HTML email compatibility

Email clients are not browsers. Outlook on Windows renders with Microsoft Word, Gmail strips <style> blocks in some contexts, and support for anything modern is patchy and undocumented. This skill covers both halves of the problem. Write markup that survives, then verify it against real data.

scripts/caniemail.mjs queries the caniemail.com dataset. Node 24+ and nothing else, with no dependencies and no install step. It works offline against a bundled dataset snapshot, and says so when it does.

node scripts/caniemail.mjs <command> [options]

Everything it prints is JSON.

The loop