Slightly related is Opera transitioning from version 9.x to 10.x: <a href="http:&#x2F;&#x2F;www.sitepoint.com&#x2F;opera-10-user-agent&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.sitepoint.com&#x2F;opera-10-user-agent&#x2F;</a> (couldn&#x27;t find the original dev blog)