Prototype for extending HTMLElement capabilities of finding node by text

prototype.HTMLElement.js

HTMLElement.prototype.getElementsByInnerText = function (text, escape) {
  var nodes = this.querySelectorAll("*");
  var matches = [];
  for (var i = 0; i < nodes.length; i++) {
    if (nodes[i].innerText == text) {
      matches.push(nodes[i]);
    }
  }
  if (escape) {
    return matches;
  }
  var result = [];
  for (var i = 0; i < matches.length; i++) {
    var filter = matches[i].getElementsByInnerText(text, true);
    if (filter.length == 0) {
      result.push(matches[i]);
    }
  }
  return result;
};
document.getElementsByInnerText = HTMLElement.prototype.getElementsByInnerText;

HTMLElement.prototype.getElementByInnerText = function (text) {
  var result = this.getElementsByInnerText(text);
  if (result.length == 0) return null;
  return result[0];
}
document.getElementByInnerText = HTMLElement.prototype.getElementByInnerText;