Google Chrome
Google Chrome Icon | |||||||||||
Google Chrome Screenshot | |||||||||||
Developer(s) | Google Inc. | ||||||||||
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Initial release | September 2, 2008 | ||||||||||
Stable release |
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Preview release |
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Written in | C++, Assembly | ||||||||||
Engine | WebKit (Based on KHTML) | ||||||||||
Operating system | Microsoft Windows (Windows XP SP2 and later); Mac OS X and Linux in development. | ||||||||||
Size | 10.5 MB | ||||||||||
Available in | 50 languages | ||||||||||
Type | Web browser | ||||||||||
License | Google Chrome Terms of Service (Google Chrome executable), BSD (source code and Chromium executable) | ||||||||||
Website | www.google.com/chrome code.google.com/chromium/ dev.chromium.org/ |
Google Chrome is a web browser released by Google which uses the WebKit layout engine and application framework. It was first released as a beta version for Microsoft Windows on 2 September 2008, and the public stable release was on 11 December 2008. The name is derived from the graphical user interface frame, or "chrome", of web browsers. As of 1 November 2009[update], Chrome was the fourth most widely used browser, with 3.6% of worldwide usage share of web browsers.[9] Development versions of Chrome for Linux and Mac OS X were released in June 2009.
Google released the entire source code of Chrome, including its bespoke V8 JavaScript engine as an open source project entitled Chromium, in 2008.[10][11] This move enabled third-party developers to study the underlying source code and potentially port the browser to the Linux and Mac OS X platforms. A Google spokesperson also expressed hope that other browsers would adopt V8 to help web applications.[12] The Google-authored portion of Chromium is released under the permissive BSD license,[13] which allows portions to be incorporated into both open source and proprietary software programs.[14] Other portions of the source code are subject to a variety of open-source licenses.[15] Chromium implements the same feature set as Chrome, but without Google branding and automatic updates.
History
Announcement
The release announcement was originally scheduled for 3 September 2008, and a comic by Scott McCloud was to be sent to journalists and bloggers explaining the features of and motivations for the new browser.[16] Copies intended for Europe were shipped early and German blogger Philipp Lenssen of Google Blogoscoped[17] made a scanned copy of the 38-page comic available on his website after receiving it on 1 September 2008.[18] Google subsequently made the comic available on Google Books and their site[19] and mentioned it on its official blog along with an explanation for the early release.[20]
Public release and early post-release history
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/67/File-Chromium-Linux-Alpha.png/200px-File-Chromium-Linux-Alpha.png)
The browser was first publicly released for Microsoft Windows (XP and later only) on 2 September 2008 in 43 languages, officially a beta version.[21] Chrome quickly gained about 1% market share despite Mac OS X and Linux versions still being under development.[22][23][24][25] After the initial surge, usage share dropped until it hit a low of 0.69% in October 2008. It then started rising again until by December 2008, Chrome again passed the 1% threshold.[26]
In late 2008, a message saying that a "test shell" is available to build on Linux was placed in the Chromium project's developer wiki.[27] Some tried this shell, which apparently lacked many features, but appeared to function quite well in rendering web sites (including JavaScript).[28][29] In early January 2009, CNET reported that Google planned to release versions for Mac OS X and Linux in the first half of the year.[30] By March 2009, it was possible to build a pre-alpha version of the Chromium browser, which looked similar to the Windows release, but was still very far from complete.[31] The first official Chrome Mac OS X and Linux developer previews[32] were announced on 4 June 2009 with a blog post[33] saying they were missing many features and were intended for early feedback rather than general use. On 9 October 2009, Google CEO Eric Schmidt stated that Chrome for Mac would be released "in a couple of months."[34]
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. Ten days after the Chrome launch a new JavaScript engine, SquirrelFish Extreme, was announced by the WebKit team, making the performance difference between WebKit and Chromium a dead heat again.[35]
On 2 September 2008, a CNET news item[36] drew attention to a passage in the terms of service for the initial beta release, which seemed to grant to Google a license to all content transferred via the Chrome browser. The passage in question was inherited from the general Google terms of service.[37] On the same day, Google responded to this criticism by stating that the language used was borrowed from other products, and removed the passage in question from the Terms of Service.[38] Google noted that this change would "apply retroactively to all users who have downloaded Google Chrome."[39] There was subsequent concern and confusion about whether and what information the program communicates back to Google. The company stated that usage metrics are only sent when users opt in by checking the option "help make Google Chrome better by automatically sending usage statistics and crash reports to Google" when the browser is installed.[40]
