Before shipping where the browser matrix is wide.
Build a cross-browser test plan for [feature] for [browser/matrix]. Prioritize by: market share, known quirks, and feature risk. Specify what to test manually vs automated.
Anything in square brackets is meant to be replaced. The builder turns those into fields you can type into.
Tired of re-pasting the same context into every new chat? That is what the Unimatrix MCP server is for.