This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
The order in this collection represents the order of the values in the CSS style
property. If the index is greater than or equal to the number of values in the list,
this method returns
var cssValue = cssValueList.item(index);
unsigned longrepresenting the index of the CSS value within the collection.
CSSValue object at the
index position in the
null if that is not a valid index.
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