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 This is the reference image for Acid2. In the real test, the nose becomes blue while the cursor is hovering over the yellow part of the face. | |
Type of site | Web standards test |
|---|---|
| Available in | English |
| Owner | The Web Standards Project |
| Created by | Ian Hickson |
| URL | https://webstandards.org/files/acid2/test.html |
| Commercial | No |
| Registration | No |
| Launched | 13 April 2005 |
| Current status | Online |
Acid2 is a webpage that test web browsers' functionality in displaying aspects of HTML markup, CSS 2.1 styling, PNG images, and data URIs. The test page was released on 13 April 2005 by the Web Standards Project. The Acid2 test page will be displayed correctly in any application that follows the World Wide Web Consortium and Internet Engineering Task Force specifications for these technologies. These specifications are known as web standards because they describe how technologies used on the web are expected to function.
The Acid2 tests rendering flaws in web browsers and other applications that render HTML. Named after the acid test for gold, it was developed in the spirit of Acid1, a relatively narrow test of compliance with the Cascading Style Sheets 1.0 (CSS1) standard. As with Acid1, an application passes the test if the way it displays the test page matches a reference image.
Acid2 was designed with Microsoft Internet Explorer particularly in mind. The creators of Acid2 were dismayed that Internet Explorer did not follow web standards. It was prone to display web pages differently from other browsers, causing web developers to spend time tweaking their web pages. Acid2 challenged Microsoft to make Internet Explorer comply with web standards. On 31 October 2005, Safari 2.0.2 became the first browser to pass Acid2. Opera, Konqueror, Firefox, and others followed. With the release of Internet Explorer 8 on 19 March 2009, the latest versions of all major desktop web browsers now pass the test. Acid2 was followed by Acid3.