title: Why does navigator.productSub always equals '20030107' on Chrome and Safari?
body: <p>According to the <a href="https://developer.mozilla.org/en-US/docs/DOM/window.navigator.productSub" rel="nofollow">MDN</a> the archaic <code>navigator.productSub</code> property returns the 'build number of the browser'. This probably worked in the nineties, but it's pretty useless now.</p>
  
  <p>However, i'm interested in the numbers that some of the browsers return. Both Chrome and Safari always return the value <code>20030107</code>, Firefox seems to return <code>20100101</code>. What's the deal with these two numbers? Does <code>20030107</code> stand for July 1st, 2003? And what happened then that was so interesting?</p>
  
  <p>Here's hoping someone can dig up a little web history.</p>