On most of Google pages they allow to give feedback that also takes a screenshot of your active screen to help the feedback, but how do they take a screenshot without using UserMedia.<p>https://cloud.google.com/compute/docs/<p>You have to give 3 stars or less to get a prompt to give feedback and then you can click either and it takes a screenshot.
stackoverflow discussion: <a href="http://stackoverflow.com/questions/4912092/using-html5-canvas-javascript-to-take-screenshots" rel="nofollow">http://stackoverflow.com/questions/4912092/using-html5-canva...</a><p>slides from a member of the feedback team: <a href="https://www.elliottsprehn.com/preso/fluentconf/" rel="nofollow">https://www.elliottsprehn.com/preso/fluentconf/</a><p>relevant JS library: <a href="https://github.com/niklasvh/feedback.js" rel="nofollow">https://github.com/niklasvh/feedback.js</a>