Javascript IN operator compatibility

Question

Can someone tell me since which ECMA version the IN operator is available and which browsers (versions) support it ?

Explanation:

The IN-operator can be used

Answer 1

According to MDC, it's implemented in JavaScript 1.4.

According to Wikipedia:

• Netscape Navigator 6.0
• Firefox 1.0+
• IE 5.5+
• Opera 6.0+
• Safari 3.0+
• Chrome 1.0+

So I think you're probably OK :)