gistfile1.js

@Raynos
("textContent" in Element.prototype) || Object.defineProperty(Element.prototype, "textContent", {
  get: function () { return this.innerText; },
  set: function (v) { this.innerText = v; }
});

@Zirak
var getText = (function () {
    var textProp = 'textContent' in document.createElement( 'div' ) ? 'textContent' : 'innerText';

    return function ( elem ) {
        return elem[ textProp ];
    };
}());