox bug 1861466](https://bugzil.la/1861466), [Firefox bug 1866351](https://bugzil.la/1866351), [Firefox bug 1887543](https://bugzil.la/1887543).)
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#### Media, WebRTC, and Web Audio

#### Removals
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