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Chrome uses the [[WebKit]] rendering engine to display web pages, on advice from the [[Android (operating system)|Android]] team.<ref name="chrome-comic"/> However, Chrome only uses the base "WebCore" components while substituting its own components (such as its own multi-process architecture, unlike the one implemented natively by WebKit2).<ref name=ars-blink/> Chrome is tested internally 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.<ref name="chrome-comic"/>
Chrome uses the [[Blink (layout engine)|Blink]] rendering engine to display web pages. Blink only uses the base "WebCore" components while substituting its own components (such as its own multi-process architecture, unlike the one implemented natively by WebKit2 (Which Blink is based on).<ref name=ars-blink/> Chrome is tested internally 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.<ref name="chrome-comic"/>


Google created [[Gears (software)|Gears]] for Chrome, which added features for [[web developer]]s typically relating to the building of web applications, including offline support.<ref name="chrome-comic"/> However, Google phased out Gears in favor of [[HTML5]].<ref>{{cite web |url= http://gearsblog.blogspot.com/2010/02/hello-html5.html |title= Hello HTML5 |publisher=Google |author=Ian Fette |date= February 19, 2010 |accessdate=2012-07-11}}</ref>
Google created [[Gears (software)|Gears]] for Chrome, which added features for [[web developer]]s typically relating to the building of web applications, including offline support.<ref name="chrome-comic"/> However, Google phased out Gears in favor of [[HTML5]].<ref>{{cite web |url= http://gearsblog.blogspot.com/2010/02/hello-html5.html |title= Hello HTML5 |publisher=Google |author=Ian Fette |date= February 19, 2010 |accessdate=2012-07-11}}</ref>

Revision as of 13:29, 31 May 2013

This article is about the web browser. For the operating system, see Google Chrome OS.

Google Chrome
Developer(s)Google Inc.
Initial releaseSeptember 2, 2008 (2008-09-02)
Stable release
Windows, macOS, Linux128.0.6613.119/120[1] Edit this on Wikidata / 2 September 2024; 4 days ago (2 September 2024)
Windows Server 2012/2012 R2109.0.5414.165[2] / 13 September 2023; 11 months ago (2023-09-13)
Android128.0.6613.127[3] Edit this on Wikidata / 4 September 2024; 2 days ago (4 September 2024)
iOS128.0.6613.98[4] Edit this on Wikidata / 27 August 2024; 10 days ago (27 August 2024)
Extended Support Release128.0.6613.120[1] Edit this on Wikidata / 2 September 2024; 4 days ago (2 September 2024)

Mobile versions:
Template:Latest stable software release/Google Chrome for Android
Windows, macOS, Linux128.0.6613.119/120[1] Edit this on Wikidata / 2 September 2024; 4 days ago (2 September 2024)
Windows Server 2012/2012 R2109.0.5414.165[5] / 13 September 2023; 11 months ago (2023-09-13)
Android128.0.6613.127[3] Edit this on Wikidata / 4 September 2024; 2 days ago (4 September 2024)
iOS128.0.6613.98[4] Edit this on Wikidata / 27 August 2024; 10 days ago (27 August 2024)
Extended Support Release128.0.6613.120[1] Edit this on Wikidata / 2 September 2024; 4 days ago (2 September 2024)

Preview release
Windows, macOS, Linux129.0.6668.29[6] Edit this on Wikidata / 4 September 2024; 2 days ago (4 September 2024)
Android129.0.6668.31[7] Edit this on Wikidata / 4 September 2024; 2 days ago (4 September 2024)
iOS129.0.6668.31[8] Edit this on Wikidata / 4 September 2024; 2 days ago (4 September 2024)
Written inC++, assembly, Python, JavaScript
EngineWebKit, V8 JavaScript engine
Operating systemAndroid (4.0 and later)
iOS (4.3 or later)
Linux (+GCC v4.6 & +GTK v2.20)
OS X (10.6 and later)
Windows (XP Service Pack 2 and later)
Available in53 languages
TypeWeb browser, mobile web browser
LicenseFreeware under Google Chrome Terms of Service[9][note 1]
Websitewww.google.com/chrome

Google Chrome is a freeware web browser[9] developed by Google that uses the WebKit layout engine (version 28[10] and later use Blink,[11] a fork of WebKit,[12] except on iOS). It was released as a beta version for Microsoft Windows on September 2, 2008, and as a stable public release on December 11, 2008. As of April 2013, according to StatCounter, Google Chrome has a 39% worldwide usage share of web browsers making it the most widely used web browser in the world.[13] Net Applications, however, indicates that Chrome is only third when it comes to the size of its user base, behind Internet Explorer and Firefox.[14]

In September 2008, Google released the majority of Chrome's source code as an open source project called Chromium,[15][16] on which Chrome releases are still based.

