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| URL | acid1.acidtests.org |
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| Type of site | Web standards test |
| Owner | The World Wide Web Consortium |
| Created by | Todd Fahrner |
| Launched | January 26, 1999 |
Acid1 is a test page for browsers. It was developed in October 1998 and was important in establishing baseline interoperability between early web browsers, especially for the Cascading Style Sheets 1.0 specification. Like the acid tests used during the California Gold Rush which produced a quick and obvious assessment of the quality of a piece of metal, the web Acid tests were designed to produce a clear indication of a browser's compliance to web standards.
Acid1 tests many features on one page and provides rasterized reference rendering. All major browsers pass the Acid1 test.[1] Acid1 was developed by Todd Fahrner, who was frustrated with the lack of stringent tests to improve browser interoperability. After looking at tests developed by Braden McDaniel that used reference renderings to clarify the intended result, Fahrner developed a comprehensive test that resulted in a quirky-looking graphic. In 1999, the test was incorporated into the CSS1 test suite.[2]. Acid1 is included as an offline Easter egg, accessible by typing 'about:tasman', in Internet Explorer 5 for Mac OS with the text replaced with the names of the developers.
Acid1 has served as inspiration for Acid2 and Acid3.
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