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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo
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dom/base/test/intersectionobserver_iframe.html
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dom/base/test/intersectionobserver_iframe.html
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<!DOCTYPE HTML>
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<html>
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<head>
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<style>
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#target5 {
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position: absolute;
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top: 0px;
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left: 0px;
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width: 20px;
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height: 20px;
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background: #f00;
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}
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</style>
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<body>
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<div id="target5"></div>
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<script>
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var io = new IntersectionObserver(function (records) {
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window.parent.postMessage(records[0].rootBounds == null, 'http://mochi.test:8888');
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}, {});
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io.observe(document.getElementById("target5"));
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</script>
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</body>
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</html>
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