History

Google's 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 Sergey Brin and Larry Page hired several Mozilla Firefox developers and built a demonstration of Chrome, however, Schmidt admitted that "It was so good that it essentially forced me to change my mind."[17]

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.[18] Copies intended for Europe were shipped early and German blogger Philipp Lenssen of Google Blogoscoped[19] made a scanned copy of the 38-page comic available on his website after receiving it on September 1, 2008.[20] Google subsequently made the comic available on Google Books[21] and mentioned it on their official blog along with an explanation for the early release.[22]

Public release

An early version of Chromium for Linux, explaining the difference between Chrome and Chromium

The browser was first publicly released for Microsoft Windows (XP and later versions) on September 2, 2008 in 43 languages, officially a beta version.[23]

On the same day, a CNET news item[24] 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.[25] 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.[26]

Chrome quickly gained about 1% usage share.[22][27][28][29] 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.[30]

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.[31] The first official Chrome OS X and Linux developer previews[32] were announced on June 4, 2009 with a blog post[33] 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.[34][35] Google Chrome 5.0, announced on May 25, 2010, was the first stable release to support all three platforms.[36]

Chrome was one of the twelve browsers offered to European Economic Area users of Microsoft Windows in 2010.[37]

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, Skia Graphics Engine, SQLite, and a number of other open-source projects.[38] The V8 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.

Non-mobile web browser statistics on Wikimedia
Chrome
 
 44.06%
Internet Explorer
 
 22.08%
Firefox
 
 18.17%
Others
 
 9.07%
Opera
 
 3.38%
Safari
 
 3.24%
Non-mobile web browser usage for Wikimedia visitors for March 2013.[39]

Chrome uses the Blink rendering engine to display web pages. Blink only uses the base "WebCore" components while substituting its own components (such as its own multi-process architecture, unlike the one implemented natively by WebKit2 (Which Blink is based on).[40] Chrome is tested internally 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.[21]

Google created Gears for Chrome, which added features for web developers typically relating to the building of web applications, including offline support.[21] However, Google phased out Gears in favor of HTML5.[41]

On January 11, 2011 the Chrome product manager, Mike Jazayeri, announced that Chrome would remove H.264 video 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.[42] Despite this, on November 6, 2012, Google released a version of Chrome on Windows which added hardware-accelerated H.264 video decoding.[43] As of January 2013, there has been no further announcement about the future of Chrome H.264 support.

On February 7, 2012, Google launched Google Chrome Beta for Android 4.0 devices.[44] On many new devices with Android 4.1 and later preinstalled, Chrome is the default browser.[45]

On April 3, 2013, Google announced that it would fork WebCore 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.[40]

Enterprise deployment

In December 2010 Google announced that to make it easier for businesses to use Chrome they would provide an official Chrome MSI package. For business use it is helpful to have full-fledged MSI packages that can be customized via transform files (.mst) - but the MSI provided with Chrome is only a very limited MSI wrapper fitted around the normal installer, and many businesses find that this arrangement does not meet their needs.[46] The normal downloaded Chrome installer puts the browser in the user's local app data directory and provides invisible background updates, but the MSI package will allow installation at the system level, providing system administrators control over the update process[47] — it was formerly possible only when Chrome was installed using Google Pack. Google also created group policy objects to fine tune the behavior of Chrome in the business environment, for example setting automatic updates interval, disable auto-updates, a home page and to workaround their basic Windows design flaws and bugs if it comes to roaming profiles support, etc.[48] Until version 24 the software is known not to be ready for enterprise deployments with roaming profiles or Terminal Server/Citrix environments.[49]

Chromium

Main article: Chromium (web browser)

In September 2008, Google released a large portion of Chrome's source code as an open source project called Chromium. This move enabled third-party developers to study the underlying source code and to help port the browser to the OS X and Linux operating systems. The Google-authored portion of Chromium is released under the permissive BSD license.[50] Other portions of the source code are subject to a variety of open source licenses.[51] Chromium is similar to Chrome, but lacks built-in automatic updates, built-in PDF reader and built-in Flash player, as well as Google branding and has a blue-colored logo instead of the multicolored Google logo.[52][53] Chromium does not implement user RLZ tracking.[54][55][56]

Release history

Click "show" to expand the release history table below.