The first release of Google Chrome passed the Acid1 test but on Acid2 a very small artifact appeared.[41] It also passed 79 out of the 100 subtests on Acid3, 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).[42] 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),[42] but still higher than Internet Explorer (21/100).[43] However, version 2.0 scored 100 out of 100 subtests while still failing the link test.[citation needed] The current stable version (3.0) scores 100 out of 100 but shows a 'X' in the upper right corner because downloadable fonts are disabled until security concerns surrounding them can be resolved.[44]
On 7 July 2009, Google announced plans for a Google Chrome OS based on the Chrome browser and Linux.[45]
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.[46]
Version 3.0 was released on 15 September 2009, bringing with it a 25% speed improvement, HTML5 capabilities (such as <video>
and <audio>
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.[47][48][49][50][51]
Features
Google Chrome aims to improve security, speed, and stability. There are extensive differences from its peers in Chrome's minimalistic user interface,[19] which is atypical of modern web browsers.[52] Chrome's strength is its application performance and JavaScript processing speed, both of which were independently verified by multiple websites to be the swiftest amongst the major browsers of its time.[53][54][55] However, with the advent of WebKit's Squirrelfish Extreme and Mozilla's TraceMonkey JavaScript engines, Chrome's JavaScript execution performance has been found to be slower.[56][57][58][59] Many of Chrome's unique features had been previously announced by other browser developers, but Google was the first to implement and publicly release them.[60] For example, its most prominent graphical user interface (GUI) innovation, the merging of the address bar and search bar (the Omnibox) was first announced by Mozilla in May 2008 as a planned feature for Firefox.[61] Chrome was assembled from 26 different code libraries from Google and others from third parties such as Netscape.[62]
Security
Chrome periodically downloads updates of two blacklists (one for phishing and one for malware), and warns users when they attempt to visit a harmful site. This service is also made available for use by others via a free public API called "Google Safe Browsing API". Google notifies the owners of listed sites who may not be aware of the presence of the harmful software.[19]
Chrome will typically allocate each tab to fit into its own process to "prevent malware from installing itself" or "using what happens in one tab to affect what happens in another", however the actual process allocation model is more complex.[63] Following the principle of least privilege, each process is stripped of its rights and can compute, but can not write files or read from sensitive areas (e.g. documents, desktop)—this is similar to the "Protected Mode" that is used by Internet Explorer 7 on Windows Vista. The Sandbox Team is said to have "taken this existing process boundary and made it into a jail";[64] for example, malicious software running in one tab is supposed to be unable to sniff credit card numbers entered in another tab, interact with mouse inputs, or tell Windows to "run an executable on start-up" and it will be terminated when the tab is closed.[19] This enforces a simple computer security model whereby there are two levels of multilevel security (user and sandbox) and the sandbox can only respond to communication requests initiated by the user.[65]
Typically, plugins such as Adobe Flash Player are not standardized and as such, cannot be sandboxed as tabs can be. These often need to run at, or above, the security level of the browser itself. To reduce exposure to attack, plugins are run in separate processes that communicate with the renderer, itself operating at "very low privileges" in dedicated per-tab processes. Plugins will need to be modified to operate within this software architecture while following the principle of least privilege.[19] Chrome supports the Netscape Plugin Application Programming Interface (NPAPI),[66][67] but does not support the embedding of ActiveX controls.[67] Also, Chrome does not have an extension system such as Mozilla's XPInstall architecture.[68] Java applets support is available in Chrome as part of Java 6 update 10.[69][70]
A private browsing feature called Incognito mode is provided that prevents the browser from storing any history information or cookies from the websites visited. Incognito mode is similar to the private browsing feature available in Apple's Safari, Mozilla Firefox 3.5, and Internet Explorer 8.[71]
A denial-of-service vulnerability was found that allowed a malicious web page to crash the whole web browser.[72][73] Google Chrome developers confirmed the flaw, and it was fixed in the 0.2.149.29 release.[74] Other security issues have been discovered in Chrome, including a vulnerability in versions prior to 2.0.172.33 that would allow a malicious or compromised web site to crash the browser and execute hostile code on a victim's system.[75]
Speed
The JavaScript virtual machine used by Chrome, the V8 JavaScript engine, has features such as dynamic code generation, hidden class transitions and precise garbage collection.[19] Tests by Google in September 2008 showed that V8 was about twice as fast as Firefox 3.0 and the WebKit nightlies.
