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 <mailto:[email protected]> @Daniel Bratell
<mailto:[email protected]> 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
<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/>.
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