* Let a COLOR element have a value DOM property in the DOM that returns a
color.
* Let a NUMBER element has a value DOM property that returns a number.

Actually, the latter use case is one I have bumped into:  
* The DOM does not provide a numeric value,
* JavaScript support for parsing localized properties is poor; you have to
reverse engineer the result of toLocaleString,
* VBScript support is better but inconsistent as it depends on the system
locale and not on the document locale as desired.

IMHO,
Chris


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