4 ms·

Same for me, I can see my wallpaper and desktop icons. Very strange. Wonder if this is a risk for being exploited somehow to take photos of people's desktops

• ta_2325r9e 5y ago
  I wrote a simple HTML and JS to test if that's possible: Load this GIF, then draw it into a canvas using drawImage[1], then read the canvas content with getImageData. Luckily it returns an array of zeros, so it at least not trivially exploitable. [1] https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/drawImage https://developer.mozilla.org/en-US/docs/Web/API/CanvasRende... [2] https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/getImageData https://developer.mozilla.org/en-US/docs/Web/API/CanvasRende...
  • Arnavion 5y ago
    The browser is rendering that region of its window as transparent, and the display compositor is obliging by showing the layers below the browser window. The browser window itself doesn't know anything about the pixels of the layers below it. So anything that looks at the browser window, like canvas.getImageData will not return those pixels. However screen-sharing API like getDisplayMedia() will screencopy at the compositor level, so they will include those pixels depending on what you choose to share.