Release history

Legend:

Color Meaning
Red Old release
Green Stable release
Blue Beta release
Purple Dev release
Major version Release date Layout Engine[57][58] V8 engine version[59] Significant changes
0.2.149 2008-09-02 WebKit 522 0.3
0.3.154 2008-10-29
  • Improved plugin performance and reliability.
  • Spell checking for input fields.
  • Improved web proxy performance and reliability.
  • Tab and window management updates.
0.4.154 2008-11-24 WebKit 525
  • Bookmark manager with import and export support.
  • Privacy section added to the application options.
  • New blocked popup notification.
1.0.154 2008-12-11 WebKit 528
  • First stable release.
2.0.172 2009-05-24 WebKit 530 0.4
  • 35% faster JavaScript on the SunSpider benchmark.
  • Mouse wheel support.
  • Full-screen mode.
  • Full-page zoom.
  • Form auto-fill.
  • Sort bookmarks by title.
  • Tab docking to browser and desktop edges.
  • Basic Greasemonkey support.[61]
3.0.195 2009-10-12 WebKit 532 1.2
  • New "new tab" page for improved customization.
  • 25% faster JavaScript.
  • HTML5 video and audio tag support.
  • Lightweight theming.
4.0.249 2010-01-25 WebKit 532.5 1.3
  • Extensions.
  • Bookmark synchronization.
  • Enhanced developer tools.
  • Improved HTML5 support.
  • Performance improvements.
  • Full ACID3 pass.
  • HTTP byte range support.
  • Experimental new anti-reflected-XSS feature called "XSS Auditor".[62]
4.1.249 2010-03-17
5.0.375 2010-05-21 WebKit 533 2.1
6.0.472 2010-09-02 WebKit 534.3 2.2
  • Updated and more streamlined UI with simplified Omnibox.
  • New tab page.
  • Merged menu buttons.
  • Form auto-fill.
  • Expanded synchronization support to include extensions and auto-fill data.
  • Support for WebM videos.
  • Built-in PDF support (disabled by default).[66]
7.0.517 2010-10-21 WebKit 534.7 2.3.11.22
  • Implemented HTML5 parsing algorithm.
  • File API.
  • Directory upload via input tag.
  • OS X version gained AppleScript support for UI automation.[67]
  • Late binding enabled for SSL sockets: high priority SSL requests are now always sent to the server first.
  • New options for managing cookies.
  • Updated New Tab page to enable featuring of web applications.
8.0.552 2010-12-02 WebKit 534.10 2.4.9.19
  • Chrome Web Store.
  • Built-in PDF viewer that works inside Chrome's sandbox for increased security.
  • Expanded synchronization support to include web applications.
  • Improved plug-in handling.[68]
  • This release added "about:flags" to showcase experimental features such as Chrome Instant, side tabs on Windows, tabbed settings, Click to Play [clarification needed], background web applications, Remoting [clarification needed], Disable outdated plug-ins [clarification needed], XSS Auditor [clarification needed], Cloud Print Proxy [clarification needed], GPU-accelerated compositing, WebGL support for the canvas element, and a "tab overview" mode (like Exposé) for OS X.
9.0.597 2011-02-03 WebKit 534.13 2.5.9.6
  • WebGL enabled by default.
  • Adobe Flash sandboxing on Windows and Chrome Instant (a la Google Instant) option.[69]
  • WebP support.[70]
  • New flags: print preview, GPU-accelerated compositing, GPU-accelerated Canvas 2D, Google Native Client, CRX-less Web Apps, Web page prerendering, experimental Extension APIs, disable hyperlink auditing.
10.0.648 2011-03-08 WebKit 534.16 3.0.12.30
  • Google Cloud Print sign-in interface enabled by default.
  • Partially implemented sandboxing of the GPU process.[71][72]
  • Faster JavaScript performance due to incorporation of Crankshaft, an improved compiler for V8.[73]
  • Settings pages that open in a tab, rather than a dialog box.
  • Malware reporting and disabling outdated plugins.
  • Password sync added to Chrome Sync and enabled by default.
  • GPU accelerated video.
  • Background WebApps.
  • webNavigation extension API.[74]
11.0.696 2011-04-27 WebKit 534.24 3.1.8.16
  • HTML5 Speech Input API.[75]
  • Updated icon.[76]
12.0.742 2011-06-07 WebKit 534.30 3.2.10.21
  • Hardware accelerated 3D CSS.
  • New Safe Browsing protection against downloading malicious files.
  • Ability to delete Flash cookies from inside Chrome.[77]
