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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 class="a"></div>
  
  <div class="b"></div>
  
</body>
</html>
 
window.addEventListener('scroll', function () {
var b = document.querySelector('.b').getBoundingClientRect();
var a = document.querySelector('.a').getBoundingClientRect();
  
  if (b.top <= a.top + a.height && b.top + b.height > a.top) {
    console.log('overlap');
  }
});
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anonymouspro
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