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<!DOCTYPE html>
<html>
  <head>
    <title>Horizontal stretching of equal of U+003D EQUAL SIGN with default font (reference)</title>
  </head>
  <body>
    <math>
      <munder>
        <mi>AVERYLONGBASE</mi>
        <mo stretchy="false">=</mo>
      </munder>
    </math>
  </body>
</html>