Does ReflowPDF support the CSS property text-underline-offset?

renders differently: The property takes effect, but our pixels are not Chrome's. The difference map on this page shows where. Measured against Chrome on 6 examples; the renders and the difference maps are published at https://reflowpdf.com/conformance/css/text-underline-offset.

Dataset 20260827-2142-2f1b575 · measured 2026-08-27 21:42 UTC

text-underline-offset

✕renders differentlycss-text-decor-4

The property takes effect, but our pixels are not Chrome's. The difference map on this page shows where.

What the specification says

Initial value: auto
Applies to: all elements
Inherited: yes
Percentages: N/A
Computed value: as specified, with <length-percentage> values computed
Syntax: auto | <length-percentage>

css-text-decor-4 definition

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.

text-underline-offset:50%✓pixel-exact

Chrome of this test — Left of the line is our rendering; right of it is the chrome. Drag, or focus the slider and use the arrow keys.

Our render of this test — Left of the line is our rendering; right of it is the chrome. Drag, or focus the slider and use the arrow keys.

1,409 pixels differ from Chrome, the largest by 45 of 255 on one channel.

Differing pixels: 1,409
Max channel delta: 45

the example page

text-underline-offset:20px✓pixel-exact

1,364 pixels differ from Chrome, the largest by 45 of 255 on one channel.

Differing pixels: 1,364
Max channel delta: 45

the example page

text-underline-offset:40%✕renders differently

1,924 pixels differ from Chrome, the largest by 46 of 255 on one channel.

Differing pixels: 1,924
Max channel delta: 46

the example page

text-underline-offset:4px✓pixel-exact

1,402 pixels differ from Chrome, the largest by 45 of 255 on one channel.

Differing pixels: 1,402
Max channel delta: 45

the example page

text-underline-offset:calc(20px + 4px)✓pixel-exact

1,364 pixels differ from Chrome, the largest by 45 of 255 on one channel.

Differing pixels: 1,364
Max channel delta: 45

the example page

text-underline-offset:calc(40% + 20px)✓pixel-exact

1,414 pixels differ from Chrome, the largest by 67 of 255 on one channel.

Differing pixels: 1,414
Max channel delta: 67

the example page

Which values were measured

“Supported” on one example means “supported at the value we tried”. The property’s declared grammar has 3 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	✓pixel-exact
50%	✕renders differently
auto	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

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Value

Measured

20px

✓pixel-exact

50%

✕renders differently

auto

not measured