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Added a desired use case for HTML extension
# Provide a way to allow pointer events to be "caught" by an element even when it is invisible to the user.
# Provide a way to allow pointer events to go "through" areas of an element that are transparent, clipped/masked out, or otherwise not visible to users/viewers, while allowing pointer events to be "caught" by parts of the element that are.
# Provide a way to filter which pointer events are intercepted by an element. For example, to specify that an element should intercept most pointer events, but not mouse wheel events. This would allow elements with fixed position to pass wheel events on to the elements below them.
== The effect of clipping and masking ==
