Changing the zoom level of the web page modifies the screen's width/height properties. On a 1280 x 800 Macbook, Firefox reports a screen height of 800px on a 100% zoom level, which is expected. However, zooming in or out will change this value. This can be observed by opening the web console and typing `window.screen.height` or `window.screen.width`.
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**STR** 1. Navigate to this JSFiddle: https://jsfiddle.net/dc5vensr/2/ 2. Zoom the page document via `CMD+z` or going to `View`->`Zoom` and selecting either "Zoom-in" or "Zoom-out" menu items. 3. Observe the values displayed for `outerWidth`, `outerHeight`, `screen.width`, and `screen.height` displayed in the JSFiddle. **ER:** These values should not be affected by zoom. **AR:** These values are being modified as the page is zoomed in or out.
**STR** 1. Navigate to this JSFiddle: https://jsfiddle.net/dc5vensr/2/ 2. Zoom the page document via `CMD+z` (on Mac) or by going to `View`->`Zoom` and selecting either "Zoom-in" or "Zoom-out" menu items. 3. Observe the values displayed for `outerWidth`, `outerHeight`, `screen.width`, and `screen.height` displayed in the JSFiddle. **ER:** These values should not be affected by zoom. **AR:** These values are being modified as the page is zoomed in or out.
**STR** 1. Navigate to this JSFiddle: https://jsfiddle.net/dc5vensr/2/ 2. Zoom the page document via `CMD+z` (on Mac) or by going to `View`->`Zoom` and selecting either "Zoom-in" or "Zoom-out" menu items. 3. Observe the values displayed for `outerWidth`, `outerHeight`, `screen.width`, and `screen.height` in the JSFiddle. **ER:** These values should not be affected by zoom. **AR:** These values are being modified as the page is zoomed in or out.