Loading…
Dataset 20261011-0550-f160c57 · measured 2026-10-11 05:50 UTC
writing-mode
◐matches Chrome on some values4 of 6 examples match Chromecss-writing-modes-4
Some of the examples match Chrome and some do not. The count beside the verdict says how many — 11 of 12 — and the values that differ are listed on the property page. It is neither a pass nor a failure, and filing it under either would be a lie in one direction.
Here: 4 of 6 examples match Chrome. The 2 that do not: writing-mode:vertical-rl, writing-mode:vertical-lr — shown first below, each with its difference map.
What the specification says
- Initial value
- horizontal-tb
- Applies to
- All elements except table row groups, table column groups, table rows, table columns, ruby base containers, ruby annotation containers
- Inherited
- yes
- Percentages
- n/a
- Computed value
- specified value
- Syntax
- horizontal-tb | vertical-rl | vertical-lr | sideways-rl | sideways-lr
The measurements
6 examples, 4 of them matching Chrome, the rest first. Each is one declaration on a small page, drawn by Chrome and by our engine. Drag the handle to wipe between them.
writing-mode:vertical-rl✕renders differently
Our renderChrome3,228 pixels differ from Chrome, the largest by 215 of 255 on one channel.
- Differing pixels
- 3,228
- Max channel delta
- 215
writing-mode:vertical-lr✕renders differently
Our renderChrome3,980 pixels differ from Chrome, the largest by 215 of 255 on one channel.
- Differing pixels
- 3,980
- Max channel delta
- 215
writing-mode:sideways-rl✓pixel-exact
Our renderChromeIdentical to Chrome: nothing differs, so there is no difference map to show.
- Differing pixels
- 0
- Max channel delta
- 0
writing-mode:sideways-lr✓pixel-exact
Our renderChromeIdentical to Chrome: nothing differs, so there is no difference map to show.
- Differing pixels
- 0
- Max channel delta
- 0
writing-mode:sideways-lr✓pixel-exact
Our renderChromeIdentical to Chrome: nothing differs, so there is no difference map to show.
- Differing pixels
- 0
- Max channel delta
- 0
writing-mode:vertical-rl✓pixel-exact
Our renderChromeIdentical to Chrome: nothing differs, so there is no difference map to show.
- Differing pixels
- 0
- Max channel delta
- 0
Which values were measured
“Supported” on one example means “supported at the value we tried”. The property’s declared grammar has 5 branches; 4 of them carry a measurement. The publishing ceiling is 12 examples per property — a branch past it is left out by our choice, not by accident.
| Value | Measured |
|---|---|
| vertical-rl | ✕renders differently |
| vertical-lr | ✕renders differently |
| sideways-rl | ✓pixel-exact |
| sideways-lr | ✓pixel-exact |
| horizontal-tb | not measured |
Tests in the suite that name this property
Secondary evidence: 13 Web Platform Tests carry a spec anchor pointing at this property. Only 1,254 tests in the whole corpus carry such an anchor, so an empty list here means nothing at all.
✓css/css-flexbox/flexbox-writing-mode-007.html✓css/css-flexbox/flexbox-writing-mode-008.html✓css/css-flexbox/flexbox-writing-mode-009.html✓css/css-flexbox/flexbox-writing-mode-010.html✓css/css-flexbox/flexbox-writing-mode-011.html✓css/css-flexbox/flexbox-writing-mode-012.html✓css/css-flexbox/flexbox-writing-mode-013.html✓css/css-flexbox/flexbox-writing-mode-014.html✓css/css-flexbox/flexbox-writing-mode-015.html✓css/css-flexbox/flexbox-writing-mode-016.html✕css/css-flexbox/flexbox-writing-mode-slr-row-mix.html✕css/css-flexbox/flexbox-writing-mode-srl-row-mix.html
+ 1 more
Measured against Chrome 148.0.7778.96 on 2026-10-11, with up to 40 candidate values tried per property. All properties · How the measurement works