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<!DOCTYPE html>
<html>
<head>
<meta name="description" content="Test Table Empty Cell Computed Height">
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Test Table Empty Cell Computed Height</title>
</head>
<body>
  <table>
    <tr><td id="t2">1<br>1</td><td></td><td>3</td><td></td><td id="t0"></td></tr>
    <tr><td>1</td><td>2</td><td></td><td></td><td id="t1">5</td></tr>
  </table>
  
  <p>
    Computed height of empty table cell is <strong id="h0">?</strong>.
  </p>
  <p>
    Computed height of one-line table cell is <strong id="h1">?</strong>.
  </p>  
  <p>
    Computed height of two-line table cell is <strong id="h2">?</strong>.
  </p>
</body>
</html>
 
table {
  border-collapse: collapse;
  text-align: center;
}
​
td {
  border: 1px solid black;
  line-height: 20px;
  width: 25px;
  height: 25px;
  position: relative;
}
​
td:after {
  content: '';
  display: block;
  background: green;
  opacity: 0.25;
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}
 
var $t0 = document.getElementById('t0');
var $t1 = document.getElementById('t1');
var $t2 = document.getElementById('t2');
var $h0 = document.getElementById('h0');
var $h1 = document.getElementById('h1');
var $h2 = document.getElementById('h2');
​
$h0.textContent = window.getComputedStyle($t0).height;
$h1.textContent = window.getComputedStyle($t1).height;
$h2.textContent = window.getComputedStyle($t2).height;
​
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