  • Launch Apps by name from the Omnibox.
  • Integrated Sync into new settings pages.
  • Improved screen reader support.
  • New warning when hitting Command-Q on Mac.[77]
  • New flags: P2P API.
  • Existing tab on foreground on open.
  • Experimental new tab page.
  • Add grouping to tab context menu.
  • Run PPAPI Flash in the renderer process.
  • Multiple Profiles.
  • Removed Google Gears.
  • Print and Save buttons in the PDF viewer.[78]
13.0.782 2011-08-02 WebKit 535.1 3.3.10.30
  • Instant Pages (pre-rendering of Web pages).[79]
  • Native print interface and preview (Linux and Windows only).
  • Experimental new tab page.
  • Experimental Restrict Instant To Search option.
14.0.835 2011-09-16 3.4.14.21
  • Native Client (NaCl) enabled for apps in the Chrome Web Store.[80]
  • Web Audio API.
  • Additional Mac OS X Lion feature support.
  • Sync Encryption for all data.
  • Print preview on Mac.
  • Validation of HTTPS sites.[81]
  • Experimental Web Request extension API.
  • Experimental Content Settings extension API.[82]
15.0.874 2011-10-25 WebKit 535.2 3.5.10.24
  • Faster print preview.[83]
  • Redesigned new tab page on by default.[83]
  • JavaScript fullscreen API enabled by default.[83]
  • Inline installation of Chrome Web Store items by verified sites.
  • Omnibox History synchronization.[84]
  • Switched to FFmpeg native VP8 decoder.[85]
  • Extensions integrated into settings pages.
  • GPU Accelerated Canvas 2D disabled.
16.0.912 2011-12-13 WebKit 535.7 3.6.6.19
  • Multiple profiles on by default.[84]
  • Optional permissions in Chrome extensions, so the user can opt-in or opt-out of the optional permissions at installation time.[86]
  • Experimental support for side tabs was removed.[87]
17.0.963 2012-02-08 WebKit 535.11 3.7.12.29
  • Updated Omnibox prerendering of pages.[88]
  • Download scanning protection.[88]
  • New extensions APIs.[88]
  • Improved History tab.
  • Removal of "+" symbol from the "new tab" button.
  • Added limited support for changing user agent strings.
  • Adjustable margins in print preview.[89]
  • Search engine synchronization.[90]
  • Disabled GAIA profile info.[91]
18.0.1025 2012-03-28 WebKit 535.19 3.8.9.19
  • Hardware-accelerated Canvas2D graphics.[92]
  • WebGL without the need of 3D graphics hardware through the software rasterizer SwiftShader.[92]
  • Brighter "new tab" button.[93]
19.0.1084 2012-05-15 WebKit 536.5 3.9.24.7
  • Access tabs between devices.[94]
  • Reorganized and searchable settings interface.
  • Added better spell check by using the Google search engine spell checker.
  • Added Web Store link to the bottom of New Tab page.
  • Experimental JavaScript Harmony (ECMAScript 6) support.[95]
  • Experimental Web Intents API.[96]
20.0.1132 2012-06-26 WebKit 536.10 3.10.6.0
  • Experimental touch friendly Template:Dabbr adjustments. Context menus have extra vertical padding between items.[97]
  • New tab button is bigger and wider
21.0.1180 2012-07-31 WebKit 537.1 3.11.10.6
  • Media Stream API (getUserMedia) enabled by default. (E.g. webcam access via JavaScript.)[98]
  • Gamepad API prototype available by default.
  • Added support for (pointer) and (hover) CSS media queries so sites can optimize their Template:Dabbr for touch when touch-screen support is available.
  • HTML5 audio/video and WebAudio now support 24-bit PCM wave files.
22.0.1229 2012-09-25 WebKit 537.4 3.12.19.4
  • New-style packaged apps are enabled by default.
  • New menu icon, replacing the wrench icon.
  • Added support for TLS 1.1.[99][100]
  • Added support for color management ICC v2 profiles by default.[101]
23.0.1271 2012-11-06 WebKit 537.11 3.13.7.1
  • Added Do Not Track preference[102]
  • Hardware video acceleration with 25% more efficient power consumption in some scenarios
  • Manager for site permission control
  • New icon for Chrome Web Store when opening new tab
  • PPAPI Flash Player (or Pepper-based Flash Player) replaced the NPAPI Flash Player on Mac also.[103]
24.0.1312 2013-01-10 WebKit 537.17 3.14.5.0
25.0.1364 2013-02-21
2013-02-27
(Android) 		WebKit 537.22 3.15.11.5

