autocomplete=off

I apologise if this has been covered before, but I'm trying to code a
page with a textbox for entering credit card numbers.
 
It remembers previous entries unless I use the autocomplete=off
attribute, but that isn't valid XHTML. Are there plans to introduce this
or something similar to the next version, as the only 'valid' way I can
find is javascript and we don't want to be relying on that!
 
Thanks,
 
Andy.

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