Setting properties on anonymous DOM elements through JavaScript?

Let's say I'm generating markup through server-side code. I'm generating a bunch of HTML tags but I want to add custom client-side behavior. With JavaScript (if I had a reference to the DOM node) I could have written: var myDOMNode = ... myDOMNode.myCustomAttribute = "Hi!"; Now the issue here is that I don't want to qualify every element with an unique id just to initialize data. And it's really strange to me, that there's not an easier and unobtrusive way to attach client-side behavior. If I'm remembing this correctly, this is valid IE stuff.
If I was able to do this, I should be able to access it's "data context" though the identifier 'myCustomAttribute', which is really what I want.

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