Several websites performed benchmark tests using the SunSpider JavaScript Benchmark[76] tool as well as Google's own set of computationally intense benchmarks, which includes ray tracing and constraint solving.[77] They unanimously reported that Chrome performed much faster than all competitors against which it had been tested, including Safari, Firefox 3.0, Internet Explorer 7, and Internet Explorer 8.[78][79][80][81] Opera has not been compared to Chrome in those comparisons, and neither have other minority browsers.[82][83] Another blog post by Mozilla developer Brendan Eich compared Chrome's V8 engine to his own TraceMonkey Javascript engine which was introduced in Firefox 3.1alpha, stating that some tests were faster in one engine and some were faster in the other, with Firefox 3.1a faster overall.[84] John Resig, Mozilla's JavaScript evangelist, further commented on the performance of different browsers on Google's own suite, finding Chrome "decimating" other browsers, but he questions whether Google's suite is representative of real programs. He stated that Firefox 3.0 performed poorly on recursion intensive benchmarks, such as those of Google, because the Mozilla team had not implemented recursion-tracing yet.[85]
Chrome also uses DNS prefetching to speed up website lookups.[86] This feature is available in Internet Explorer and Firefox as an extension, and is built-in and enabled by default in Firefox 3.5.
On Windows platforms, Chrome uses a 1000Hz timer which results in high power consumption and high CPU overhead in virtual machines. This can easily be observed by starting Chrome in a virtual machine such as VirtualBox and monitoring the CPU utilization on the host system.[citation needed]
Stability
The Gears team implemented a multi-process architecture in Chrome,[87] similar to Loosely Coupled Internet Explorer (LCIE) recently implemented by Internet Explorer 8.[88] By default, a separate process is allocated to each site instance and plugin, a process referred to as process isolation.[89] This prevents tasks from interfering with each other, which is good[neutrality is disputed] for security and stability; an attacker successfully gaining access to one application does not gain access to all[citation needed], and failure in one application results in a Sad Tab screen of death, similar to the well-known Sad Mac, except only one single tab crashes instead of the whole application. This strategy exacts a fixed per-process cost up front, but results in less memory bloat overall as fragmentation is confined to each process and no longer results in further memory allocations.[90]
Chrome features a process management utility called the Task Manager which allows the user to "see what sites are using the most memory, downloading the most bytes and abusing [their] CPU" (as well as the plugins which run in separate processes) and terminate them.[19] Some users have reported a conflict with Internet Explorer, often resulting in the blue screen error on Windows.[91]
User interface
By default, the main user interface includes back, forward, refresh, home, bookmark, go, and cancel buttons. The home button can be configured through options to take the user to the New Tab Page or a custom home page.
Tabs are the primary component of Chrome's user interface and as such, have been moved to the top of the window rather than below the controls. This subtle change contrasts with many existing tabbed browsers which are based on windows and contain tabs. Tabs (including their state) can be transferred seamlessly between window containers by dragging. Each tab has its own set of controls, including the Omnibox.[19]
The Omnibox is the URL box at the top of each tab, which combines the functionality of both the Address bar and search box. If you enter the URL of a site you have previously searched from, Chrome will let you press Tab to search the site again directly from the Omnibox. When you start typing in the Omnibox, Chrome provides suggestions for previously visited sites (based on the URL or in-page text), popular websites (not necessarily visited before - powered by Google Suggest), and popular searches. Chrome will also autocomplete the URLs of sites you visit often.[19] If you type several keywords into the Omnibox and press enter, Chrome will conduct the search using your default search engine.
