Test, TEST or Tester may refer to: Test (assessment), an assessment intended to measure the respondents' knowledge or other abilities. Physical fitness test. The HTML5 test does not try to test all of the new features offered by HTML5, nor does it try to test the functionality of each feature it does detect. Despite these. This will test your browser and connection for IPv6 readiness, as well as show you your current IPV4 and IPv6 address.