<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8"/>
    <title>lspace/rspace default value for unknown operators (reference)</title>
    <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
    <style>
      math {
          font: 100px/1 Ahem;
      }
      mo {
          color: blue;
      }
    </style>
  </head>
  <body>
    <p>This test passes if on each row, the space around the blue rectangle
      is 0.2777777777777778em.</p>
    <p>
      <math>
        <mrow>
          <mn>p</mn>
          <mo lspace="0.2777777777777778em" rspace="0.2777777777777778em">X</mo> <!-- Single character -->
          <mn>p</mn>
        </mrow>
      </math>
    </p>
    <p>
      <math>
        <mrow>
          <mn>p</mn>
          <mo lspace="0.2777777777777778em" rspace="0.2777777777777778em">XX</mo> <!-- Multiple characters -->
          <mn>p</mn>
        </mrow>
      </math>
    </p>
    <p>
      <math>
        <mrow>
          <mn>p</mn>
          <mo form="infix" lspace="0.2777777777777778em" rspace="0.2777777777777778em">X</mo> <!-- Explicit form -->
          <mn>p</mn>
        </mrow>
      </math>
    </p>
  </body>
</html>
