Does anyone know what its called when you have the overlay in a textbox and then when you click on the text box it disappears? I've tried searching google, but I'm not even sure what its called. What I want to use it for is a text box asking for a date and I want to show the format in the text box, but when the click on the text box to enter a date, it goes away. Thank you.
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textbox overlay suggestion 
