Does ReflowPDF support the CSS property scrollbar-gutter?

not implemented: The engine's CSS parser does not know this property name, so the declaration is dropped where it is read. Measured against Chrome on 1 example; the renders and the difference maps are published at https://reflowpdf.com/conformance/css/scrollbar-gutter.

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

scrollbar-gutter

–not implementedcss-overflow-3

The engine's CSS parser does not know this property name, so the declaration is dropped where it is read.

What the specification says

Initial value: auto
Applies to: scroll containers
Inherited: no
Percentages: n/a
Computed value: specified keyword(s)
Syntax: auto | stable && both-edges?

css-overflow-3 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.

scrollbar-gutter:stable both-edges–not implemented

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.

2,166 pixels differ from Chrome, the largest by 238 of 255 on one channel.

Differing pixels: 2,166
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; 1 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
stable	not measured
stable both-edges	–not implemented
auto	not measured

Tests in the suite that name this property

Secondary evidence: 16 Web Platform Tests 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.

✓css/css-overflow/overflow-auto-scrollbar-gutter-intrinsic-001.html ✓css/css-overflow/overflow-auto-scrollbar-gutter-intrinsic-002.html ✓css/css-overflow/overflow-auto-scrollbar-gutter-intrinsic-003.html ✓css/css-overflow/scrollbar-gutter-002.html ✓css/css-overflow/scrollbar-gutter-003.html –css/css-overflow/scrollbar-gutter-dynamic-001.html –css/css-overflow/scrollbar-gutter-dynamic-002.html –css/css-overflow/scrollbar-gutter-dynamic-003.html –css/css-overflow/scrollbar-gutter-dynamic-004.html ✕css/css-overflow/scrollbar-gutter-root-both-edges.html ✓css/css-overflow/scrollbar-gutter-root.html ✓css/css-overflow/scrollbar-gutter-rtl-002.html

+ 4 more

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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