[jQuery] [validate] does maxLength(20) supported in textarea?

[jQuery] [validate] does maxLength(20) supported in textarea?

I tried to do this
<textarea id="textarea" cols="20" rows="4" name="desc" class="maxLength(20)" title="Description max length is 20"></textarea><br clear="all">
But it doesn't work.
So I guess it's not supported in textarea and I will need to add method?
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Best Regards,
Jacky
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