add experimental region and insertRule

element.methods.js

@@ -1,14 +1,14 @@
 /**
- *  Element#contains(@element, pattern) -> Boolean
+ *  Element#containsText(@element, pattern) -> Boolean
  *  - @element(Element): element which content will be tested
  *  - pattern(String|RegExp): pattern to test element's content against
  *  
  *  Tests whether element's content contains specified string (or matches agains regular expression)
  *  
- *      $("myElement").contains("some text...");
- *      $("otherElement").contains(/(foo|bar)/i)
+ *      $("myElement").containsText("some text...");
+ *      $("otherElement").containsText(/(foo|bar)/i)
  **/ 
-Element.Methods.contains = function(element, pattern) { 
+Element.Methods.containsText = function(element, pattern) { 
   element = $(element);
   if (!pattern) return false;
   pattern = pattern.constructor == RegExp ? pattern : RegExp.escape(pattern);

experimental/element_region.js

@@ -0,0 +1,23 @@
+Element.Region = Class.create({
+  initialize: function(element) {
+    this.element = $(element);
+    var offset = this.element.cumulativeOffset();
+    var dim = this.element.getDimensions();
+    this.top = offset.top;
+    this.left = offset.left;
+    this.bottom = this.top + dim.height;
+    this.right = this.left + dim.width;
+  },
+  contains: function(other) {
+    return other.left >= this.left && 
+      other.right <= this.right &&
+      other.top >= this.top &&
+      other.bottom <= this.bottom;
+  },
+  intersectsWith: function(other) {
+    return ((other.left >= this.left && other.left <= this.right) ||
+      (other.right >= this.left && other.right <= this.right)) && 
+      ((other.top >= this.top && other.top <= this.bottom) ||
+      (other.bottom >= this.top && other.bottom <= this.bottom));
+  }
+});

insertRule.js

@@ -0,0 +1,24 @@
+var insertRule = (function(){
+  var ss = document.styleSheets[0],
+      reSelectorRule = /([^\{]*)\{([^\}]*)\}/;
+  if (!ss) {
+    var el = document.createElement('style');
+    el.type = 'text/css';
+    el.rel = 'stylesheet';
+    document.getElementsByTagName('head')[0].appendChild(el);
+    ss = document.styleSheets[0];
+  }
+  if (ss.addRule) {
+    return function(rule) { // IE
+      var match = rule.match(reSelectorRule);
+      if (!match) return;
+      var ss = document.styleSheets[document.styleSheets.length-1];
+      ss.addRule(match[1], match[2], ss.rules.length);
+    }
+  }
+  return function(rule) { // Others
+    if (!rule.match(reSelectorRule)) return;
+    var ss = document.styleSheets[document.styleSheets.length-1];
+    ss.insertRule(rule, ss.cssRules.length);
+  }
+})();