Android version (update from 16):

  • Newer V8 JavaScript engine
  • Audio now continues to play while Chrome is in the background
  • Support for pausing audio in Chrome when phone is in use
26.0.1410 2013-03-26
2013-04-03
(Android) 		WebKit 537.31 3.16.14.9
  • Improved spell checker (grammar and homonym checking)[111]
  • Desktop shortcuts for multiple users (profiles) on Windows[111]
  • Asynchronous DNS resolver on Mac and Linux[111]

Android version:[112]

  • Autofill sync
  • Password sync
  • Performance and stability improvements
27.0.1453 2013-05-21
2013-05-22 (Android) 		WebKit 537.36 3.17.6.14
  • Resource handling optimized for faster page loads.[113]
  • Improved Omnibox predictions and spelling correction.[113]
  • syncFileSystem API for Google Drive data synchronization.[113]
  • Stop packaging Manifest version 1.0 extensions.[114]

Android version:[115]

  • Fullscreen on phones (scrolling down the page makes the toolbar disappear).
  • Simpler searching (the query stays visible in the omnibox, making it easier to edit)
  • Client-side certificate support
  • Tab history on tablets
  • "A ton of stability and performance fixes"
28.0.1500 2013-05-23 Blink 537.36 3.18.5.5
29.0.1521 2013-05-29 Blink 537.36 3.19.6.1

Notes:

  • All versions support Windows. OS X and Linux are supported starting with version 5.0.375.The Android 4.0 platform is first supported in 0.16.4130.199 (Chrome for Android).[119][120][121]
  • As of Chrome 26, there will be no more updates for the browser on Linux systems that can't run GCC 4.6 or later and GTK version earlier than 2.24, such as RHEL 6's 2.18 will not be supported. Ubuntu Lucid 10.04 LTS and Debian 6's 2.20 will be marked as deprecated.[122]
  • Old development and beta builds are not shown after they become stable releases.

Features

Google Chrome aims to be secure, fast, simple[123] and stable. There are extensive differences from its peers in Chrome's minimalistic user interface,[21] which is atypical of modern web browsers.[124] For example, Chrome does not render RSS feeds.[125] One of Chrome's strengths is its application performance and JavaScript processing speed, both of which were independently verified by multiple websites to be the swiftest among the major browsers of its time.[126][127] 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.[128] 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.[129] Both Internet Explorer 9 and Safari (version 6) have since merged the search and address bar.

Bookmark & Settings Sync

Google Chrome give you the ability to sync your bookmarks and settings onto your Google Account's profile. This will take your settings and bookmarks and place then on your account which gives you the option to essentially log into your Google Account on any supported device inside of Google Chrome and your settings and bookmarks will return.[130]

Web standards support

The results of the Acid3 test on Google Chrome 4.0

The first release of Google Chrome passed both the Acid1 and Acid2 tests. Beginning with version 4.0, Chrome has passed all aspects of the Acid3 test.[62]

Chrome has currently quite good support for JavaScript/ECMAScript according to Ecma International's ECMAScript standards conformance Test 262[131] (version ES5.1 of 2012-05-18). This test reports as final score the number of tests a browser failed; hence lower scores are better. In this test, Chrome version 26.0.1410 scored 10/11572. For comparison, Firefox 19 scored 193/11752 and Internet Explorer 9 has a score of 600+, while Internet Explorer 10 has a score of 7.

