Tasman is the name of a layout engine developed by Microsoft, introduced with the Macintosh version of Internet Explorer 5, a new feature in the development of Internet Explorer for Mac (IE mac versions extended back to IE 2). Tasman was an attempt to improve support for web standards, as defined by the World Wide Web Consortium. At the time of its release, Tasman was seen as the layout engine with the best support for web standards such as HTML and CSS. Internet Explorer for Mac is no longer supported, but newer versions of Tasman are incorporated in some other current Microsoft products.
The first version of Tasman (referred to as "v0") was released with Internet Explorer 5 Macintosh Edition on March 27 2000. An upgraded version (version 0.1) followed on with the release of Internet Explorer 5.1 for Mac.
On May 15 2003 Microsoft released the subscription-only MSN for Mac OS X browser, which used an upgraded version of Tasman (version 0.9) as its layout engine. In a posting to the Mac Internet Explorer Talk list, Internet Explorer for Mac Program Manager Jimmy Grewal listed a number of improvements:
For a while Tasman was improved as part of a number of TV set-top box projects at Microsoft reaching version 1.0. As a matter of fact the Tasman engine is now used in the Microsoft TV Mediaroom Edition.
Typing "about:tasman" in Internet Explorer for the Mac will bring up a list of people who worked on the browser incorporated into the Acid1 test layout.