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Dataset 20260827-2142-2f1b575 · measured 2026-08-27 21:42 UTC
font-size
✕parsed, no effectcss-fonts-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
- medium
- Applies to
- all elements and text
- Inherited
- yes
- Percentages
- refer to parent element’s font size
- Computed value
- an absolute length
- Syntax
- <absolute-size> | <relative-size> | <length-percentage [0,∞]> | math
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.
font-size:xxx-large✕renders differently
Our renderChrome9,604 pixels differ from Chrome, the largest by 45 of 255 on one channel.
- Differing pixels
- 9,604
- Max channel delta
- 45
font-size:xx-large✕renders differently
Our renderChrome6,942 pixels differ from Chrome, the largest by 45 of 255 on one channel.
- Differing pixels
- 6,942
- Max channel delta
- 45
font-size:50%✓pixel-exact
Our renderChrome330 pixels differ from Chrome, the largest by 45 of 255 on one channel.
- Differing pixels
- 330
- Max channel delta
- 45
font-size:xx-small✓pixel-exact
Our renderChrome396 pixels differ from Chrome, the largest by 45 of 255 on one channel.
- Differing pixels
- 396
- Max channel delta
- 45
font-size:x-small✓pixel-exact
Our renderChrome528 pixels differ from Chrome, the largest by 45 of 255 on one channel.
- Differing pixels
- 528
- Max channel delta
- 45
font-size:smaller✕renders differently
Our renderChrome4,825 pixels differ from Chrome, the largest by 221 of 255 on one channel.
- Differing pixels
- 4,825
- Max channel delta
- 221
font-size:small✓pixel-exact
Our renderChrome660 pixels differ from Chrome, the largest by 45 of 255 on one channel.
- Differing pixels
- 660
- Max channel delta
- 45
font-size:math✕parsed, no effect
Our renderChrome42,129 pixels differ from Chrome, the largest by 238 of 255 on one channel.
- Differing pixels
- 42,129
- Max channel delta
- 238
font-size:medium✓pixel-exact
Our renderChrome866 pixels differ from Chrome, the largest by 45 of 255 on one channel.
- Differing pixels
- 866
- Max channel delta
- 45
font-size:large✓pixel-exact
Our renderChrome998 pixels differ from Chrome, the largest by 45 of 255 on one channel.
- Differing pixels
- 998
- Max channel delta
- 45
font-size:larger✕renders differently
Our renderChrome16,004 pixels differ from Chrome, the largest by 238 of 255 on one channel.
- Differing pixels
- 16,004
- Max channel delta
- 238
font-size:20px✓pixel-exact
Our renderChrome1,204 pixels differ from Chrome, the largest by 45 of 255 on one channel.
- Differing pixels
- 1,204
- Max channel delta
- 45
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 |
|---|---|
| xx-small | ✓pixel-exact |
| x-small | ✓pixel-exact |
| small | ✓pixel-exact |
| large | ✓pixel-exact |
| x-large | not measured |
| xx-large | ✕renders differently |
| xxx-large | ✕renders differently |
| larger | ✕renders differently |
| smaller | ✕renders differently |
| 20px | ✓pixel-exact |
| 50% | ✓pixel-exact |
| math | ✕parsed, no effect |
| medium | ✓pixel-exact |
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