On the official CSS 2.1 test suite by standardization organization W3C, WebKit, the Chrome rendering engine, passes 89.75% (89.38% out of 99.59% covered) CSS 2.1 tests.[132]

On the HTML5 test (version 4.0), Chrome 26 on desktop scores 468 out of 500, with 13 bonus points, which makes it the second place among desktop browsers.[133] Chrome 26 for Android holds the first place among tablet browsers[134] and the second place among mobile browsers,[135] with 417 points and 11 bonus points.

Security

See also: Browser security

Chrome periodically retrieves 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".[21]

Chrome uses a complex process-allocation model to allocate different tabs to fit into different processes to prevent what happens in one tab from affecting what happens in others.[136] Following the principle of least privilege, each process is stripped of its rights and can compute, but cannot interact with sensitive areas (e.g. OS memory, user files) — this is similar to the "Protected Mode" used by Internet Explorer 9 and 10. The Sandbox Team is said to have "taken this existing process boundary and made it into a jail." This enforces a 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.[137] On Linux sandboxing uses the seccomp mode.[138][139]

In December 2011 a report by Accuvant, funded by Google, rated the sandbox security of Google Chrome 12 and 13 as better than either Internet Explorer 9 or Mozilla Firefox 5.[140]

Security vulnerabilities

See also: Comparison of web browsers § Security and vulnerabilities

No security vulnerabilities in Chrome had been successfully exploited in the three years of Pwn2Own from 2009–11.[141]

However, Chrome was the first browser to be defeated at Pwn2Own 2012, by a French team who used zero day exploits to take complete control of a fully patched 64-bit Windows 7 PC using a booby-trapped website that overcame Chrome's sandboxing.[142]

Chrome was also compromised twice at the 2012 CanSecWest Pwnium.[142][143][144] Google's official response to the exploits was delivered by Jason Kersey, who congratulated the researchers, noting "We also believe that both submissions are works of art and deserve wider sharing and recognition."[145] Fixes for these vulnerabilities were deployed within 10 hours of the submission.[146][147]

The browser Version 23 fixed 15 security vulnerabilities of which six were rated as high sensitivity.[148]

Malware blocking

A study has shown that users are four times more likely to be tricked into downloading malware than be compromised by an exploit.[149] A May 2011 study reported Chrome 10 blocked only 13% of malicious URLs, the same as Safari and Firefox, behind Internet Explorer 9 which blocked 92%, and 100% with application-based filtering enabled. Referring to that study, Ars Technica wrote in July 2011 that "Even with the false positives, Microsoft's approach appears to be more secure."[150][151] A February 2012 study reported that Chrome 15 had a 34.1% malware-blocking rate.[152][153] Neither study analyzed exploits that install malware without the user being aware (for example clickjacking and drive-by downloads).

Google introduced new security functionality — download scanning protection — in Chrome 17.[88][154]

Plugins

  • Chrome supports plug-ins with the Netscape Plugin Application Programming Interface (NPAPI),[155] so that plug-ins (for example Adobe Flash Player) run as an unrestricted separate process outside the browser and cannot be sandboxed as tabs are. ActiveX is not supported.[155] On March 30, 2010 Google announced that the latest development version of Chrome would bundle Adobe Flash with the browser, eliminating the need to download and install it separately. Flash would be kept up to date as part of Chrome's own updates.[156] Java applet support is available in Chrome with Java 6 update 12 and above.[157] Support for Java under OS X was provided by a Java Update released on May 18, 2010.[158]
  • On August 12, 2009, Google introduced a replacement for NPAPI that is more portable and more secure[159] called Pepper Plugin API (PPAPI).[160] The default bundled PPAPI Flash Player (or Pepper-based Flash Player) was available on Chrome OS first, then replaced the NPAPI Flash Player on Linux from Chrome version 20, on Windows from version 21 (which also reduced Flash crashes by 20%),[161] and eventually came to OS X at version 23.[103]

Privacy

Privacy mode

The private browsing feature called Incognito mode prevents the browser from permanently storing any history information or cookies from the websites visited.[162] Incognito mode is similar to the private browsing feature in other web browsers. Chrome was the second browser to implement this feature, after Safari.

