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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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.
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@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.
@firefoxwebdevs currently I have to download an app for every different vendor, which is obviously completely unnecessary. It's just as annoying as every router now requiring an app, rather than just going to 192.168.0.1 and being greeted by a web interface. Why can't I just use my browser to set up connected consumer devices???
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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 Surprised sibling-index and sibling-count weren't commented here already.
It's a really big nice-to-have, right up there with text-box-trim.
But other things like dialog closedby, cross root aria, making more web component apis declarative, and better selects are musts.
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@firefoxwebdevs Surprised sibling-index and sibling-count weren't commented here already.
It's a really big nice-to-have, right up there with text-box-trim.
But other things like dialog closedby, cross root aria, making more web component apis declarative, and better selects are musts.
@spartanatreyu text-box-trim is a personal wish of mine,
