I removed Internet Explorer 4 support but I modified a lot of common prototyes to make them faster, more standard and more scalable than ever.
You can use, for example, every JS 1.6+ Array.prototype with HTMLCollections too as it's possible from many Years with FireFox or Safari:
I fixed different standard behaviours and I implemented setTimeout and setInterval.
This is the last chance to have a more standard Internet Explorer implementation because if We need to wait their fixes We should go better to sleep.
Have fun with JSL Revision and a quite real ECMAScript 3rd Edition enviroment.