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hnl.isVisible.js - jquery extension to check if an element is visible in the browser's viewport, demo:
$.fn.isVisible = function() {
// Am I visible?
// Height and Width are not explicitly necessary in visibility detection, the bottom, right, top and left are the
// essential checks. If an image is 0x0, it is technically not visible, so it should not be marked as such.
// That is why either width or height have to be > 0.
var rect = this[0].getBoundingClientRect();
return (
(rect.height > 0 || rect.width > 0) &&
rect.bottom > 0 &&
rect.right > 0 && < (window.innerHeight || document.documentElement.clientHeight) &&
rect.left < (window.innerWidth || document.documentElement.clientWidth)
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