Please extend this list for a better breaking-change-log. Describe the changed object/method/argument and add a 1.11 example and the according 1.2 code if possible.

• Upgrading to MooTools 1.2 – Tips, Tricks, and Backwards Compatibility (siafoo.net)

• 1.11
  1. window.ie6
• 1.2
  1. Browser.Engine.trident4

• 1.11
  1. el.getTag()
  2. el.setHTML(string|array)
  3. el.getText()
  4. el.setText(string)
  5. el.setOpacity(number)
  6. el.remove()
  7. el.replaceWith(element)
  8. el.effects(obj)
  9. $E(selector)
  10. $ES(selector)
  11. el.getSize().size.x/ el.getSize().size.y
• 1.2
  1. el.get('tag')
  2. el.set('html', string|array)
  3. el.get('text')
  4. el.set('text', string)
  5. el.set('opacity', number)
  6. el.dispose()
  7. element.replaces(el) // note: inverts positions of element and el
  8. new Fx.Morph(el, obj)
  9. document.getElement(selector)
  10. document.getElements(selector)
  11. el.getSize().x/ el.getSize().y

• 1.11
  1. [].copy(start, length)
  2. [].remove(item)
  3. [].merge([])
  4. [].test([])
• 1.2
  1. removed in favour of $A and [].slice
  2. [].erase(item)
  3. [].combine([])
  4. [].contains([])

• 1.11
  1. fn.bindAsEventListener(object, array)
  2. Function.empty/Class.empty
• 1.2
  1. removed, since every addEvent callback has an event
  2. $empty

Missing …

• 1.11
  1. $('myform').send([options]);
  2. new XHR({[options]}).send(url[, datastring]);
• 1.2
  1. $('myform').set('send',[options]).send();
  2. new Request({'url':url[, options]}).send([datastring]);

• 1.11
  1. Cookie.set(key, value[, options]);
  2. Cookie.get(key)
  3. Cookie.remove(cookie[, options]);
• 1.2
  1. Cookie.write(key, value[, options]);
  2. Cookie.read(key)
  3. Cookie.dispose(cookie[, options]);

• 1.11
  1. Json.evaluate(string)
  2. Json.toString(mixed)
• 1.2
  1. JSON.decode(string, secure)
  2. JSON.encode(mixed)

• 1.11
  1. Element.extend(object), String.extend(object)
  2. window.extend(object)/document.extend(object)
• 1.2
  1. String.implement(object)/String.implement(string, function)
  2. Window.implement(object)/Document.implement(string, function)

• 1.11
  • FX.Style
    1. new Fx.Style(element, property [, options]).start([from,] to);
    2. $(element).effect(property [, options]).start([startvalue,] endvalue);

• 1.2
  • FX.Tween
    1. new Fx.Tween(element [, options]).start([property], from[, to]);
    2. $(element).get(property [, options]).start(startvalue[, endvalue]);

• 1.11
  1. new Drag.Base(el[, options]);
• 1.2
  1. new Drag(el[, options]);