User tracking

Chrome sends details about its users to Google through both optional and non-optional user tracking mechanisms.[163]

Tracking methods
Method[164] Information sent When Optional? If optional, is default?
Installation Randomly generated token included in installer. Used to measure success rate of Google Chrome once at installation.[165]

On installation

No n/a
RLZ identifier[166] Encoded string, according to Google, contains non-identifying information about where Chrome was downloaded from and its installation week, and is used to measure promotional campaigns.[165] Google provides the source code to decode this string.[56]
  • On Google search query
  • On first launch and first use of address bar[165]
 Partial[note 2][165] n/a
clientID[167] Unique identifier along with user preferences, logs of usage metrics and crashes. Un­known Yes[168] No
Omnibox predictions[167] Text typed into the address bar. While typing Yes Yes
Page not found Text typed into the address bar. Upon receiving "Server not found" response Yes Yes
Google Update (Windows) Information about how often Chrome is used, details about the OS and Chrome version. Un­known No n/a
Google Software Update (OS X)

Some of the tracking mechanisms can be optionally enabled and disabled through the installation interface[169] and through the browser's options dialog.[167] Unofficial builds, such as SRWare Iron and CoolNovo (previously known as ChromePlus), seek to remove these features from the browser altogether.[164] The RLZ feature is not included in the Chromium browser either.[56]

In March 2010, Google devised a new method to collect installation statistics: the unique ID token included with Chrome is now only used for the first connection that Google Update makes to its server.[170]

The optional suggestion service included in Google Chrome has been criticized because it provides the information typed into the Omnibox to the search provider before the user even hits return. This allows the search engine to provide URL suggestions, but also provides them with web usage information tied to an IP address.[171]

The optional feature to use a web service to help resolve spelling errors has privacy implications.[172]

Do Not Track

Main article: Criticism of Google § Do Not Track

In February 2012, Google announced that Chrome would support Do Not Track by the end of 2012 and the protocol was implemented on version 23.[173]

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.[21]

Several websites performed benchmark tests using the SunSpider JavaScript Benchmark tool as well as Google's own set of computationally intense benchmarks, which include ray tracing and constraint solving.[174] They unanimously reported that Chrome performed much faster than all competitors against which it had been tested, including Safari (for Windows), Firefox 3.0, Internet Explorer 7, Opera, and Internet Explorer 8.[175][176][177][178][179][180] However in more recent independent tests of JavaScript performance, Chrome has been scoring just behind Opera's Presto engine since it was updated in version 10.5.[181]

On September 3, 2008, Mozilla responded by stating that their own TraceMonkey JavaScript engine (then in beta), was faster than Chrome's V8 engine in some tests.[182][183][184] John Resig, Mozilla's JavaScript evangelist, further commented on the performance of different browsers on Google's own suite, commenting on Chrome's "decimating" of the other browsers, but he questioned whether Google's suite was 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.[185]

Two weeks after Chrome's launch, the WebKit team announced a new JavaScript engine, SquirrelFish Extreme,[186] citing a 36% speed improvement over Chrome's V8 engine.[187][188][189]

Chrome uses DNS prefetching to speed up website lookups,[190] as other browsers like Firefox,[191] Safari,[192] Internet Explorer (called DNS Pre-resolution),[193] and in Opera as a UserScript (not built-in).[194]

Chrome utilizes the faster SPDY protocol instead of HTTP[195][196] when communicating with servers that support it, such as Google services, Facebook, Twitter, and other websites.

Stability

A multi-process architecture is implemented in Chrome[197] where, by default, a separate process is allocated to each site instance and plugin. This procedure is termed process isolation,[198] and it prevents tasks from interfering with each other, raising security and stability. An attacker successfully gaining access to one application gains access to no others,[199] and failure in one instance results in a Sad Tab screen of death, similar to the well-known Sad Mac, but only one 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 instance and no longer needs further memory allocations.[21] This architecture is being adopted in upcoming versions of Safari[200] and Firefox.[201]

Chrome includes a process management utility called Task Manager which lets users see what sites and plugins are using the most memory, downloading the most bytes and overusing the CPU and provides the ability to terminate them.[21] Chrome Version 23 ensures its users an improved battery life for the systems supporting Chrome's GPU accelerated video decoding.[202][203]

User interface

By default, the main user interface includes back, forward, refresh/cancel and menu buttons. A home button is not shown by default, but can be added through the Settings page to take the user to the new tab page or a custom home page.[204]

Tabs are the main 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, with their state, can be transferred seamlessly between window containers by dragging. Each tab has its own set of controls, including the Omnibox.[21]

The Omnibox is a URL box that combines the functions of both the address bar and search box. If a user enters the URL of a site previously searched from, Chrome allows pressing Tab to search the site again directly from the Omnibox. When a user starts 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 Instant), and popular searches. Although Instant can be turned off, suggestions based on previously visited sites cannot be turned off. Chrome will also autocomplete the URLs of sites visited often.[21] If a user types keywords into the Omnibox that don't match any previously visited websites and presses enter, Chrome will conduct the search using the default search engine.

