 Microsoft's Internet Explorer was the dominant browser after that, but modern web browsers such as Mozilla Firefox, Opera and Safari have become dominant, and support additional web standards beyond what Internet Explorer supports.Because of Internet Explorer's backwards compatibility, some web pages have continued to use non-standard HTML tags, DOM handling scripts, and platform-specific technologies such as ActiveX, which could potentially be harmful for Web accessibility and device independence.There have been various projects to improve web interoperability, for example the Web Standards Project, Mozilla's Technology Evangelism and Web Standards Group, and the Web Essential Conference.