I'm sorry, it's too late. Currently, the HTML spec <https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-letterspacing> says 1. Let parsed be the result of parsing <https://drafts.csswg.org/css-syntax/#parse-grammar> the given value as a CSS <length> <https://drafts.csswg.org/css-values/#lengths>. So, I intent to implement the percentage unit support for context-2d-letterspacing separately at a later time.
Thank you. 2025년 12월 8일 월요일 PM 7시 21분 41초 UTC+9에 一丝님이 작성: > I'm wondering if `CanvasRenderingContext2D.letterSpacing` and > `CanvasRenderingContext2D.wordSpacing` should also support percentage > values? > > Currently, it seems this isn't implemented. > > 在2025年11月12日星期三 UTC+8 23:15:38<Daniel Bratell> 写道： > >> I am sorry for the missing mail. >> >> LGTM1 from me so now you have the three necessary LGTMs. I hope the delay >> hasn't caused too many problems. >> >> /Daniel >> On 2025-11-07 18:59, Mike Taylor wrote: >> >> Sure, let's do this in reverse order: LGTM2 >> >> (both Daniel and I have already approved on chromestatus) >> On 11/7/25 4:54 a.m., Philip Jägenstedt wrote: >> >> LGTM3 as you already have two LGTMs on the original thread. >> >> @Mike Taylor @Daniel Bratell would you mind repeating your LGTMs here >> and on the chromestatus entry? >> >> On Thu, Nov 6, 2025 at 9:04 PM Minseong Kim <[email protected]> wrote: >> >>> *Contact emails* >>> [email protected] >>> >>> *Specification* >>> https://www.w3.org/TR/css-text-4/#propdef-letter-spacing >>> https://www.w3.org/TR/css-text-4/#propdef-word-spacing >>> >>> *Summary* >>> Enables percentage values for the letter-spacing and word-spacing CSS >>> property, as defined in the CSS Text Module Level 4 spec. Percentage values >>> are calculated relative to the advance measure of the space character >>> (U+0020). This gives developers more robust and flexible control over >>> typography, particularly in responsive designs where text spacing needs to >>> adapt to different viewports and font sizes. >>> >>> *Blink component* >>> Blink>Layout>Inline >>> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ELayout%3EInline%22> >>> >>> *Web Feature ID* >>> letter-spacing <https://webstatus.dev/features/letter-spacing> >>> >>> *Motivation* >>> The 'letter-spacing' and 'word-spacing' properties currently only accept >>> fixed length values (e.g. px, em), which are inflexible in responsive >>> designs. When font sizes or container dimensions change, this fixed spacing >>> can become disproportionate, forcing developers to write complex media >>> queries or use JavaScript to maintain readable text. Introducing percentage >>> values allows spacing to be defined relative to font-intrinsic metrics. >>> This enables both letter and word spacing to scale proportionally with the >>> font, simplifying the creation of robust and visually consistent typography >>> across all devices without extra code. >>> >>> *Initial public proposal* >>> *No information provided* >>> >>> *Search tags* >>> letter-spacing <https://chromestatus.com/features#tags:letter-spacing>, >>> word-spacing <https://chromestatus.com/features#tags:word-spacing> >>> >>> *TAG review* >>> *No information provided* >>> >>> *TAG review status* >>> Not applicable >>> >>> *Risks* >>> >>> >>> *Interoperability and Compatibility* >>> Risks are low. This is a support for new value of CSS properties. So >>> sites not using properties won't be affected. Firefox and Safari has >>> supported this feature for years. >>> >>> *Gecko*: Shipped/Shipping Firefox is failing so many letter-spacing >>> tests: >>> https://wpt.fyi/results/css/css-text/letter-spacing?label=experimental&label=master&aligned. >>> >>> But those are related the line ending or boundary handling of >>> letter-spacing, not the percentage values. Related discussion: >>> https://github.com/w3c/csswg-drafts/issues/1518 >>> >>> *WebKit*: Shipped/Shipping (https://github.com/WebKit/WebKit/pull/18771) >>> >>> *Web developers*: No signals ( >>> https://issues.chromium.org/issues/327740939) The issue has 3 votes. >>> >>> *Other signals*: >>> >>> *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* >>> *No information provided* >>> >>> *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 >>> - "letter-spacing-percentage-001.html" file in >>> https://wpt.fyi/results/css/css-text/letter-spacing >>> - "word-spacing-percentage-001.html" file in >>> https://wpt.fyi/results/css/css-text/word-spacing >>> - "letter-spacing-*.html" files in >>> https://wpt.fyi/results/css/css-text/parsing >>> - "word-spacing-*.html" files in >>> https://wpt.fyi/results/css/css-text/parsing >>> >>> *Flag name on about://flags* >>> enable-experimental-web-platform-features >>> >>> *Finch feature name* >>> CSSLetterAndWordSpacingPercentage >>> >>> *Rollout plan* >>> Will ship enabled for all users >>> >>> *Requires code in //chrome?* >>> False >>> >>> *Tracking bug* >>> https://issues.chromium.org/issues/327740939 >>> >>> *Estimated milestones* >>> Shipping on desktop 145 >>> Shipping on Android 145 >>> Shipping on WebView 145 >>> Shipping on iOS 145 >>> >>> *Link to entry on the Chrome Platform Status* >>> https://chromestatus.com/feature/5106867491700736?gate=6484265969778688 >>> >>> 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/CA%2BLL-R6VKL-Muuq-FDTD9KL0prpPyRny00TCCmYmue6L17Hdyg%40mail.gmail.com >>> >>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CA%2BLL-R6VKL-Muuq-FDTD9KL0prpPyRny00TCCmYmue6L17Hdyg%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/CAARdPYebYDApQqccJ_9kxjD4hNz3PRTAL%2BPSUzyn_A6fKNe2qw%40mail.gmail.com >> >> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAARdPYebYDApQqccJ_9kxjD4hNz3PRTAL%2BPSUzyn_A6fKNe2qw%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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