When Google Chrome is not maximized, the tab bar appears directly under the title bar. When maximized, the tabs become flush with the top of the titlebar. Like other browsers, it has a full-screen mode that hides the operating system's interface as well as the browser chrome.
Google Chrome includes Gears, which adds features for web developers typically relating to the building of web applications (including offline support).[19]
One of the differentiating features of Chrome when it was released was the New Tab Page, which can replace the browser home page and is displayed when a new tab is created. This showed[92] thumbnails of the nine most visited web sites along with the sites most often searched, recent bookmarks, and recently closed tabs, same as Internet Explorer and Firefox with the Google Toolbar 5 installed.[19] In Google Chrome 2.0, the New Tab Page was updated to allow users to hide thumbnails they didn't want to appear.[46]
Starting in version 3.0, the New Tab Page was revamped to display thumbnails of the 8 most visited web sites. The thumbnails could be rearranged, pinned, and removed. Alternatively, a list of text links could be displayed instead of thumbnails. It also features a "Recently closed" bar that shows recently closed tabs and a "tips" section that displays hints and tricks for using the browser.[93]
Chrome includes a bookmark manager that can be accessed from a menu. Adding the command-line option: --bookmark-menu adds a bookmarks button to the right of the Omnibox that can be used in place of the bookmarks bar.[94]
Popup windows "are scoped to the tab they came from" and will not appear outside the tab unless the user explicitly drags them out.[19]
Chrome uses the WebKit rendering engine to display web pages, on advice from the Android team.[19] 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.[19]
Google Chrome's options window has three tabs: Basic, Personal Stuff, and Under the Hood. The Basic tab includes options for the home page, search engine, and default browser. The Personal Stuff tab lets you configure saved passwords, form autofill, browsing data, and themes. The Under the Hood tab allows you to change network, privacy, download, and security settings.
Chrome allows users to make local desktop shortcuts that open web applications in the browser. The browser, when opened in this way, contains none of the regular interface except for the title bar, so as not to "interrupt anything the user is trying to do." This allows web applications to run alongside local software (similar to Mozilla Prism and Fluid).[19]
Chrome does not have a status bar, but displays loading activity and hover-over information via a status bubble that pops up at the bottom left of the relevant page.
For web developers, Chrome features an element inspector similar to the one in Firebug.[86]
As part of Google's April Fools' Day jokes, a special build of Chrome was released on 1 April 2009 with the additional feature of being able to render pages in anaglyph 3D.[95]
Extensions
When Google launched Chrome in September, 2008, they stated that an application programming interface was planned.[96] On 1 December 2008, they announced that development of an extension system had begun.[97] Details were announced in May 2009, at Google I/O.[98]
As of October 2009, Google Chrome has support for several specially developed extensions, which can be installed and enabled separately. These extensions provide features such as gesture recognition,[99] additional development tools,[100] rudimentary Greasemonkey support,[101] and Stumble Upon navigation.[102]
Themes
Starting with Google Chrome 3.0, users can install themes to alter the appearance of the browser. Many free third-party themes[103] are provided in an online gallery, accessible through a "Get themes" button in Chrome's options[104], and by clicking an image link on the New Tab Page.[105]
Usage tracking
Chrome sends details about its usage to Google through both optional and non-optional user tracking mechanisms.[106]
Method[107] | Information sent | When | Optional? |
---|---|---|---|
RLZ identifier[108] | Encoded string, according to Google, contains non-identifying information such as when Chrome was installed. [109][110] |
|
No |
clientID[111] | Unique Identifier used for statistics service | Unknown | Yes |
Suggest[111] | Text typed into the address bar | While being typed | Yes |
Page not found | Text typed into the address bar | Upon receiving "Server not found" response | Yes |
Bug tracker | Details about crashes and failures | Unknown | Yes |
