Does ReflowPDF support the CSS property letter-spacing?

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/letter-spacing.

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

letter-spacing

✕renders differentlycss-text-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: normal
Applies to: inline boxes and text
Inherited: yes
Percentages: relative to used font-size
Computed value: an absolute length and/or a percentage
Syntax: normal | <length-percentage>

css-text-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.

letter-spacing:20px✕renders differently

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.

12,493 pixels differ from Chrome, the largest by 221 of 255 on one channel.

Differing pixels: 12,493
Max channel delta: 221

the example page

letter-spacing:50%✕renders differently

25,848 pixels differ from Chrome, the largest by 238 of 255 on one channel.

Differing pixels: 25,848
Max channel delta: 238

the example page

letter-spacing:40%✕renders differently

6,832 pixels differ from Chrome, the largest by 32 of 255 on one channel.

Differing pixels: 6,832
Max channel delta: 32

the example page

letter-spacing:4px✕renders differently

6,816 pixels differ from Chrome, the largest by 32 of 255 on one channel.

Differing pixels: 6,816
Max channel delta: 32

the example page

letter-spacing:calc(40% + 20px)✕renders differently

42,714 pixels differ from Chrome, the largest by 238 of 255 on one channel.

Differing pixels: 42,714
Max channel delta: 238

the example page

letter-spacing:calc(20px + 4px)✕renders differently

38,602 pixels differ from Chrome, the largest by 238 of 255 on one channel.

Differing pixels: 38,602
Max channel delta: 238

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	✕renders differently
50%	✕renders differently
normal	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

✕renders differently

50%

✕renders differently

normal

not measured