Allowed Element property value's?

While debugging, I have a dom Element that looks like (Element.toString()):

<span id="_TxMrk_19" key="amt"></span>

When reading the property value I get the following:

element.getPropertyString("id")  ->  "_TxMrk_19"
element.getPropertyString("key")  -> null

Why does reading the "key" property value returns in null? (I would expect "amt")...

(using gwt. 2.5.1 in dev mode against FF, with plugin).

- Ed

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