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Dataset 20260827-2142-2f1b575 · measured 2026-08-27 21:42 UTC
opacity
≈below the visible thresholdcss-color-4
Differs from Chrome only inside the measured anti-aliasing band (maximum channel distance 3 of 255). Curves, rotation and gradients land here.
What the specification says
- Initial value
- 1
- Applies to
- all elements
- Inherited
- no
- Percentages
- map to the range [0,1]
- Computed value
- specified number, clamped to the range [0,1]
- Syntax
- <opacity-value>
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.
opacity:50%≈below the visible threshold
Our renderChrome24,000 pixels differ from Chrome, the largest by 1 of 255 on one channel.
- Differing pixels
- 24,000
- Max channel delta
- 1
opacity:0.4≈below the visible threshold
Our renderChrome24,000 pixels differ from Chrome, the largest by 1 of 255 on one channel.
- Differing pixels
- 24,000
- Max channel delta
- 1
opacity:40%≈below the visible thresholdOur renderChrome24,000 pixels differ from Chrome, the largest by 1 of 255 on one channel.
- Differing pixels
- 24,000
- Max channel delta
- 1
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 |
|---|---|
| 2 | ≈below the visible threshold |
| 50% | ≈below the visible threshold |
Tests in the suite that name this property
Secondary evidence: 1 Web Platform Test 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.
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