This directory as well as ../cross-origin-embedder-policy/ contains tests for Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy. Some light background reading:

• COOP and COEP explained
• COOP processing model (also defines interaction with COEP)
• COEP processing model
• Open COOP issues
• Open COEP issues

Notes:

• Top-level navigation to a data: URL does not work in Chrome and Firefox and is therefore not tested. (This should probably be standardized.)