[developer-signals] weekly digest

WebDX CG developer-signals weekly digest

web-platform-dx/developer-signals

This is an automated email summarizing recent activity on the  
developer-signals repo, which is where web developers add their support for  
web features that are not yet implemented in all major browsers.


High-interest features like JPEG XL and Anchor positioning continue their  
steady upward trajectories, while Masonry and Customizable <select>  
maintain consistent momentum among developers. Activity around Scoped  
custom element registries highlighted the feature entering experimental  
support in Firefox 150, alongside technical discussions for @function  
regarding the centralization of theme logic to keep CSS DRY. A new detailed  
use case for Speculation rules emphasized its utility in prerendering  
asset-heavy editors to mitigate slow startup times, a significant pain  
point for non-Chromium users. Other notable signals include a relative  
surge in interest for Scroll-driven animations and continued engagement  
with Temporal and if() , reflecting a broad focus on both high-performance  
UI and more robust native logic primitives.


32 active features


JPEG XL (#215)

👍 +6

Masonry (#308)

👍 +5

Anchor positioning (#245)

👍 +5

Customizable <select> (#278)

👍 +4

Scroll-driven animations (#207)

👍 +4

if() (#303)

👍 +3

Temporal (#291)

👍 +3

field-sizing (#234)

👍 +3

Container style queries (#196)

👍 +3

@function (#300)

👍 +2
💬 +1
"Trying to keep CSS DRY and semantically valuable inevitably leads to use  
CSS variables to hold theme colors. Now components should respect t..."  
(@modellking)

attr() (#293)

👍 +2

interpolate-size (#253)

👍 +2

Scoped custom element registries (#364)

👍 +1
💬 +1
"This is shipping as experimental in Firefox 150:  
https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/150..."  
(@Kai-Richardson)

Lazy-loading media (#534)

👍 +1

display-mode media query (#508)

👍 +1

:autofill (#500)

👍 +1

Scroll marker target pseudo-classes (#476)

👍 +1

scroll-target-group (#475)

👍 +1

scrollIntoView() container (#463)

👍 +1

corner-shape (#398)

👍 +1

:open (#310)

👍 +1

contrast-color() (#295)

👍 +1

popover="hint" (#274)

👍 +1

Container scroll-state queries (#272)

👍 +1

calc-size() (#252)

👍 +1

Cross-document view transitions (#248)

👍 +1

overlay (#211)

👍 +1

WebGPU (#202)

👍 +1

context-fill and context-stroke (#199)

👍 +1

Local fonts (#174)

👍 +1

Web app manifest (#57)

👍 +1

Speculation rules (#186)

💬 +1
"## What I want to do with this feature My company has a web app in which  
users can create, edit, and save documents. The app's landing page..."  
(@akgit18)


Activity since 2026-04-02