title: First day of week from HTML5 Intl API
body: <p>Is there a way to get the first day of the week (Sunday or Monday for most countries) from the HTML5 internationalization API?</p>
  
  <p>The spec can be found <a href="http://www.ecma-international.org/ecma-402/1.0/" rel="noreferrer">here</a>. I would be surprised if it's not somehow disclosed, but I can't seem to find where.</p>