page_title: Acid3
section_title: Detailed results
hierarchical_section_title: Acid3 / Detailed results
caption_attribution_description: English: Acid3 test as viewed on Internet Explorer 8 Release Candidate 1. User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 1.1.4322)
context_page_description: The Acid3 test is a web test page from the Web Standards Project that checks a web browser's compliance with elements of various web standards, particularly the Document Object Model and JavaScript.
  If the test is successful, the results of the Acid3 test will display a gradually increasing fraction counter below a series of colored rectangles. The number of subtests passed will indicate the percentage that will be displayed on the screen. This percentage does not represent an actual percentage of conformance as the test does not really keep track of the subtests that were actually started. Moreover, the browser also has to render the page exactly as the reference page is rendered in the same browser. Like the text of the Acid2 test, the text of the Acid3 reference rendering is not a bitmap, in order to allow for certain differences in font rendering.
  Acid3 was in development from April 2007, and released on 3 March 2008. The main developer was Ian Hickson, a Google employee who also wrote the Acid2 test.
context_section_description: After the Acid3 test page is completely rendered, the word Acid3 can be clicked to see an alert (or shift-click for a new window) explaining exactly which subtests have failed and what the error message was. In case one of the 100 tests passed but took too much time, the report includes timing results for that single test. The alert reports the total time of the whole Acid3 test.
  In order to render the test correctly, user agents need to implement the CSS 3 Text Shadows and the CSS 2.x Downloadable Fonts specifications, which are currently under consideration by W3C to be standardized. This is required as the test uses a custom TrueType font, called "AcidAhemTest", to cover up a 20x20 red square. Supporting Truetype fonts however is not required by the CSS specification. A browser supporting only OpenType fonts with CFF outlines or Embedded OpenType fonts could support the CSS standard, but fail the test in the Acid3 test. The glyph, when rendered by the downloaded font, is just a square, made white with CSS, and thus invisible.
  In addition, the test also uses Base64 encoded images, some more advanced selectors, CSS 3 color values (HSLA) as well as bogus selectors and values that should be ignored.
caption: Acid3 rendered by Internet Explorer 8.0 (before the September 2011 update of the Acid3 test). 20/100, test failed.
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