<!DOCTYPE html>
<html>

<head>
    <title>mspace</title>
</head>

<body>

  <math style="position: absolute; top: 0; left: 0;">
    <mtext>
      <span style="display: inline-block; width: 5em; height: 10px;
		   background:red;"></span>
    </mtext>
  </math>

  <math style="position: absolute; top: 10px; left: 0;">
    <mtext>
      <span style="display: inline-block; width: 60pt; height: 10px;
		   background:green;"></span>
    </mtext>
  </math>

  <math style="position: absolute; top: 20px; left: 0;">
    <mtext>
      <span style="display: inline-block; width: 5pc; height: 10px;
		   background:blue;"></span>
    </mtext>
  </math>

  <math style="position: absolute; top: 30px; left: 0;">
    <mtext>
      <span style="display: inline-block; width: 10ex; height: 10px;
		   background:red;"></span>
    </mtext>
  </math>

  <math style="position: absolute; top: 40px; left: 0;">
    <mtext>
      <span style="display: inline-block; width: 50px; height: 10px;
		   background:green;"></span>
    </mtext>
  </math>

  <math style="position: absolute; top: 50px; left: 0;">
    <mtext>
      <span style="display: inline-block; width: 1in; height: 10px;
		   background:blue;"></span>
    </mtext>
  </math>

  <math style="position: absolute; top: 60px; left: 0;">
    <mtext>
      <span style="display: inline-block; width: 2.54cm; height: 10px;
		   background:red;"></span>
    </mtext>
  </math>

  <math style="position: absolute; top: 70px; left: 0;">
    <mtext>
      <span style="display: inline-block; width: 25.4mm; height: 10px;
		   background:green;"></span>
    </mtext>
  </math>

</body>

</html>
