If you had to pick _one_, which web platform feature would you like in Firefox that isn't part of the Interop 2026 effort?
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MathML
Mathematics Rendering · Issue #1140 · web-platform-tests/interop
Description This proposal seeks to improve the success rate of the already defined MathML presentation tests https://wpt.fyi/results/mathml/presentation-markup?label=experimental&label=master&aligned (Resubmission of #787) as the problem...
GitHub (github.com)
.... because shipping 1.1MB of JavaScript on Wikipedia articles is a tough compromise.
T414055 Performance review of MathJax client-side mode
>>! @Krinkle wrote at T271001#11499253:
Phabricator (phabricator.wikimedia.org)
@krinkle which bits are missing in the latest versions of browsers?
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If you had to pick _one_, which web platform feature would you like in Firefox that isn't part of the Interop 2026 effort? https://hacks.mozilla.org/2026/02/launching-interop-2026/#new-features
@firefoxwebdevs VirtualKeyboard API:
VirtualKeyboard API - Web APIs | MDN
The VirtualKeyboard API provides developers control over the layout of their applications when the on-screen virtual keyboard appears and disappears on devices such as tablets, mobile phones, or other devices where a hardware keyboard may not be available.
MDN Web Docs (developer.mozilla.org)
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If you had to pick _one_, which web platform feature would you like in Firefox that isn't part of the Interop 2026 effort? https://hacks.mozilla.org/2026/02/launching-interop-2026/#new-features
@firefoxwebdevs
Reference target for cross root aria, or something like it
Declarative custom elements
DOM Parts and Template instantiation -
@ausi just to double check, you mean margin-trim, not text-box-trim?
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@gundersen would you be ok if it was behind a site permission addon? https://support.mozilla.org/en-US/kb/site-permission-add-ons
@firefoxwebdevs Yes, as long as there is a good way to detect a blocked permission, so you can reask the user or gracefully degrade the experience.
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If you had to pick _one_, which web platform feature would you like in Firefox that isn't part of the Interop 2026 effort? https://hacks.mozilla.org/2026/02/launching-interop-2026/#new-features
@firefoxwebdevs
inline if() CSS -
@ausi just to double check, you mean margin-trim, not text-box-trim?
@firefoxwebdevs yes, margin-trim. Safari supports it and I think Chrome is working on it too IIRC.
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If you had to pick _one_, which web platform feature would you like in Firefox that isn't part of the Interop 2026 effort? https://hacks.mozilla.org/2026/02/launching-interop-2026/#new-features
@firefoxwebdevs Missing CSS random() has previously blocked me from porting JS to CSS.
types: `random()` | Can I use... Support tables for HTML5, CSS3, etc
"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.
(caniuse.com)
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If you had to pick _one_, which web platform feature would you like in Firefox that isn't part of the Interop 2026 effort? https://hacks.mozilla.org/2026/02/launching-interop-2026/#new-features
@firefoxwebdevs The new "install app" button in Firefox for Windows is a welcome addition, but makes it hard to provide good user guides, as support is not guaranteed. I hope you are working on expanding support to all platforms.
An alternate way to make this easier, is to suppprt the install button, which would make guides much simpler and no longer dependent on specific browser knowledge.
MSEdgeExplainers/WebInstall/explainer-current-doc.md at main · MicrosoftEdge/MSEdgeExplainers
Home for explainer documents originated by the Microsoft Edge team - MSEdgeExplainers/WebInstall/explainer-current-doc.md at main · MicrosoftEdge/MSEdgeExplainers
GitHub (github.com)
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@krinkle which bits are missing in the latest versions of browsers?
WPT cover a dozen or so missing bits.
Beyond that, the clearest cut ones are cataloged and polyfilled at https://github.com/w3c/mathml-polyfills. Compare https://w3c.github.io/mathml-polyfills/acid-test.html in two tabs with and without the transform applied.
For things that are implemented but have known bugs, there is for example a layout bug with mathrm introducing whitespace in Firefox between symbols, where Chrome/Safari/MathJax don't:
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@gundersen would you be ok if it was behind a site permission addon? https://support.mozilla.org/en-US/kb/site-permission-add-ons
@firefoxwebdevs maybe, but I don't want to normalize instructions to end users about changing browser configs. If people get used to following instructions on website to enable stuff they don't understand then they are more likely to be tricked into enabling something they shouldn't. I'd rather just have a browser ui popup, like webcam and microphone has. Especially I'm thinking of consumer products that need to be set up by the user and could be done using Bluetooth in a website.
