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gecko-dev/layout/docs/LayoutDebugger.md

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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]