<!DOCTYPE html>
<html>
<head>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
  </style>
</head>
<body>
  <p>You should see no red boxes below</p>
  <svg width="600" height="300" viewBox="0 0 600 300">
    <rect width="120" height="60" fill="green" />
    <rect x="150" y="0" width="120" height="60" fill="green" />
    <rect x="300" y="0" width="120" height="60" fill="green" />
    <rect y="90" width="120" height="60" fill="green" />
    <rect x="150" y="90" width="120" height="60" fill="green" />
  </svg>
</body>
</html>