Differences
For all four of the sites tested, there was little variation between the three browsers I used, Internet Explorer, Firefox and Chrome. Variances in the screen shots are likely due to the browser viewport resolution used. The testing with Internet Explorer was done locally on my desktop computer, and for Firefox and Chrome I used a free third-party site, browserling.com, which offers a plethora of browsers to use, and you can even select your operating system.
Despite the difference in resolution, the sites maintained their usability and aesthetics across each platform.