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Dataset 20260827-2142-2f1b575 · measured 2026-08-27 21:42 UTC
border-shape
✕parsed, no effectcss-borders-4
The parser accepts the name, yet our rendering is byte-identical with and without the declaration while Chrome's is not. The declaration is being swallowed.
What the specification says
- Initial value
- none
- Applies to
- all elements
- Inherited
- no
- Percentages
- see prose
- Computed value
- list, each item a computed color
- Syntax
- none | [ <basic-shape> <geometry-box>?]{1,2}
The measurements
Each example is one declaration on a small page, drawn by Chrome and by our engine. Drag the handle to wipe between them.
border-shape:ellipse(80px 40px)✕renders differently
Our renderChrome6,608 pixels differ from Chrome, the largest by 204 of 255 on one channel.
- Differing pixels
- 6,608
- Max channel delta
- 204
border-shape:circle(60px)✕renders differently
Our renderChrome6,463 pixels differ from Chrome, the largest by 204 of 255 on one channel.
- Differing pixels
- 6,463
- Max channel delta
- 204
border-shape:inset(20px) content-box✕renders differently
Our renderChrome7,680 pixels differ from Chrome, the largest by 204 of 255 on one channel.
- Differing pixels
- 7,680
- Max channel delta
- 204
border-shape:inset(20px) fill-box✕renders differentlyOur renderChrome7,680 pixels differ from Chrome, the largest by 204 of 255 on one channel.
- Differing pixels
- 7,680
- Max channel delta
- 204
border-shape:inset(20px) padding-box✕renders differently
Our renderChrome10,752 pixels differ from Chrome, the largest by 204 of 255 on one channel.
- Differing pixels
- 10,752
- Max channel delta
- 204
border-shape:polygon(0 0, 100% 0, 50% 100%)✕renders differently
Our renderChrome7,569 pixels differ from Chrome, the largest by 204 of 255 on one channel.
- Differing pixels
- 7,569
- Max channel delta
- 204
border-shape:inset(20px) margin-box✕parsed, no effect
Our renderChrome32,256 pixels differ from Chrome, the largest by 204 of 255 on one channel.
- Differing pixels
- 32,256
- Max channel delta
- 204
border-shape:inset(20px)✕renders differently
Our renderChrome11,776 pixels differ from Chrome, the largest by 153 of 255 on one channel.
- Differing pixels
- 11,776
- Max channel delta
- 153
border-shape:inset(20px) half-border-box✕parsed, no effectOur renderChrome29,376 pixels differ from Chrome, the largest by 204 of 255 on one channel.
- Differing pixels
- 29,376
- Max channel delta
- 204
border-shape:inset(20px) border-box✕renders differently
Our renderChrome12,800 pixels differ from Chrome, the largest by 204 of 255 on one channel.
- Differing pixels
- 12,800
- Max channel delta
- 204
border-shape:inset(20px) stroke-box✕renders differently
Our renderChrome12,800 pixels differ from Chrome, the largest by 204 of 255 on one channel.
- Differing pixels
- 12,800
- Max channel delta
- 204
border-shape:inset(20px) view-box✕renders differentlyOur renderChrome12,800 pixels differ from Chrome, the largest by 204 of 255 on one channel.
- Differing pixels
- 12,800
- Max channel delta
- 204
Which values were measured
“Supported” on one example means “supported at the value we tried”. The property’s declared grammar has 13 branches; 12 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 |
|---|---|
| inset(20px) | ✕renders differently |
| circle(60px) | ✕renders differently |
| ellipse(80px 40px) | ✕renders differently |
| polygon(0 0, 100% 0, 50% 100%) | ✕renders differently |
| inset(20px) content-box | ✕renders differently |
| inset(20px) padding-box | ✕renders differently |
| inset(20px) border-box | ✕renders differently |
| inset(20px) margin-box | ✕parsed, no effect |
| inset(20px) half-border-box | ✕parsed, no effect |
| inset(20px) fill-box | ✕renders differently |
| inset(20px) stroke-box | ✕renders differently |
| inset(20px) view-box | ✕renders differently |
| none | not measured |
Measured against Chrome 148.0.7778.96 on 2026-08-27, with up to 40 candidate values tried per property. All properties · How the measurement works