<p>Which version of JavaScript does Google Chrome support in relation to Mozilla Firefox?  In other words, does Chrome support JavaScript 1.6, 1.7, or 1.8 which Firefox also supports or some combination of them?</p>

Google Chrome supports up to Javascript 1.7:
```
```
<script language="javascript1.7">alert(1.7);</script> - Alerts
<script language="javascript1.8">alert(1.8);</script> - Doesn't alert
```
```