Abstract: Web pages are automatically checked for compliance with specified accessibility rules. When accessibility compliance testing is enabled, code to check for accessibility compliance is automatically injected and run to test one or more elements of the web page for accessibility compliance. Once the code is injected, the code is executed to determine the compliance with the specified accessibility rules. All/portion of the elements on the web page may be checked for accessibility compliance. The web page may be checked for accessibility compliance at one or more times. For example, the page may be checked for accessibility compliance upon loading and/or upon changes (e.g. AJAX event) which modifies the page markup. As long as the accessibility compliance testing is enabled, each page that is loaded by a service may be checked for accessibility compliance.