NekR/gist:5748541

## gistfile1.html
<!doctype html>
<html>
  <head>
    <meta charset="utf-8">
    <script>
      (function() {
        var disabled = (function() {
          var button = document.createElement('button'),
            fieldset,
            handlesEvents,
            handlesEventsWrapped,
            e;

          var TEST_EVENT_NAME = 'test';

          var eventHandler = function() {
            handlesEvents = true;
          },
          wrappedEventHandler = function() {
            handlesEventsWrapped = true;
          };

          button.disabled = true;
          document.documentElement.appendChild(button);

          button.addEventListener(TEST_EVENT_NAME, eventHandler, false);

          e = document.createEvent('CustomEvent');
          e.initCustomEvent(TEST_EVENT_NAME, false, false, 1);
          button.dispatchEvent(e);
          button.removeEventListener(TEST_EVENT_NAME, eventHandler, false);

          if (!handlesEvents) {
            fieldset = document.createElement('fieldset');
            fieldset.disabled = true;
            fieldset.appendChild(button);
            document.documentElement.appendChild(fieldset);

            button.disabled = false;
            button.addEventListener(TEST_EVENT_NAME, wrappedEventHandler, false);

            e = document.createEvent('CustomEvent');
            e.initCustomEvent(TEST_EVENT_NAME, false, false, 1);
            button.dispatchEvent(e);
            button.removeEventListener(TEST_EVENT_NAME, wrappedEventHandler, false);

            document.documentElement.removeChild(fieldset);
          } else {
            document.documentElement.removeChild(button);
            handlesEventsWrapped = true;
          }

          return {
            handlesEvents: handlesEvents,
            handlesEventsWrapped: handlesEventsWrapped
          };
        }());

        if (disabled.handlesEvents) return;

        var getNative = function() {
          var result;

          ['EventTarget', 'Node', 'Element'].some(function(interface) {
            var desc;
            interface = window[interface];

            if (interface && (desc = Object.getOwnPropertyDescriptor(
                interface.prototype, 'dispatchEvent'))) {
              result = {
                interface: interface,
                desc: desc
              };

              return true;
            }
          });

          return result;
        };

        var native = getNative(),
          nativeDispatch = native.desc,
          blockedEvents = {
            click: 1
          };

        var dispatchEvent = function(event, handler, capture) {
          var node = this,
            disabledDesc,
            disabledChanged,
            disabledChangedVal = true,
            disabledFix,
            result;

          if (!node.disabled || blockedEvents.hasOwnProperty(event)) {
            return nativeDispatch.value.apply(this, arguments);
          }

          disabledDesc = Object.getOwnPropertyDescriptor(
              // Firefox
              Object.getPrototypeOf(node),
              'disabled'
              // IE
            ) || Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'disabled');

          if (disabledDesc && disabledDesc.set && disabledDesc.get &&
              !Object.getOwnPropertyDescriptor(node, 'disabled')) {
            disabledFix = true;
            node.disabled = false;
            console.log('used fix');

            Object.defineProperty(node, 'disabled', {
              enumerable: disabledDesc.enumerable,
              configurable: disabledDesc.configurable,
              set: function(val) {
                disabledChanged = true;
                disabledChangedVal = !!val;
              },
              get: function() {
                return disabledChangedVal;
              }
            });
          }

          result = nativeDispatch.value.apply(this, arguments);

          if (disabledFix) {
            delete node.disabled;
            node.disabled = disabledChanged ? disabledChangedVal : true;
          }

          return result;
        };

        Object.defineProperty(native.interface.prototype, 'dispatchEvent', {
          value: dispatchEvent,
          writable: nativeDispatch.writable,
          configurable: nativeDispatch.configurable,
          enumerable: nativeDispatch.enumerable
        });

        if (disabled.handlesEventsWrapped) return;

        // Here should be fix for elements wrapped with some others disabled elements
        // <fieldset disabled>
        //   <button disabled></button>
        // </fieldset>
      }());
    </script>
  </head>
  <body>
    <form>
      <button id="test" disabled>test</button>
    </form>
    <script>
      var button = document.querySelector('#test');

      button.addEventListener('test', function() {
        console.log('test', this.disabled);
        this.disabled = true;
        var e = document.createEvent('CustomEvent');
        e.initCustomEvent('test2', false, false ,1);
        button.dispatchEvent(e);
      });

      button.addEventListener('test2', function() {
        console.log('test2', this.disabled);
        this.disabled = true;
        var e = document.createEvent('CustomEvent');
        e.initCustomEvent('test3', false, false ,1);
        button.dispatchEvent(e);
      });

      button.addEventListener('test3', function() {
        console.log('test3', this.disabled);
        this.disabled = false;
      });


      var e = document.createEvent('CustomEvent');
      e.initCustomEvent('test', false, false ,1);
      button.dispatchEvent(e);

