On Mon, May 18, 2026 at 5:55 PM Mike Taylor <[email protected]> wrote:
> On 5/18/26 4:11 p.m., Florin Malita wrote: > > *Contact emails* > [email protected], [email protected], [email protected], > [email protected] > > *Explainer* > https://github.com/fserb/canvas2D/blob/master/spec/enhanced-textmetrics.md > > https://github.com/Igalia/explainers/blob/main/canvas-formatted-text/text-metrics-additions.md > https://github.com/whatwg/html/issues/10677 > > *Specification* > https://github.com/whatwg/html/pull/11000 > > *Summary* > Expand the TextMetrics Canvas API to support selection rectangles, > bounding box queries, and glyph cluster-based operations. This new > functionality should enable complex text editing applications with accurate > selection, caret positioning, and hit testing. Additionally, cluster-based > rendering facilitates sophisticated text effects such as independent > character animations and styling. > > *Blink component* > Blink>Canvas > <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ECanvas%22> > > *Web Feature ID* > *No information provided* > > *TAG review* > https://github.com/w3ctag/design-reviews/issues/1095 > > *TAG review status* > Pending > > *Origin Trial Name* > Enhanced Canvas TextMetrics > > *Goals for experimentation* > Partners have implemented prototypes based on the available runtime > feature, with positive feedback. They are now interested in expanding the > scope, and testing the API with real users. This experiment will provide > valuable validation in real-world use scenarios, and should help us gauge > the proposed API's fitness, ergonomics, and performance. > > Can you also comment on progress in the following areas? > > Draft spec (early draft is ok, but must be spec-like and associated with > the appropriate standardization venue, or WICG) > Just to add to Mike's question here, the last activity on this HTML PR https://github.com/whatwg/html/pull/11000 seems to be from roughly a year ago. Is this still under active discussion? (Similar activity on https://github.com/whatwg/html/issues/10677) Thanks, Vlad > TAG review (see exceptions) > signals requests > Outreach for feedback from the spec community > WPT tests > > > *Chromium Trial Name* > ExtendedTextMetrics > > *Origin Trial documentation link* > > https://github.com/Igalia/explainers/blob/main/canvas-formatted-text/text-metrics-additions.md > > *WebFeature UseCounter name* > kExtendedTextMetrics > > *Risks* > > > *Interoperability and Compatibility* > These are new features and we will get vendor agreement at WHATWG before > shipping. So minimal interop risks beyond platform-specific metrics > differences. > > *Gecko*: No signal ( > https://github.com/mozilla/standards-positions/issues/1144) > > *WebKit*: No signal ( > https://github.com/WebKit/standards-positions/issues/436) > > *Web developers*: Positive Developers want the ability to animated glyphs > independendly (such as exploding sentences) and the ability to do e.g. > selection on canvas text. The proposed APIs support these use cases and > more. > > *Other signals*: > > *Ergonomics* > None. > > *Activation* > None. > > *Security* > There is always a fingerprinting concern with HTML canvas. THe new > features expose no novel fingerprinting surface (text metrics are already a > fingerprinting concern). > > *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 information provided* > > > *Reason this experiment is being extended* > Flutter Web has provided positive initial feedback based on internal > testing. To validate the feature at scale, they require additional time to > expose it to external developers via their own experimentation > infrastructure. > > The goal of this extension is to gather telemetry and feedback from > real-world applications, allowing us to identify and address any remaining > rough edges before proceeding with a formal launch. > > *Ongoing technical constraints* > *No information provided* > > *Debuggability* > DevTools supports querying the APIs by default. > > *Will this feature be supported on all six Blink platforms (Windows, Mac, > Linux, ChromeOS, Android, and Android WebView)?* > Yes > > *Is this feature fully tested by web-platform-tests > <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?* > Yes > html/canvas/[element|offscreen]/text... 2d.text.measure.index-from-offset* > 2d.text.measure.selection-rects* 2d.text.measure.text-clusters* > https://wpt.fyi/results/html/canvas/element/text?label=master&label=experimental&aligned&q=tentative > > https://wpt.fyi/results/html/canvas/offscreen/text?label=master&label=experimental&aligned&q=tentative > > I see there are some tests that pass in all browsers - that suggests the > test isn't working as intended? > > e.g., > https://wpt.fyi/results/html/canvas/offscreen/text/2d.text.measure.strokeTextCluster-font-change.tentative.html?label=master&label=experimental&aligned&q=tentative > > > *Flag name on about://flags* > Experimental Web Platform Features > > *Finch feature name* > ExtendedTextMetrics > > *Requires code in //chrome?* > False > > *Tracking bug* > https://issues.chromium.org/issues/341213359 > > *Measurement* > UMA counters will be added for the new APIs. > > *Estimated milestones* > Origin trial desktop first 144 > Origin trial desktop last 149 > Origin trial extension 1 end milestone 155 > DevTrial on desktop 141 > Origin trial Android first 144 > Origin trial Android last 149 > DevTrial on Android 141 > > *Link to entry on the Chrome Platform Status* > https://chromestatus.com/feature/5075532483657728?gate=5178855770947584 > > *Links to previous Intent discussions* > Intent to Prototype: > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CADgYMVdqo4PBs4OkGqVncRizs8vtX4YtFLDcK%2BRxdYo_wnaRJQ%40mail.gmail.com > Ready for Trial: > https://groups.google.com/a/chromium.org/g/blink-dev/c/OLCCI0ExvIk > Intent to Experiment: > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CADgYMVfC-Naw8pFVaUUPMSfW-u3kC7SMdDeHJgwU5YmSHOOeeA%40mail.gmail.com > > > 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 visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CADgYMVfjd5mbDkm16_Xf4fxfnrEeiAXLhjiBCXWik0GaNJGE2Q%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CADgYMVfjd5mbDkm16_Xf4fxfnrEeiAXLhjiBCXWik0GaNJGE2Q%40mail.gmail.com?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/7942727a-4657-40c4-95c3-172fcab90271%40chromium.org > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/7942727a-4657-40c4-95c3-172fcab90271%40chromium.org?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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