Acid2
This is the reference image for Acid2. In the real test, the nose becomes blue while the cursor is hovering over it.
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Type of site
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Web standards test |
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| Available in | English language |
| Owner | The Web Standards Project |
| Created by | Ian Hickson |
| Website | acid2.acidtests.org |
| Commercial | No |
| Registration | No |
| Launched | 13 April 2005 |
| Current status | Online |
Acid2 is a test page published and promoted by the Web Standards Project to expose web page 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, and was released on 13 April 2005. As with Acid1, an application passes the test if the way it displays the test page matches a reference image.
Acid2 tests aspects of HTML markup, CSS 2.1 styling, PNG images, and data URIs. 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.
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.
Acid2 was released on 13 April 2005. 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 until IE10 was released, which fails the test. Its successor, Microsoft Edge, is able to render correctly it as of Windows 10 version 1607. Acid2 was followed by Acid3.
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