<!DOCTYPE html> <html class="reftest-wait"> <head> <title>mo@movablelimits</title> <meta charset="utf-8"/> <script type="text/javascript"> function doTest() { document.getElementById('a').removeAttribute('movablelimits'); document.documentElement.removeAttribute("class"); } window.addEventListener("MozReftestInvalidate",doTest, false); </script> </head> <body> <math> <munder> <mo id="a" movablelimits="false">∑</mo> <mi>x</mi> </munder> </math> </body> </html>