mozilla-firefox/firefox

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Sylvestre Ledru 2d7a50738b Bug 2040162 - Apply rumdl fixes to layout/docs r=layout-reviewers,emilio DONTBUILD

Differential Revision: https://phabricator.services.mozilla.com/D301169

2026-05-19 08:17:55 +00:00

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Layout Debugger

Overview

The layout debugger can dump a variety of things including:

Matched CSS Rules
Text Runs
Frames

Usage

Use a debug build or add ac_add_options --enable-layout-debugger to your mozconfig.
Run with ./mach run --layoutdebug [filename]