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Screenshot of the linked demo. Shows 4 examples in 4 cases: no mask, mask without mask-clip: no-clip and mask with mask-clip: no-clip. In the first case, the blur resulting from a filter, box-shadow and a pseudo can be seen outside the element's border-box. In the second case, we have an area inside the element masked out and all of the above that's outside the element's border-box is cut out too.In the third case, we have an area inside an element, but the blur, box-shadow and pseudo are still visible outside the element's border-box.