Some of the tracking mechanisms can be optionally enabled and disabled through the installation interface[citation needed] and through the browser's options dialog.[111] A freeware program called UnChrome has been made to erase the clientID on the hard drive.[112] Unofficial builds, such as SRWare Iron, seek to remove these features from the browser altogether.[107] The RLZ feature is not included in the Chromium browser either.[110]
Release Channels and Updates
On 8 January 2009 Google introduced a new release system with three distinct channels: Stable, Beta, and Developer preview (called the "Dev" channel). Before this change there were only two channels: Beta and Developer preview. All previous Developer channel users were moved to the Beta channel. The reason given by Google is that the Developer channel builds are less stable and polished than those that Developer channel users were getting during Google Chrome's Beta period. The stable channel will be updated with features and fixes once they have been thoroughly tested in the Beta channel, and the Beta channel will be updated roughly monthly with stable and complete features from the Developer channel. The Developer channel is where ideas get tested (and sometimes fail) and can be very unstable at times.[113][114]
Chrome automatically keeps itself up to date. The details differ by platform. On Windows, it uses Google Updater, and autoupdate can be controlled via Group Policy,[115] or you can download a standalone version that does not autoupdate.[116][117] On Mac, it uses Google Update Service, and autoupdate can be controlled via the Mac OS X 'defaults' system.[118] On Linux, it lets the system's normal package management system do the updates.
Reception
The Daily Telegraph's Matthew Moore summarizes the verdict of early reviewers: "Google Chrome is attractive, fast and has some impressive new features, but may not—yet—be a threat to its Microsoft rival."[119]
Microsoft reportedly "played down the threat from Chrome" and "predicted that most people will embrace Internet Explorer 8." Opera Software said that "Chrome will strengthen the Web as the biggest application platform in the world."[120] Mozilla said that Chrome's introduction into the web browser market comes as "no real surprise", that "Chrome is not aimed at competing with Firefox", and furthermore that it should not affect Google's revenue relationship with Mozilla.[121][122]
Chrome's design bridges the gap between desktop and so-called "cloud computing." At the touch of a button, Chrome lets you make a desktop, Start menu, or Quick Launch shortcut to any Web page or Web application, blurring the line between what's online and what's inside your PC. For example, I created a desktop shortcut for Google Maps. When you create a shortcut for a Web application, Chrome strips away all of the toolbars and tabs from the window, leaving you with something that feels much more like a desktop application than like a Web application or page.
On 9 September 2008, when Chrome was still in beta, the German Federal Office for Information Security (BSI) issued a statement about their first examination of Chrome, expressing a concern over the prominent download links on Google's German web page, because "beta versions should not be employed for general use applications" and browser manufacturers should provide appropriate instructions regarding the use of pre-released software. They did, however, praise the browser's technical contribution to improving security on the web.[124]
Concern about Chrome's optional usage collection and tracking have been noted in several publications.[125][126]
Reverse-engineering issues with Windows
On 11 September 2008, a few days after the release of Chrome's source code, Scott Hanselman noticed a comment in Chrome's code saying "You can find this information by disassembling Vista's SP1 kernel32.dll with your favorite disassembler."[127] Ars Technica published an article asking, "Did Google reverse-engineer Windows?" Google later denied disassembling Vista and referred to previous public discussion of the undocumented APIs that Google used.[128]
See also
- Comparison of web browsers
- Internet Explorer
- Mozilla Firefox
- Opera
- Safari
- Chromium
- SRWare Iron
- Google Chrome OS
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(help) - ^ Andy Zeigler (2008-03-11). "IE8 and Loosely-Coupled IE (LCIE)". Retrieved 2008-09-12.
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(help) - ^ Chromium Developer Documentation (2008-09-03). "Process Models". Retrieved 2008-09-12.
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(help) - ^ Google (2008-09-21). "Google Chrome book". Retrieved 2008-09-21.
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(help) - ^ Philipp Lenssen. "Google Chrome Screenshots". Google Blogoscoped. Retrieved 2008-09-02.
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