What's wrong with adding properties to DOM Element objects?

Question

I\'ve been looking for a straight answer for this (I can think of lots of possiblities, but I\'d like to know the true reason):

jQuery provides a .data() method for

Answer 1

It has to do with the fact that DOM in IE is not managed by JScript, which makes it completely different environment to access. This leads to the memory leaks http://www.crockford.com/javascript/memory/leak.html. Another reason is that, when people use innerHTML to copy nodes, all those added properties are not transfered.