Function extend_IE8

src/prototype/dom/dom.js:3271–3282

(element)

  // of Element.extend that acts like Prototype.K _except_ when the element
  // is one of the problematic types.
  function extend_IE8(element) {
    if (!element || elementIsExtended(element)) return element;

    var t = element.tagName;
    if (t && (/^(?:object|applet|embed)$/i.test(t))) {
      extendElementWith(element, Element.Methods);
      extendElementWith(element, Element.Methods.Simulated);
      extendElementWith(element, Element.Methods.ByTag[t.toUpperCase()]);
    }

    return element;
  }

  // If the browser lets us extend specific elements, we can replace `extend`
  // with a thinner version (or, ideally, an empty version).