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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  <div id="a"></div>
  <div id="b"></div>
  <div id="c"></div>
</body>
</html>
 
var io = new IntersectionObserver(
    entries => {
      entries.forEach(i => {
        console.log('Time: ' + i.time);
        console.log('Target: ' + i.target);
        console.log('IntersectionRatio: ' + i.intersectionRatio);
        console.log('rootBounds: ' + i.rootBounds);
        console.log(i.boundingClientRect);
        console.log(i.intersectionRect);
        console.log('================');
      });
    },
    {
        /* Using default options. Details below */
    }
);
// Start observing an element
io.observe(document.querySelector('#a'));
io.observe(document.querySelector('#b'));
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ruanyfpro
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