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Dataset 20260827-2142-2f1b575 · measured 2026-08-27 21:42 UTC
-webkit-mask-position
≈below the visible thresholdcompat
Differs from Chrome only inside the measured anti-aliasing band (maximum channel distance 3 of 255). Curves, rotation and gradients land here.
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.
-webkit-mask-position:bottom≈below the visible threshold
Our renderChrome5,788 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 5,788
- Max channel delta
- 3
-webkit-mask-position:left bottom≈below the visible threshold
Our renderChrome5,788 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 5,788
- Max channel delta
- 3
-webkit-mask-position:right≈below the visible threshold
Our renderChrome5,890 pixels differ from Chrome, the largest by 2 of 255 on one channel.
- Differing pixels
- 5,890
- Max channel delta
- 2
-webkit-mask-position:right top≈below the visible threshold
Our renderChrome5,801 pixels differ from Chrome, the largest by 2 of 255 on one channel.
- Differing pixels
- 5,801
- Max channel delta
- 2
-webkit-mask-position:right 20px top 20px≈below the visible threshold
Our renderChrome5,890 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 5,890
- Max channel delta
- 3
-webkit-mask-position:center≈below the visible threshold
Our renderChrome5,890 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 5,890
- Max channel delta
- 3
-webkit-mask-position:50%≈below the visible thresholdOur renderChrome5,890 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 5,890
- Max channel delta
- 3
-webkit-mask-position:center center≈below the visible thresholdOur renderChrome5,890 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 5,890
- Max channel delta
- 3
-webkit-mask-position:20px≈below the visible threshold
Our renderChrome5,890 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 5,890
- Max channel delta
- 3
-webkit-mask-position:top✓pixel-exact
Our renderChrome5,782 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 5,782
- Max channel delta
- 3
-webkit-mask-position:center top✓pixel-exact
Our renderChrome5,782 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 5,782
- Max channel delta
- 3
-webkit-mask-position:50% top✓pixel-exactOur renderChrome5,782 pixels differ from Chrome, the largest by 3 of 255 on one channel.
- Differing pixels
- 5,782
- 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 53 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 |
|---|---|
| left | not measured |
| center | ≈below the visible threshold |
| right | ≈below the visible threshold |
| top | ✓pixel-exact |
| bottom | ≈below the visible threshold |
| x-start | not measured |
| x-end | not measured |
| y-start | not measured |
| y-end | not measured |
| block-start | not measured |
| block-end | not measured |
| inline-start | not measured |
| inline-end | not measured |
| 20px | ≈below the visible threshold |
| 50% | ≈below the visible threshold |
| left top | not measured |
| center top | ✓pixel-exact |
| right top | ≈below the visible threshold |
| x-start top | not measured |
| x-end top | not measured |
| left center | not measured |
| left bottom | ≈below the visible threshold |
| left y-start | not measured |
| left y-end | not measured |
| 20px top | not measured |
| 50% top | ✓pixel-exact |
| left 20px | not measured |
| left 50% | not measured |
| block-start inline-start | not measured |
| center inline-start | not measured |
| block-end inline-start | not measured |
| block-start center | not measured |
| block-start inline-end | not measured |
| start start | not measured |
| center center | ≈below the visible threshold |
| end end | not measured |
| left 20px top 20px | not measured |
| right 20px top 20px | ≈below the visible threshold |
| x-start 20px top 20px | not measured |
| x-end 20px top 20px | not measured |
| left 50% top 20px | not measured |
| left 20px bottom 20px | not measured |
| left 20px y-start 20px | not measured |
| left 20px y-end 20px | not measured |
| left 20px top 50% | not measured |
| block-start 20px inline-start 20px | not measured |
| block-end 20px inline-start 20px | not measured |
| block-start 50% inline-start 20px | not measured |
| block-start 20px inline-end 20px | not measured |
| block-start 20px inline-start 50% | not measured |
| start 20px start 20px | not measured |
| end 20px end 20px | not measured |
| start 50% start 50% | 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