javascript - How to tell what fraction of element is inside viewport? -

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how determine percentage of dom element inside current viewport ? want calculate ratio of area of element inside viewport , total area of element.

related question: how tell if dom element visible in current viewport?

see getboundingclientrect , window.innerheight.

let {top, height} = element.getboundingclientrect(),     percentvisible = math.max(0, math.min(1, (window.innerheight - top) / height));

i'm guessing @ use case, in modern browsers, see intersectionobserver , intersectionratio.


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