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<!DOCTYPE html>
<html class="reftest-wait">
<head>
<style>
#container {
border: 3px dotted black;
background: yellow;
overflow: hidden;
width: 400px;
max-height: 25px;
}
#container.masked {
mask: url('#fade_mask_bottom');
}
.item {
font-size: 30px;
}
</style>
<script>
function go() {
clear();
insert();
}
function clear() {
// Force reflow:
container.offsetHeight;
// Remove mask:
container.classList.remove('masked');
}
function insert() {
// Add new child:
var notificationNode = document.createElement('div');
notificationNode.classList.add('item');
notificationNode.appendChild(document.createTextNode("PASS"));
var container = document.getElementById('container');
container.appendChild(notificationNode);
// Force reflow:
container.offsetHeight;
// Add back mask:
container.classList.add('masked');
document.documentElement.classList.remove('reftest-wait');
}
</script>
</head>
<body onload="go();">
<div id='container' class="masked"></div>
<!-- BEGIN SVG MASK: -->
<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<mask id="fade_mask_bottom"
maskUnits="objectBoundingBox" maskContentUnits="objectBoundingBox">
<linearGradient id="fade_gradient_bottom"
gradientUnits="objectBoundingBox" x2="0" y2="1">
<stop stop-color="white" stop-opacity="1" offset="0.7"></stop>
<stop stop-color="white" stop-opacity="0" offset="1"></stop>
</linearGradient>
<rect x="0" y="0" width="1" height="1"
fill="url(#fade_gradient_bottom)"></rect>
</mask>
</svg>
<!-- END SVG MASK -->
</body>
</html>
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