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Konrad Dziekonski7,798 Points
In the video, when Guil resizes his browser in bottom right corner the dimensions showes up. How can i do that and what is the difference between window size and viewport size?
Developer tools can be configured to allow you to see dimensions like that. How to do that will depend on what browser you're using. Check out the documentation for setting that up in Firefox, or this answer on StackOverflow for how to do it in Chrome.
In terms of what size terms mean in this context...
Viewport is your device's screen size. If you're in full screen mode, this is likely the same as the
Window is the current size of your browser window. This might be the same as
viewport, or it might be smaller.
Document is the size of the webpage. This could potentially be bigger than
window, or even bigger than
Hopefully that clears some things up, but let me know if you still have questions or if you need help getting rulers set up in your specific browser. Happy coding!