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This is SunSpider, a JavaScript benchmark. This benchmark tests the core JavaScript language only, not the DOM or other browser APIs. It is designed to compare different versions of the same browser, and different browsers to each other. Unlike many widely available JavaScript benchmarks, this test is:

OM2 Core DOM2 Events DOM2 HTML DOM2 Range DOM2 Style (getComputedStyle, …) DOM2 Traversal (NodeIterator, TreeWalker) DOM2 Views (defaultView) ECMAScript HTML4 (, , …) HTTP (Content-Type, 404, …) Media Queries Selectors (:lang, :nth-child(), combinators, dynamic changes, …) XHTML 1.0 CSS2 (@font-face) CSS2.1 ('inline-block', 'pre-wrap', parsing…) CSS3 Color (rgba(), hsla(), …) CSS3 UI ('cursor') data: URIs SVG (SVG Animation, SVG Fonts, …) When taking the test, you should use the default settings of the browser you are testing. Changing the zoom level, minimum font size, applying a fit-to-width algorithm, or making other changes may alter the rendition of the test page without this constituting a failure in compliance. The Acid3 test measures some performance characteristics. The test does not attempt to make any comparisons or judgments as to the performance of any hardware used, and should not be used as a hardware benchmark. If the test is run on a slow computer or device, it may run slowly or not smoothly and this does not imply non-conformance.

Find out which browser offers the best performance on your system.