Version 7.0 saw Opera undergo an extensive rewrite with the faster and more powerful Presto layout engine. On January 28, 2003, Opera 7 was released, introducing the new " Presto" layout engine, with improved CSS, client-side scripting, and Document Object Model (DOM) support. On June 28, 2000, Opera 4 for Windows (Elektra) was released, introducing a new cross-platform core, and a new integrated email client.
Further releases would require Windows 95. The 16-bit version of Opera for Windows 3.62 is the last version to support Windows 3.x. Version 3.6 was released on May 12, 1999. Up to 6.0 Opera supported most common web standards, Netscape plugins and some other recent standards such as WAP and WML for wireless devices, but its implementation of advanced ECMAScript (of which "JavaScript" is an implementation) and the HTML Document Object Model was poor. Since version 3.5, Opera has supported CSS, and Håkon Wium Lie, one of the inventors of CSS, is the CTO at Opera. In 1998, Opera 3.5 was released, adding Cascading Style Sheets (CSS) support and file upload capability. It was released for multiple operating systems on December 31, 1997. Opera 3 was the first version of Opera with JavaScript support, but Java was still missing. Opera 15 saw the browser being fully rewritten, with this and subsequent releases being based on Blink and Chromium. In February 2013, Opera Software announced that their in-house rendering engine, Presto, would be phased out in favour of WebKit. Until version 2.0, the Opera browser was called MultiTorg Opera (version 1.0) and had only a limited internal release-although it was demonstrated publicly at the Third International Opera has undergone extensive changes and improvements, and introduced notable features such as Speed Dial. In 1995, the project branched out into a separate company named Opera Software ASA, with the first publicly available version released in 1996. The history of the Opera web browser began in 1994 when it was started as a research project at Telenor, the largest Norwegian telecommunications company.
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