XLinfini/sousa-gecko

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Ting-Yu Lin 731f2b7f74 Bug 2053199 - Add AGENTS.md and CLAUDE.md for layout/. r=layout-reviewers,ai4dev-reviewers,emilio,padenot

Differential Revision: https://phabricator.services.mozilla.com/D310877

2026-07-07 21:26:32 +00:00

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Layout module instructions

Scoped guidance for layout/. The global ../AGENTS.md still applies.

Start here

Read the docs in layout/docs/ before non-trivial work.

layout/docs/LayoutOverview.md for frame tree, frame construction, reflow, and fragmentation.

Review

Read layout/docs/LayoutCodeReviewerChecklist.md as guidance when reviewing layout changes.

Testing

When adding reftests / crashtests for standardized CSS properties, prefer putting them in the relevant subdirectory of testing/web-platform/tests/css/ rather than the in-tree layout/reftests/ or the per-subdirectory layout/*/crashtests/ directories.

Debugging

Layout debugger can dump useful layout internal information for a URL. Run ./mach run --layoutdebug [filename]. Read layout/docs/LayoutDebugger.md for usage.