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Dataset 20261011-0550-f160c57 · measured 2026-10-11 05:50 UTC
overflow
◐matches Chrome on some values4 of 5 examples match Chromecss-overflow-3
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 5 examples match Chrome. The one that does not: overflow:visible — shown first below, each with its difference map.
What the specification says
- Initial value
- visible
- Applies to
- block containers [CSS2], flex containers [CSS3-FLEXBOX], and grid containers [CSS3-GRID-LAYOUT]
- Inherited
- no
- Percentages
- N/A
- Computed value
- see individual properties
- Syntax
- <'overflow-block'>{1,2}
The measurements
5 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.
overflow:visible✕renders differently
Our renderChrome798 pixels differ from Chrome, the largest by 52 of 255 on one channel.
- Differing pixels
- 798
- Max channel delta
- 52
overflow:hidden✓pixel-exact
Our renderChromeIdentical to Chrome: nothing differs, so there is no difference map to show.
- Differing pixels
- 0
- Max channel delta
- 0
overflow:clip✓pixel-exact
Our renderChromeIdentical to Chrome: nothing differs, so there is no difference map to show.
- Differing pixels
- 0
- Max channel delta
- 0
overflow:scroll✓pixel-exactOur renderChromeIdentical to Chrome: nothing differs, so there is no difference map to show.
- Differing pixels
- 0
- Max channel delta
- 0
overflow:auto✓pixel-exactOur 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; 5 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 |
|---|---|
| hidden | ✓pixel-exact |
| clip | ✓pixel-exact |
| scroll | ✓pixel-exact |
| visible | ✕renders differently |
| auto | ✓pixel-exact |
Tests in the suite that name this property
Secondary evidence: 24 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/overflow-auto-005.html✓css/css-grid/grid-model/grid-areas-overflowing-grid-container-001.html✓css/css-grid/grid-model/grid-areas-overflowing-grid-container-002.html✓css/css-grid/grid-model/grid-areas-overflowing-grid-container-003.html✓css/css-grid/grid-model/grid-areas-overflowing-grid-container-004.html✓css/css-grid/grid-model/grid-areas-overflowing-grid-container-005.html✓css/css-grid/grid-model/grid-areas-overflowing-grid-container-006.html✓css/css-grid/grid-model/grid-areas-overflowing-grid-container-007.html✓css/css-grid/grid-model/grid-areas-overflowing-grid-container-008.html✓css/css-grid/grid-model/grid-areas-overflowing-grid-container-009.html✓css/css-grid/grid-model/grid-overflow-padding-001.html✓css/css-grid/grid-model/grid-overflow-padding-002.html
+ 12 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