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Dataset 20261011-0550-f160c57 · measured 2026-10-11 05:50 UTC
border-image-outset
◐matches Chrome on some values4 of 5 examples match Chromecss-borders-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 5 examples match Chrome. The one that does not: border-image-outset:0.4 — shown first below, each with its difference map.
What the specification says
- Initial value
- 0
- Applies to
- All elements, except internal table elements when border-collapse is collapse
- Inherited
- no
- Percentages
- N/A
- Computed value
- four values, each a number or absolute length
- Syntax
- [ <length [0,∞]> | <number [0,∞]> ]{1,4}
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.
border-image-outset:0.4✕renders differently
Our renderChrome22,961 pixels differ from Chrome, the largest by 223 of 255 on one channel.
- Differing pixels
- 22,961
- Max channel delta
- 223
border-image-outset:2≈below the visible threshold
Our renderChrome24,030 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 24,030
- Max channel delta
- 3
border-image-outset:20px≈below the visible threshold
Our renderChrome24,700 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 24,700
- Max channel delta
- 3
border-image-outset:4px≈below the visible threshold
Our renderChrome21,758 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 21,758
- Max channel delta
- 3
border-image-outset:calc(20px + 4px)≈below the visible threshold
Our renderChrome25,248 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 25,248
- Max channel delta
- 3
Which values were measured
“Supported” on one example means “supported at the value we tried”. The property’s declared grammar has 2 branches; 2 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 |
|---|---|
| 20px | ≈below the visible threshold |
| 2 | ✕renders differently |
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