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Adding "flashlight effect" but with white "darkness"
(programming.dev)
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I would use z-indexes to setup the layering. Have a base layer, the “filter” layer, and then the ui on top.
Basically 3 divs, with z-index 1/2/3 respectively. Put elements on the base layer or ui layer based on if you should see them always or not.
For the filter, I would do an svg of a rectangle, big enough to cover the screen, and a hole in it. Then use js to set the svg’s position relative to the mouse.
The svg could easily be made transparent, black, or even get that fade effect around the edges.