Measure angles in the browser.

ORIGINAL chrome extension: https://chrome.google.com/webstore/detail/protractor/kpjldaeddnfokhmgdlmpdlecmobaonnj?hl=en

All internal operations are performed in radians.

All internal operations use the viewport coordinate environment: - +X to the right - -X to the left - +Y downwards - -Y upwards - Clockwise rotation