JSPM

hint that that checks if protocol relative URLs are used

hint that that checks if the Babel configuration is valid.

hint for best practices related to the meta viewport

hint for best practices related to HTTP redirects

hint that that checks if HTML document only response headers are sent for other resources

hint for best practices related to usage of the X-UA-Compatible meta tag and response header

hint for best practices related to the usage of the Set-Cookie response header.

hint that that checks if a web app manifest file was specified and it exists

hint that that checks if protocol relative URLs are used

hint that that validates HTML pages using the Nu HTML checker

hint that that checks if a page passes a set performance budget

hint for best practices related to the 'theme-color' meta tag

hint that that warns against using P3P

hint that that validates AMP HTML pages using the AMP Validator

Invalidate the use of CSS inline styles in HTML

webhint hint to validate Microsoft's JSLL usage.