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FF149 Relnote - allow more chars in DOM names/namespaces for elem/attribute methods #43392

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pepelsbey merged 3 commits into from
Mar 13, 2026
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FF149 Relnote - allow more chars in DOM names/namespaces for elem/attribute methods #43392

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FF149 Relnote - allow more chars in DOM names/namespaces for elem/att…
hamishwillee Mar 10, 2026
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improve release note
hamishwillee Mar 10, 2026
85de84c
Update files/en-us/mozilla/firefox/releases/149/index.md
hamishwillee Mar 13, 2026
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5 changes: 5 additions & 0 deletions files/en-us/mozilla/firefox/releases/149/index.md
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Expand Up @@ -60,6 +60,11 @@ Firefox 149 is the current [Beta version of Firefox](https://www.firefox.com/en-
This allows developers to implement components that can be closed using device-native mechanisms, such as the <kbd>Esc</kbd> on Windows or the <kbd>Back</kbd> key on Android, in the same way as built-in components such as [dialogs](/en-US/docs/Web/HTML/Reference/Elements/dialog) and [popovers](/en-US/docs/Web/API/Popover_API).
([Firefox bug 1966073](https://bugzil.la/1966073)).

- DOM methods now allow wider range of characters for element and attribute names.
Previously, DOM methods were far more restrictive, but now they allow the same set of characters as the HTML parser.
The affected methods are: {{domxref("Document/createAttribute","createAttribute()")}}, {{domxref("Document/createAttributeNS","createAttributeNS()")}}, {{domxref("Document/createElement","createElement()")}} and {{domxref("Document/createElementNS","createElementNS()")}} of the {{domxref("Document")}} interface, {{domxref("Element/toggleAttribute","toggleAttribute()")}}, {{domxref("Element/setAttribute","setAttribute()")}}, {{domxref("Element/setAttributeNS","setAttributeNS()")}} of the {{domxref("Element")}} interface, {{domxref("DOMImplementation/createDocument","createDocument()")}} of the {{domxref("DOMImplementation")}} interface, and {{domxref("CustomElementRegistry/define","define()")}} and {{domxref("CustomElementRegistry/whenDefined","whenDefined()")}} of the {{domxref("CustomElementRegistry/whenDefined","whenDefined()")}} interface.
([Firefox bug 1773312](https://bugzil.la/1773312)).

#### Media, WebRTC, and Web Audio

- The {{domxref("HTMLMediaElement.captureStream()")}} method is now supported.
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