How limit length of the String Attribute in pulggable widget?

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How limit length of the String Attribute in pulggable widget? I see the widget  by dojo can limit length of the String Attribute， how to do this in pulggable widget？ Is there any demo 
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<input type="text" id="MyTextfieldId" name="MyTextfield" size="50">

offcourse the size can come from a parameter as long as it’s an integer

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