![]() ![]() This technique, prerendering or pre-loading, may inflate the statistics for the browsers using it because of pre-loading of resources which are not used in the end. Firefox, Chrome, Safari, and Opera will, under some circumstances, fetch resources before they need to render them, so that the resources can be used faster if they are needed.Sophisticated users who are aware of this may then "spoof" the user agent string in order to gain access to the site. Many of the untested browsers may still be otherwise capable of rendering the content. One common reason for this is that the website has been tested to work with only a limited number of browsers, and so the site owners enforce that only tested browsers are allowed to view the content, while all other browsers are sent a "failure" message, and instruction to use another browser. Occasionally websites are written in such a way that they effectively block certain browsers.A user who revisits a site shortly after changing or upgrading browsers may be double-counted under some methods overall numbers at the time of a new version's release may be skewed. ![]() The Register reported in June 2008 that traffic from AVG Linkscanner, using an IE6 user agent string, outstripped human link clicks by nearly 10 to 1. This is done to trick attack sites that might display clean content to the scanner, but not to the browser.
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