CODE EXAMPLE FOR HTML

sdfdfsdfsd

/* DOM Manipulation
* If you want to update / add single style in DOM Element style attribute you can use this function:
* inject javascript after page reloads.
*/
 
function setCssStyle(el, style, value) {
  var result = el.style.cssText.match(new RegExp("(?:[;s]|^)(" +
      style.replace("-", "-") + "s*:(.*?)(;|$))")),
    idx;
  if (result) {
    idx = result.index + result[0].indexOf(result[1]);
    el.style.cssText = el.style.cssText.substring(0, idx) +
      style + ": " + value + ";" +
      el.style.cssText.substring(idx + result[1].length);
  } else {
    el.style.cssText += " " + style + ": " + value + ";";
  }
}
var element = document.getElementById("wallIframe");
setCssStyle(element, "display","none !important");