Google Chrome is a freeware browsere developed by Google. It used the WebKit layout engine until version 27 and, with the exception of its iOS releases, from version 28 and beyond uses the WebKit fork Blink. It was first released as a beta version for Microsoft Windows on September 2, 2008, and as a stable public release on December 11, 2008.
As of January 2015, StatCounter estimates that Google Chrome has a 51% worldwide usage share of Web Browsers as a desktop browser. It is also the most popular browser for smartphones. Its success has led to Google expanding the 'Chrome' brand name on various other products such as the Chrome Cast
Google releases the majority of Chrome's source code as an Open source Project project Chromium. A notable component that is not open source is the built-in Adobe Flash Player.
History
Google CEO Eric Schmidt opposed the development of an independent web browser for six years. He stated that "at the time, Google was a small company," and he did not want to go through "bruising Browser Wars" After co-founders Sergrey Bin and Larry Page hired several Mozilla Firefox developers and built a demonstration of Chrome, Schmidt admitted that "It was so good that it essentially forced me to change my mind.
Announcement
The release announcement was originally scheduled for September 3, 2008, and a comic by Scott Mccloud was to be sent to journalists and bloggers explaining the features within the new browser.Copies intended for Europe were shipped early and German blogger Phillip Lesson made a scanned copy of the 38-page comic available on his website after receiving it on September 1, 2008. Google subsequently made the comic available on Google Books and mentioned it on their official blog along with an explanation for the early release.
Public release
The browser was first publicly released for Microsoft Windows (XP and later versions) on September 2, 2008 in 43 languages, officially a beta version.
On the same day, a CNEt news item drew attention to a passage in the Terms of Service statement for the initial beta release, which seemed to grant to Google a license to all content transferred via the Chrome browser. This passage was inherited from the general Google terms of service. Google responded to this criticism immediately by stating that the language used was borrowed from other products, and removed this passage from the Terms of Service.
Chrome quickly gained about 1% usage share. After the initial surge, usage share dropped until it hit a low of 0.69% in October 2008. It then started rising again and by December 2008, Chrome again passed the 1% threshold.
In early January 2009, CNET reported that Google planned to release versions of Chrome for OS X and LInux in the first half of the year. The first official Chrome OS X and Linux developer previews were announced on June 4, 2009 with a blog post saying they were missing many features and were intended for early feedback rather than general use.
In December 2009, Google released beta versions of Chrome for OS X and Linux. Google Chrome 5.0, announced on May 25, 2010, was the first stable release to support all three platforms.
Development
Chrome was assembled from 25 different code libraries from Google and third parties such as Mozilla Netscape Portable Runtime, Network Security Services,NPAPI, sika Graphic engine, SQ lite, and a number of other open-source projects. The V8 java Script Virtual Machine was considered a sufficiently important project to be split off 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 Application such as Gmail "are using the web browser to the fullest when it comes to DOM manipulations and Jave Script", and therefore would significantly benefit from a JavaScript engine that could work faster.
Chrome uses the Blink rendering engine to display web pages. Based on WebKit, Blink only uses WebKit's "WebCore" components while substituting all other components, such as its own multi-process architecture in place of WebKit's native implementation.
Chrome is internally tested with Unit Testing, "automated user interface testing of scripted user actions", Fuzz Testing, as well as WebKit's layout tests (99% of which Chrome is claimed to have passed), and against commonly accessed websites inside the Google index within 20–30 minutes.
Google created Gears for Chrome, which added features for Web Develepores typically relating to the building of web applications, including offline support.Google phased out Gears as the same functionality became available in the HTML 5 standards.
On January 11, 2011, the Chrome product manager, Mike Jazayeri, announced that Chrome would remove H 264 veadio codec support for its HTML5 player, citing the desire to bring Google Chrome more in line with the currently available open codecs available in the Chromium project, which Chrome is based on. Despite this, on November 6, 2012, Google released a version of Chrome on Windows which added Hardware accerlated H.264 video decoding. In October 2013, Ciscoannounced that it was open-sourcing its H.264 codecs and will cover all fees required.
On February 7, 2012, Google launched Google Chrome Beta for Android 4.1 devices. On many new devices with Android 4.1 and later preinstalled, Chrome is the default browser.
On April 3, 2013, Google announced that it would fork the WebCore component of WebKit to form its own layout engine known as Blink. The aim of Blink will be to give Chrome's developers more freedom in implementing its own changes to the engine, and to allow its codebase to be trimmed of code that is unnecessary or unimplemented by Chrome.
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