This method will be called when an element for which the validator is registered is to be validated. If the supplementary validator finds an error it simply needs to report it via the given error reporter.
Implementations must not invoke the {@link ErrorReporter#validationStarted} and{@link ErrorReporter#validationCompleted} methods as the{@link DOMValidator} that manages the supplementary validators isrepsonsible for invoking these methods.
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