simple-element-resize-detector
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Resize events only work if iframe in viewport
The solution of top:-100%; and margin:1px 0 0; does not keep the iframe positioned in a viewable area at all times. If the target element is nested in an element with overflow: hidden and the target element has a negative top margin or a negative absolute positioned top the resize events stop working.
top: 0; z-index: -1 seems to fix the issue but I'm not sure what all the consequences are.
Possible solution might be to use position:fixed and the z-index? It'll still be clipped, but being in a new stacking context will make it so browsers can't guarantee it's out of viewport.
Thanks! Unfortunately we don't use it anymore in the Vimeo player. A sweet fix if that works though!