Can I subclass a DOM-class?

Question

I was wondering if I can create a subclass of HTMLDivElement. Like this.

MyDivElement.prototype.pickColor = function()
{
    return this.picked;
}
function M         


        

Answer 1

In browsers where __proto__ is exposed and mutable you can sub class DOM elements. It looks like this:

function CustomEl () {
    var el = document.createElement('div')
    el.__proto__ = CustomEl.prototype
    return el
}
CustomEl.prototype.__proto__ = HTMLDivElement.prototype

I also played with it in more detail on jsFiddle. Unfortunately though IE and Opera don't allow __proto__ access and have no plans to in the future as far as I know.