Because IE has an incomplete implementation of DOM 1+, so that only the DOM 0 syntax is crossbrowser in case of style attribute
obj.style.CSSattribute=’value’
Regarding the HTML compounded attributes, IE needs the camelcase syntax
obj.setAttribute(’bgColor’,’value’)
obj.setAttribute(’colSpan’,’value’)
obj.setAttribute(’readOnly’,’readonly’)
and so on. Moz accepts camelcase as well, thus camelcase is crossbrowser.

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