These days the canonical pretty-printer for JavaScript is prettier: https://github.com/prettier/prettier

The canonical linter is ESLint: https://eslint.org/

ESLint is an extremely fine-tuneable linter. Perhaps the best strategy is to start with the "recommended" preset and then layer things on as desired. Especially things which are auto-fixable are low cost because then you can just run `eslint --fix` and it will automatically fix your source files. See the rule reference at https://eslint.org/docs/rules/.

Also useful in a WPT context is https://github.com/BenoitZugmeyer/eslint-plugin-html/

It looks like running prettier on .html files is not fully worked out :-/. https://github.com/prettier/prettier/issues/1674 So this might require some scripting. Brief discussion in https://github.com/w3c/web-platform-tests/pull/6287#issuecomment-310299775 . A tool using jsdom would indeed be pretty quick to code up here (https://github.com/tmpvar/jsdom).

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

This is probably better for the WPT issue tracker anyway.