Blame dom/base/test/intersectionobserver_window.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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<script>
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var io = new IntersectionObserver(function(records) {
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var viewportWidth =
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document.documentElement.clientWidth || document.body.clientWidth;
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var viewportHeight =
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document.documentElement.clientHeight || document.body.clientHeight;
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var result = records.length === 1 &&
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records[0].rootBounds.top === 0 &&
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records[0].rootBounds.left === 0 &&
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records[0].rootBounds.right === viewportWidth &&
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records[0].rootBounds.width === viewportWidth &&
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records[0].rootBounds.bottom === viewportHeight &&
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records[0].rootBounds.height === viewportHeight;
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if (!result) {
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result = [records.length,
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records[0].isIntersecting,
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records[0].rootBounds.top,
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records[0].rootBounds.left,
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records[0].rootBounds.right,
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records[0].rootBounds.width,
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records[0].rootBounds.bottom,
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records[0].rootBounds.height,
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viewportWidth,
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viewportHeight].join(',');
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}
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window.opener.postMessage(result, '*');
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});
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io.observe(document.getElementById("target"));
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</script>
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</body>
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</html>
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