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documentElement.clientHeight returns full content height · Issue #257 · w3c/IntersectionObserver · GitHub
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Description
When using the polyfill my entries always have an intersectionRatio of 1. I've just spend some time debugging it, and after some time I figured the problem is in the following part of _getRootRect():
...
// Use <html>/<body> instead of window since scroll bars affect size.
var html = document.documentElement;
var body = document.body;
rootRect = {
top: 0,
left: 0,
right: html.clientWidth || body.clientWidth,
width: html.clientWidth || body.clientWidth,
bottom: html.clientHeight || body.clientHeight,
height: html.clientHeight || body.clientHeight
};
...
It defaults to use document.documentElement.clientHeight which in my case returns the full height of all content, whereas document.body.clientHeight will return the height of the viewport (which I guess is the intention).
Switching to prefer body over documentElement, makes the polyfill work for me. Can anyone ellaborate on why to use documentElement?
MouradouchaneMouradouchane
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