      console.log('final disabled', button.disabled);
    </script>
  </body>
</html>
	<!doctype html>
	<html>
	<head>
	<meta charset="utf-8">
	<script>
	(function() {
	var disabled = (function() {
	var button = document.createElement('button'),
	fieldset,
	handlesEvents,
	handlesEventsWrapped,
	e;

	var TEST_EVENT_NAME = 'test';

	var eventHandler = function() {
	handlesEvents = true;
	},
	wrappedEventHandler = function() {
	handlesEventsWrapped = true;
	};

	button.disabled = true;
	document.documentElement.appendChild(button);

	button.addEventListener(TEST_EVENT_NAME, eventHandler, false);

	e = document.createEvent('CustomEvent');
	e.initCustomEvent(TEST_EVENT_NAME, false, false, 1);
	button.dispatchEvent(e);
	button.removeEventListener(TEST_EVENT_NAME, eventHandler, false);

	if (!handlesEvents) {
	fieldset = document.createElement('fieldset');
	fieldset.disabled = true;
	fieldset.appendChild(button);
	document.documentElement.appendChild(fieldset);

	button.disabled = false;
	button.addEventListener(TEST_EVENT_NAME, wrappedEventHandler, false);

	e = document.createEvent('CustomEvent');
	e.initCustomEvent(TEST_EVENT_NAME, false, false, 1);
	button.dispatchEvent(e);
	button.removeEventListener(TEST_EVENT_NAME, wrappedEventHandler, false);

	document.documentElement.removeChild(fieldset);
	} else {
	document.documentElement.removeChild(button);
	handlesEventsWrapped = true;
	}

	return {
	handlesEvents: handlesEvents,
	handlesEventsWrapped: handlesEventsWrapped
	};
	}());

	if (disabled.handlesEvents) return;

	var getNative = function() {
	var result;

	['EventTarget', 'Node', 'Element'].some(function(interface) {
	var desc;
	interface = window[interface];

	if (interface && (desc = Object.getOwnPropertyDescriptor(
	interface.prototype, 'dispatchEvent'))) {
	result = {
	interface: interface,
	desc: desc
	};

	return true;
	}
	});

	return result;
	};

	var native = getNative(),
	nativeDispatch = native.desc,
	blockedEvents = {
	click: 1
	};

	var dispatchEvent = function(event, handler, capture) {
	var node = this,
	disabledDesc,
	disabledChanged,
	disabledChangedVal = true,
	disabledFix,
	result;

	if (!node.disabled \|\| blockedEvents.hasOwnProperty(event)) {
	return nativeDispatch.value.apply(this, arguments);
	}

	disabledDesc = Object.getOwnPropertyDescriptor(
	// Firefox
	Object.getPrototypeOf(node),
	'disabled'
	// IE
	) \|\| Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'disabled');

	if (disabledDesc && disabledDesc.set && disabledDesc.get &&
	!Object.getOwnPropertyDescriptor(node, 'disabled')) {
	disabledFix = true;
	node.disabled = false;
	console.log('used fix');

	Object.defineProperty(node, 'disabled', {
	enumerable: disabledDesc.enumerable,
	configurable: disabledDesc.configurable,
	set: function(val) {
	disabledChanged = true;
	disabledChangedVal = !!val;
	},
	get: function() {
	return disabledChangedVal;
	}
	});
	}

	result = nativeDispatch.value.apply(this, arguments);

	if (disabledFix) {
	delete node.disabled;
	node.disabled = disabledChanged ? disabledChangedVal : true;
	}

	return result;
	};

	Object.defineProperty(native.interface.prototype, 'dispatchEvent', {
	value: dispatchEvent,
	writable: nativeDispatch.writable,
	configurable: nativeDispatch.configurable,
	enumerable: nativeDispatch.enumerable
	});

	if (disabled.handlesEventsWrapped) return;

	// Here should be fix for elements wrapped with some others disabled elements
	// <fieldset disabled>
	// <button disabled></button>
	// </fieldset>
	}());
	</script>
	</head>
	<body>
	<form>
	<button id="test" disabled>test</button>
	</form>
	<script>
	var button = document.querySelector('#test');

	button.addEventListener('test', function() {
	console.log('test', this.disabled);
	this.disabled = true;
	var e = document.createEvent('CustomEvent');
	e.initCustomEvent('test2', false, false ,1);
	button.dispatchEvent(e);
	});

	button.addEventListener('test2', function() {
	console.log('test2', this.disabled);
	this.disabled = true;
	var e = document.createEvent('CustomEvent');
	e.initCustomEvent('test3', false, false ,1);
	button.dispatchEvent(e);
	});

	button.addEventListener('test3', function() {
	console.log('test3', this.disabled);
	this.disabled = false;
	});


	var e = document.createEvent('CustomEvent');
	e.initCustomEvent('test', false, false ,1);
	button.dispatchEvent(e);

	console.log('final disabled', button.disabled);
	</script>
	</body>
	</html>