Bold text in the from field: <input>?

Today when I filled my calendar at google I saw that the description of the event is in bold font:

<input id=":g" name=":g" type="text" class="textinput" dir="ltr">

Is it possible to render the custom text style in the text input field?

Thanks Arman.

EDIT Simple search I fond that the jquery watermark plugin can do similar thing.