<!DOCTYPE html> <html class="reftest-wait"> <head> <title>menclose top</title> <meta charset="utf-8"/> <script type="text/javascript"> function doTest() { var box = document.getElementById("box").getBoundingClientRect(); document.getElementById("path").setAttribute("d", "M" + (box.left + "," + box.top) + " " + "l" + (box.width + "," + 0)); document.documentElement.removeAttribute("class"); } window.addEventListener("MozReftestInvalidate",doTest, false); </script> </head> <body> <div style="position: absolute; left: 20px; top: 20px;"> <math> <mphantom> <menclose id="box" notation="top"> <mspace width="200px" height="100px"></mspace> </menclose> </mphantom> </math> </div> <div style="position: absolute; left: 0px; top: 0px;"> <svg width="500px" height="500px"> <path id="path" style="fill: none; stroke-width: 3px; stroke: green; stroke-linecap: round; shape-rendering: crispEdges;"></path> </svg> </div> </body> </html>