Development and history of Chrome google

Development

Chrome was assembled from 25 different code libraries from Google and third parties such as Mozilla's Netscape Portable Runtime, Network Security Services, NPAPI, as well as SQLite and a number of other open-source projects ^[32] The JavaScript virtual machine was considered a sufficiently important project to be split off (as was Adobe/Mozilla's Tamarin) and handled by a separate team in Denmark coordinated by Lars Bak at Aarhus. According to Google, existing implementations were designed "for small programs, where the performance and interactivity of the system weren't that important," but web applications such as Gmail "are using the web browser to the fullest when it comes to DOM manipulations and Javascript", and therefore would significantly benefit from a JavaScript engine that could work faster.
Chrome uses the WebKit rendering engine to display web pages, on advice from the Android team.^[12] Like most browsers, Chrome was extensively tested internally before release with unit testing, "automated user interface testing of scripted user actions" and fuzz testing, as well as WebKit's layout tests (99% of which Chrome is claimed to have passed). New browser builds are automatically tested against tens of thousands of commonly accessed websites inside of the Google index within 20–30 minutes.^[12]
Chrome includes Gears, which adds features for web developers typically relating to the building of web applications (including offline support).^[12]

The results of the Acid3 test on Google Chrome 4.0

The first release of Google Chrome passed the Acid1 and Acid2 tests, but not Acid3. On Acid3 it scored 79 out of the 100 subtests, higher than contemporary versions of Internet Explorer 7 (14/100), Firefox 3 (71/100), and Safari 3 (75/100); but lower than Opera 9 (83/100). When compared with contemporary development builds of Firefox, Internet Explorer, Opera, and Safari, Chrome scored lower than Firefox 3.1 Beta 1 (85/100), Opera (100/100), and Safari 4 (100/100); but still higher than Internet Explorer (21/100).^[33] However, version 2.0 of Google Chrome passed all 100 subtests (but still failed the link test).^{[citation needed]} Google Chrome 3.0 scored 100/100 but showed a 'X' in the upper right corner because downloadable fonts were disabled until security concerns surrounding them could be resolved. Releases of Google Chrome starting with version 4.0 and higher pass all aspects of the Acid 3 test, including the link test and downloadable fonts.
On 7 July 2009, Google announced plans for a Google Chrome OS based on the Chrome browser and Linux.
Google released Chrome 2.0 on 21 May 2009, citing increased speed and stability. New features included form autofill, an improved New Tab Page, and full screen mode.
Version 3.0 was released on 15 September 2009, bringing with it a 25% speed improvement, HTML5 capabilities (such as and elements with native support for Ogg Theora video, Ogg Vorbis audio, H.264 video, AAC and MP3 audio), an improved Omnibox, theme support, and a redesigned New Tab Page.
Version 4.0 was released for Windows on 25 January 2010, adding extension support, bookmark sync, improved developer tools, better HTML5 support, performance improvements, and increased security.

this article is picked from the source wikipedia.