placeholder.js

HTML5 has a great placeholder attribute.

  <input placeholder = "inbox@disney.com"> 

Now it works only in webkit-browsers (Safari, Google Chrome).
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Using JS, without reinventing bicycles , placeholder.js makes this attribute cross-browser.

  <input placeholder = "inbox@disney.com" id = "some_input">
 <script type = "text / javascript">
   inputPlaceholder (document.getElementById ('some_input'))
 </ script> 

placeholder.js (1.3 kilobytes)