readonly on input type="text" gives error

Hello there,
I just started noticing that if i have an input of type text and the readonly attribute present, it gives an error.  Not sure why this is happening.
sample HTML:
<!DOCTYPE html><html><head><title>test</title></head><body><input type="text" readonly="readonly" /></body></html>

Thanks,Jade 		 	   		  

Received on Tuesday, 16 April 2013 07:44:04 UTC