TLDR
The Pointer Lock API provides input methods based on the movement of the mouse over time (i.e., deltas), not just the absolute position of the cursor in the viewport. It gives you access to raw mouse movement, locks the target of mouse events to a single element, eliminates limits on how far mouse movement can go in a single direction, and removes the cursor from view. It is ideal for first person 3D games, for example. The API is useful for applications that require significant mouse input to control movements.via the TL;DR App
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