This feature shipped a very long time ago in Chromium and is now interoperably shipped across browsers, so the feature is not going to change. TypeScript will have to adapt accordingly.
On Fri, Feb 13, 2026 at 7:56 AM Vladimir Levin <[email protected]> wrote: > Hey Demetrios, > > Thank you for raising the issue. However, I think this discussion is > likely better suited for a spec venue like WHATWG ( > https://github.com/whatwg/html/issues). > > As far as I can tell, Blink/Chromium implements the specified behavior. It > seems like this causes problems, so maybe we should revisit whether the > spec should change. > > Thanks, > Vlad > > On Thu, Feb 12, 2026 at 7:41 PM Demetrios Papadopoulos < > [email protected]> wrote: > >> Reviving this older through about the hidden="until-found", since it >> seems to be causing issues (newly thrown TS compiler errors with the >> upcoming TS v6) due to HTMLElement's hidden property channging from a >> boolean to boolean|"until-found". Plese see my comment at >> https://github.com/web-platform-dx/developer-signals/issues/170#issuecomment-3894089666 >> for more details. Wondering if the complications with changing the >> property's type was already considered, and whether there is any workaround >> beyond just trying to accomodate for the new type across a codebase. >> >> Thanks! >> On Wednesday, March 23, 2022 at 8:25:53 AM UTC-7 Daniel Bratell wrote: >> >>> LGTM3 >>> >>> /Daniel >>> On 2022-03-23 05:50, Yoav Weiss wrote: >>> >>> LGTM2 >>> >>> On Thursday, March 17, 2022 at 8:10:47 PM UTC+1 Joey Arhar wrote: >>> >>>> Contact emails [email protected] >>>> >>>> Explainer >>>> https://github.com/WICG/display-locking/blob/master/explainers/hidden-content-explainer.md >>>> >>>> Specification https://github.com/whatwg/html/pull/7475 >>>> >>>> Design docs >>>> https://github.com/WICG/display-locking/blob/master/explainers/hidden-content-explainer.md >>>> >>>> Summary >>>> >>>> This feature extends the existing hidden attribute with a new value, >>>> "until-found", which makes the element searchable by find-in-page, scroll >>>> to text fragment, and fragment navigation. When these search/navigation >>>> features want to scroll to something inside a hidden=until-found element, >>>> the browser removes the hidden attribute from the element and fires the >>>> "beforematch" event on it so that the newly revealed content can be >>>> scrolled into view. >>>> >>>> >>>> Blink component Blink>HTML >>>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EHTML> >>>> >>>> TAG review https://github.com/w3ctag/design-reviews/issues/511 >>>> >>>> TAG review status Issues addressed >>>> >>>> Risks >>>> >>>> >>>> Interoperability and Compatibility >>>> >>>> Interoperability risks: This feature is built on content-visibility, >>>> which is gradually being implemented in other browsers. The way this >>>> feature extends the existing hidden attribute means that browsers which >>>> don't implement this feature will still render hidden=until-found content >>>> as expected, but without the new find-in-page and ScrollToTextFragment >>>> auto-revealing functionality. Mozilla says this feature is worth >>>> prototyping. Compatibility risks: This feature is unlikely to break >>>> existing websites because they must opt-in by setting the "hidden" >>>> attributes on elements to "until-found". In the unlikely event that >>>> existing websites use hidden=until-found, it will just replace their >>>> "display:none" with "content-visibility:hidden" which will likely render >>>> the same. >>>> >>>> >>>> Gecko: Worth prototyping ( >>>> https://github.com/mozilla/standards-positions/issues/612) >>>> >>> >>> I'll just note that this is not yet the official label, although it >>> seems like it's going that way. >>> >>> >>>> >>>> WebKit: No signal ( >>>> https://lists.webkit.org/pipermail/webkit-dev/2022-March/032142.html) >>>> >>>> Web developers: No signals >>>> >>>> Other signals: >>>> >>>> Ergonomics >>>> >>>> This feature can be used in tandem with scroll to text fragments. This >>>> feature will not make it hard for Chrome to maintain good performance. >>>> >>>> >>>> Activation >>>> >>>> This feature will benefit from having example code in the explainer >>>> repo to show developers how to use it. >>>> >>>> >>>> Security >>>> >>>> What the user types into the find-in-page box should not be visible to >>>> websites, and the beforematch event is a new way for websites to try to >>>> read this information on top of the existing scroll events. I created a >>>> privacy mitigation for all of these attack surfaces for find-in-page by >>>> adding a delay before find-in-page scrolls text into view when needed so >>>> websites are unlikely to be able to incrementally build what the user is >>>> typing into find-in-page. >>>> >>>> >>>> WebView Application Risks >>>> >>>> *Does this intent deprecate or change behavior of existing APIs, such >>>> that it has potentially high risk for Android WebView-based applications?* >>>> No >>>> >>>> >>>> Debuggability >>>> >>>> There are no DevTools features for the scrolling, URL fragment, and >>>> event firing impacts that beforematch has. >>>> >>>> >>>> Is this feature fully tested by web-platform-tests >>>> <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md> >>>> ? The find-in-page portion of this feature can't be tested because >>>> find-in-page can't be tested in WPT yet: >>>> https://github.com/web-platform-tests/wpt/issues/29915 >>>> Here are some tests which I will try to move to WPT soon: >>>> https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/web_tests/wpt_internal/display-lock/beforematch/ >>>> Here are WPTs for the hidden IDL changes to allow "until-found": >>>> https://github.com/web-platform-tests/wpt/pull/32465 >>>> >>>> Flag name --enable-blink-features=BeforeMatchEvent >>>> >>>> Requires code in //chrome? False >>>> >>>> Tracking bug >>>> https://bugs.chromium.org/p/chromium/issues/detail?id=1055002 >>>> >>>> Launch bug >>>> https://bugs.chromium.org/p/chromium/issues/detail?id=1302408 >>>> >>>> Estimated milestones >>>> >>>> 102 >>>> >>>> >>>> Link to entry on the Chrome Platform Status >>>> https://chromestatus.com/feature/5400510406328320 >>>> >>>> Links to previous Intent discussions Intent to prototype: >>>> https://groups.google.com/a/chromium.org/forum/#!searchin/blink-dev/beforematch%7Csort:date/blink-dev/QKUZ_ALJdM8/j6daEdmUAgAJ >>>> Intent to Experiment: >>>> https://groups.google.com/a/chromium.org/d/msg/blink-dev/aTrk7__Eiq4/BOGSzGHeAwAJ >>>> >>>> >>>> This intent message was generated by Chrome Platform Status >>>> <https://chromestatus.com/>. >>>> >>> -- >>> >>> You received this message because you are subscribed to the Google >>> Groups "blink-dev" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> >>> To view this discussion on the web visit >>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/5930d990-4a7c-4dea-8952-23bcb7d68e8dn%40chromium.org >>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/5930d990-4a7c-4dea-8952-23bcb7d68e8dn%40chromium.org?utm_medium=email&utm_source=footer> >>> . >>> >>> -- >> You received this message because you are subscribed to the Google Groups >> "blink-dev" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion visit >> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/3c0f15c2-ed6a-460e-b309-a5e9b198239fn%40chromium.org >> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/3c0f15c2-ed6a-460e-b309-a5e9b198239fn%40chromium.org?utm_medium=email&utm_source=footer> >> . >> > -- > You received this message because you are subscribed to the Google Groups > "blink-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CADsXd2M1OzOo2Bh8mzcj35SL4tyFBvNtNn4nCWCX3oLTeN_hZg%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CADsXd2M1OzOo2Bh8mzcj35SL4tyFBvNtNn4nCWCX3oLTeN_hZg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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