Browser compatibility testing or ensuring the working of a site on different browsers is an important part of website testing. Same site may not look similar when viewed on different browsers. For example: The same page may vary depending on different display resolution. Therefore all the functionalities, design of the site must be tested on common browsers rather than fixing and testing on a single browser. Sometimes, changes made on a site does not reflect at once unless we clear browser cache. In that case testers need to clear cache prior to testing.