title: Is there a way in Eclipse to change the ECMAScript compliance level?
body: <p>In Eclipse 4.5 (Mars) with installed <a href="http://www.eclipse.org/webtools/" rel="noreferrer">JavaScript Development Tools (JSDT)</a>, the default compliance level for ECMAScript is set to <code>ECMAScript 3</code>, which is already very outdated. And the related drop down list to change the compliance level is deactivated, so it's not possible to change the option. Is there a way to change those settings to a newer standard like <code>ECMAScript 5</code> or <code>ECMAScript 2015</code>?</p>
  
  <p><a href="https://i.stack.imgur.com/hUUdf.png" rel="noreferrer"><img src="https://i.stack.imgur.com/hUUdf.png" alt="JavaScript validator preferences not allowing to change ECMAScript compliance level"></a></p>