<!DOCTYPE html>
<html>
  <head>
    <title>mspace units</title>
    <style>
    body {
      zoom: 1.5;
    }
    </style>
  </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>
