state-of-the-art software

1. next
   Open UIA W3C community group designing, with the browser makers, the controls HTML still lacks: menus, selects, tooltips. Each turns Newly available the day the last browser ships it.

   1. CFSCustomizable <select>, in Chrome and Safari, not yet in Firefox73%↳ here already: the people picker in Interface's work app, nativelyLimited availability · 73% of people can use it
   2. CFSInterest invokers, in Chrome, not yet in Firefox and Safari72%↳ hover cards and tooltips, with no scriptLimited availability · 72% of people can use it

   Interop 2026This year's shared plan of the browser makers — Apple, Google, Igalia, Microsoft and Mozilla — for features to work alike everywhere. Each turns Newly available the day the last browser ships it.

   1. CFSpopover="hint", in Chrome and Firefox, not yet in Safari50%↳ a tooltip that leaves an open menu openLimited availability · 50% of people can use it
   2. CFS<dialog closedby>, in Chrome and Firefox, not yet in Safari75%↳ here already: the principles' info dialogLimited availability · 75% of people can use it
2. 2025
   1. DecInvoker commands87%↳ the layer keys above, and the sheets that pick a layerNewly available since Dec 2025, Widely from Jun 2028 · 87% of people can use it
   2. JanPopover95%↳ the section nav, with no JS behind itNewly available since Jan 2025, Widely from Jul 2027 · 95% of people can use it
3. 2024
   1. SepMutually exclusive <details> elements94%↳ your results at the end, one gauge open at a timeNewly available since Sep 2024, Widely from Mar 2027 · 94% of people can use it
4. 2022
   1. Mar<dialog>99%↳ the chain of fallbacks, opened from its principleWidely available since Sep 2024 · 99% of people can use it

1. next
   Interop 2026This year's shared plan of the browser makers — Apple, Google, Igalia, Microsoft and Mozilla — for features to work alike everywhere. Each turns Newly available the day the last browser ships it.

   1. CFSScroll-driven animations, in Chrome and Safari, not yet in Firefox89%↳ here already: the Q flying into the nav, and every act held still at its seamLimited availability · 89% of people can use it
   2. CFSattr(), in Chrome and Firefox, not yet in Safari73%↳ any attribute, read as a length, a colour or a numberLimited availability · 73% of people can use it

   CSS WGThe W3C working group that writes CSS. Each turns Newly available the day the last browser ships it.

