html - How does the "position: sticky;" property work? - Stack Overflow
https://stackoverflow.com/questions/43707076/how-does-the-position-sticky-property-work
WebDec 19, 2017 · Sticky positioning is a hybrid of relative and fixed positioning. The element is treated as relative positioned until it crosses a specified threshold, at which point it is treated as fixed positioned.... You must specify a threshold with at least one of top, right, bottom, or left for sticky positioning to behave as expected.
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