private attributes in chrome

Hi,
I am using private attributes and it works greate on IE, I just tested it on chrome and it apears not to be working.
How can I read my private attributes.
Example:

[code]
<script>
function f() {
alert(document.getElementById(“a”)._abc)
}
</script>
<div id=”a” _abc=”gilad”></div>
<button onClick=”f()”>click</button>
[/code]

in IE it shoes gilad in chrome undefined.

please assist,
10x

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