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I'm using a component that detects the user argent, and outputs different HTML accordingly. This seems reasonable. However - since the user-agent returned by your system doesn't pick one of the fully-supported ones (e.g. MSIE) - it falls back to assume you have an ancient browser, and emits non-modern- standard tags - like NOBR - which you then complain about. I suggest a popup (option/select) to specify which user-agent you want the validator to simulate.
working on this.
done via extra parameter: http://validator.w3.org/docs/users.html#option-user-agent Did not add to the UI since this is a rare usage that does not currently seem to justify UI clutter.