<style>
.c1 { transform-style: preserve-3d; display: table-row-group;</style><script>
var docElement = document.documentElement;
function init() {
test1 = document.createElementNS("http://www.w3.org/1999/xhtml", "defs");
test1.setAttribute("class", "c1");
docElement.appendChild(test1);
test2 = document.createElementNS("http://www.w3.org/1998/Math/MathML", "msub");
test1.appendChild(test2);
}
document.addEventListener("DOMContentLoaded", init);
</script>