A series of tests from the Web Standards Project to assess the standards support of web browsers.

Acid3 Test

Acid3 is a test page from the Web Standards Project that checks how well a web browser follows certain web standards, especially relating to the DOM and JavaScript. (more)

Chrome 2	Chrome 1	Firefox 3	Firefox 2	Opera 9
Safari 4	Safari 3	Internet Explorer 8	Internet Explorer 7	Internet Explorer 6

Acid2 Test

Acid2 is a test suite published and promoted by the Web Standards Project to identify web page rendering flaws in web browsers and other applications that render HTML.

Acid2 was released on April 12, 2005. It was developed in the spirit of Acid1, a relatively narrow test of Cascading Style Sheets (CSS) compliance. As with all of the web acid tests, the way a web browser displays the test is compared to a reference rendering. If the two match, the browser is considered to pass the test. (more)

Chrome 2	Chrome 1	Firefox 3	Firefox 2	Opera 9
Safari 4	Safari 3	Internet Explorer 8	Internet Explorer 7	Internet Explorer 6

Acid1 Test

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 CSS1 specification.

Acid1 was different from other test suites when it was first released; Acid1 tested many features on one page and provided a rasterized reference rendering. Currently all major browsers pass the Acid1 test. (more)

Chrome 2	Chrome 1	Firefox 3	Firefox 2	Opera 9
Safari 4	Safari 3	Internet Explorer 8	Internet Explorer 7	Internet Explorer 6