title: How to open a file browser with default directory in Javascript?
body: <p>I want to open a file browser in JavaScript and set a default directory to this file browser.
  For example, I will like to set the default directory to "C:\My Documents".</p>
  
  <p>How to set a default directory?
  It's better to use <code>&lt;input type="file"/&gt;</code>, other controls are ok too.</p>