   1. CFSContainer scroll-state queries, in Chrome, not yet in Firefox and Safari73%↳ here already: a year inked as it sticks at the topLimited availability · 73% of people can use it
   2. CFSScroll markers, in Chrome, not yet in Firefox and Safari73%↳ here already: the cover carousel's keys and dots in Interface's music app, nativelyLimited availability · 73% of people can use it
   3. CFS@function, in Chrome, not yet in Firefox and Safari73%↳ functions of your own, written in CSSLimited availability · 73% of people can use it
   4. CFSGrid lanes, in Safari, not yet in Chrome and Firefox11%↳ masonry, as a gridLimited availability · 11% of people can use it
2. 2026
   1. Augsibling-count() and sibling-index()85%↳ staggering this very list, and stacking the principles deckNewly available since Aug 2026, Widely from Feb 2029 · 85% of people can use it
   2. Junfield-sizing88%↳ the ⌘K menu's search, as wide as what you typeNewly available since Jun 2026, Widely from Dec 2028 · 88% of people can use it
   3. MayContainer style queries94%↳ one hover lifting every part of the section navNewly available since May 2026, Widely from Nov 2028 · 94% of people can use it
   4. Aprcontrast-color()85%↳ readable text on whichever accent a node carriesNewly available since Apr 2026, Widely from Oct 2028 · 85% of people can use it
   5. Mar@scope85%↳ every component styling itself, and stopping at the ones it holdsNewly available since Mar 2026, Widely from Sep 2028 · 85% of people can use it
   6. JanActive view transition91%↳ holding the page still while this list cross-fadesNewly available since Jan 2026, Widely from Jul 2028 · 91% of people can use it
3. 2025
   1. Sep::details-content91%↳ unfolding a gauge of your resultsNewly available since Sep 2025, Widely from Mar 2028 · 91% of people can use it
4. 2024
   1. Sepbackdrop-filter97%↳ the frosted score chip under the principlesNewly available since Sep 2024, Widely from Mar 2027 · 97% of people can use it
   2. Aug@starting-style94%↳ entrances that animate from nothingNewly available since Aug 2024, Widely from Feb 2027 · 94% of people can use it
   3. Augtransition-behavior94%↳ transitioning discrete propertiesNewly available since Aug 2024, Widely from Feb 2027 · 94% of people can use it
   4. JulRegistered custom properties97%↳ handing each principle card its place in the deckNewly available since Jul 2024, Widely from Jan 2027 · 97% of people can use it
   5. Mayround(), mod(), and rem()93%↳ finding each principle card its column on the boardNewly available since May 2024, Widely from Nov 2026 · 93% of people can use it
   6. Maylight-dark()94%↳ the page ground, both appearances in one valueNewly available since May 2024, Widely from Nov 2026 · 94% of people can use it
   7. Maytext-wrap: balance95%↳ headings that break evenlyNewly available since May 2024, Widely from Nov 2026 · 95% of people can use it
5. 2023
   1. Dec:has()98%↳ holding each act still at its seam, read off the order of the sectionsWidely available since Jun 2026 · 98% of people can use it
   2. DecNesting94%↳ every stylesheet on this siteWidely available since Jun 2026 · 94% of people can use it
   3. Sepimage-set()96%↳ the custom cursor, at 2×Widely available since Mar 2026 · 96% of people can use it
   4. Maycolor-mix()97%↳ every tint in the depth systemWidely available since Nov 2025 · 97% of people can use it
   5. FebContainer queries (size)98%↳ choosing between the principles deck and the boardWidely available since Aug 2025 · 98% of people can use it
6. 2022
   1. DecSmall, large, and dynamic viewport units98%↳ surviving mobile browser chromeWidely available since Jun 2025 · 98% of people can use it
   2. MarCascade layers98%↳ the whole cascade of this site, in one lineWidely available since Sep 2024 · 98% of people can use it
7. 2020
   1. JanScroll snap99%↳ this page — and the free span you are inWidely available since Jul 2022 · 99% of people can use it
8. 2019
   1. SepSticky positioning99%↳ the principles sheet sliding over the linksWidely available since Mar 2022 · 99% of people can use it

1. next
   Interop 2026This year's shared plan of the browser makers — Apple, Google, Igalia, Microsoft and Mozilla — for features to work alike everywhere. Each turns Newly available the day the last browser ships it.

   1. CFSScoped custom element registries, in Chrome and Safari, not yet in Firefox83%↳ custom elements named per shadow root, not once per pageLimited availability · 83% of people can use it

   TC39The committee that writes JavaScript itself. Each turns Newly available the day the last browser ships it.

   1. CFSTemporal, in Chrome and Firefox, not yet in Safari74%↳ dates, times and time zones, done right at lastLimited availability · 74% of people can use it
   2. CFSExplicit resource management, in Chrome and Firefox, not yet in Safari75%↳ a file or a lock that closes itself as its block endsLimited availability · 75% of people can use it
2. 2025
   1. DecEvent timing performance entries94%↳ timing every press you make, for Interface and your resultsNewly available since Dec 2025, Widely from Jun 2028 · 94% of people can use it
   2. DecLargest contentful paint (LCP) performance entries93%↳ how soon this page showed, in your resultsNewly available since Dec 2025, Widely from Jun 2028 · 93% of people can use it
   3. OctView transitions94%↳ cross-fading this list, and writing in the tenth principleNewly available since Oct 2025, Widely from Apr 2028 · 94% of people can use it
3. 2024
   1. AprAbortSignal.timeout()94%↳ capping every status requestNewly available since Apr 2024, Widely from Oct 2026 · 94% of people can use it
4. 2020
   1. JanAutonomous custom elements99%↳ the keys above, and the light that follows your pointer on /usesWidely available since Jul 2022 · 99% of people can use it
5. 2019
   1. MarIntersection observer99%↳ the section spy in the navWidely available since Sep 2021 · 99% of people can use it

Newest first: pale while limited, glowing while Newly available, still once Widely, in Baseline's terms. What is next lights C, F and S as Chrome, Firefox and Safari ship it. A percentage is how many people have a browser that runs it, by caniuse's usage data; a name opens where it runs, browser by browser, on webstatus.dev. Read from web-features 3.40.1, the data behind MDN and caniuse, on 13 Oct 2026.