Vector Markup Language MHT). Such files retain complete vector information, and can be reopened for editing using other Microsoft applications, such as Microsoft PowerPoint. VML was natively supported by Microsoft's Internet Explorer up to version 9 inline within HTML, using an undefined version of SGML namespaces. Support for VML was dropped in Internet Explorer 10 and subsequent versions. Support for "ink annotations" in Office Open XML files was added to LibreOffice during the 3.7 development cycle. VML is not natively supported by most web browsers. Web browsers such as Mozilla Firefox, Opera, Safari or Google Chrome support SVG instead of VML. Though VML
Embrace, extend, and extinguish extensions. For example, in 1995, Netscape implemented the "font" tag, among other HTML extensions, without seeking review from a standards body. With the rise of Internet Explorer, the two companies became locked in a dead heat to out-implement each other with non-standards-compliant features. In 2004, to prevent a repeat of the "browser wars", and the resulting morass of conflicting standards, the browser vendors Apple Inc. (Safari), Mozilla Foundation (Firefox), Google Inc. (Google Chrome) and Opera Software (Opera browser) formed the Web Hypertext Application Technology Working Group (WHATWG) to create open standards to complement those of the World Wide Web Consortium.