Top centre of screen the username and password form has a Login button with a weird rendering of a button labelled "Go" underneath. This is the main account login page for one of Australia's main ISP's (owned by Telstra) - a fairly important page to get the rendering correct on.
*** Bug 19238 has been marked as a duplicate of this bug. ***
Looks like evangelism bug. A page viewed in WebKit r39474 has contains: <input tabindex="5" type="button" id="Submit" name="Submit" class="submit" value="Go" title="Go" onclick="javascript:submitToAccessManager(this,false)" /> The same page opened in Firefox 3.1 beta 2 contains different code: <input tabindex="5" type="button" id="Submit" name="Submit" class="submit" title="Go" onclick="javascript:submitToAccessManager(this,false)" /> Notice lack of 'value="Go"'. However User Agent switching doesn't fix the problem in WebKit.