One of Chrome's differentiating features is the New Tab Page, which can replace the browser home page and is displayed when a new tab is created. Originally, this showed thumbnails of the nine most visited web sites, along with frequent searches, recent bookmarks, and recently closed tabs; similar to Internet Explorer and Firefox with Google Toolbar, or Opera's Speed Dial.[21] In Google Chrome 2.0, the New Tab Page was updated to allow users to hide thumbnails they did not want to appear.[205]

Starting in version 3.0, the New Tab Page was revamped to display thumbnails of the eight 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.[206]

File:Chrome Logo.svg
Google Chrome logos. Top: 3D motif from project start until March 2011. Bottom: 2D motif from March 2011 to present.

Chrome includes a bookmarks submenu that lists the user's bookmarks, provides easy access to Chrome's Bookmark Manager, and allows the user to toggle a bookmarks bar on or off.

For web developers, Chrome features an element inspector similar to the one in Firebug.[190]

Chrome has special URLs that load application-specific pages instead of websites or files on disk. Chrome also has a built-in ability to enable experimental features. Originally called about:labs, the address was changed to about:flags to make it less obvious to casual users.[207][208]

In March 2011, Google introduced a new simplified logo to replace the previous 3D logo that had been used since the project's inception. Google designer Steve Rura explained the company reasoning for the change: "Since Chrome is all about making your web experience as easy and clutter-free as possible, we refreshed the Chrome icon to better represent these sentiments. A simpler icon embodies the Chrome spirit – to make the web quicker, lighter, and easier for all."[76]

Desktop shortcuts and apps

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).[21]

This feature, according to Google, will be enhanced with the Chrome Web Store, a one-stop web-based web applications directory which opened in December 2010.[209][210]

Chrome Web Store

Main article: Chrome Web Store

Announced on December 7, 2010, the Chrome Web Store allows users to install web applications as extensions to the browser, although most of these function simply as links to popular web pages and/or games, but some of the apps like Springpad do provide extra features like offline access. The themes and extensions have also been tightly integrated into the new store, allowing users to search the entire catalog of Chrome extras.[211]

The Chrome Web Store was opened on February 11, 2011 with the release of Google Chrome 9.0.[212]

Extensions

Main article: Google Chrome Extensions

On September 9, 2009, Google enabled extensions by default on Chrome's Dev channel, and provided several sample extensions for testing.[213] In December, the Google Chrome extension gallery beta began with over 300 extensions.[35][214]

Along with Google Chrome 4.0, the extension gallery was officially launched on January 25, 2010, containing over 1500 extensions.[215]

As of February 4, 2011, the extension gallery featured more than 11,500 extensions,[216] including official extensions from the Independent,[217] CEOP,[218] Transport for London,[219] Cricinfo,[220] Web of Trust (WOT)[221] and FIFA.[222]

Many Chrome extensions, once installed, have access to the user's data. There are three levels of permissions that an app or extension may request.[223]

Themes

Starting with Google Chrome 3.0, users can install themes to alter the appearance of the browser.[224] Many free third-party themes are provided in an online gallery,[225] accessible through a "Get themes" button in Chrome's options.[226]

Automatic web page translation

Starting with Google Chrome 4.1 the application added a built-in translation bar using Google Translate. Translation is currently available for 52 languages.[227]

Release channels and updates

On January 8, 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.[228][229] On July 22, 2010, Google announced it will ramp up the speed it will release new stable versions; they will shorten the release cycles from quarterly to 6 weeks.[230] The faster release cycle brought a fourth channel: the "Canary" release; the name refers to using canaries in coal mines, so if a change "kills" Chrome Canary, they will block it from the developer build. Canary will be "the most bleeding-edge official version of Chrome and somewhat of a mix between Chrome dev and the Chromium snapshot builds". Canary releases run side-by-side with any other channel; it is not linked to the other Google Chrome installation and can therefore run different synchronization profiles, themes, and browser preferences.[231] It does not natively include the option to be the default browser, although on OS X it can be set through Safari's preferences. Canary was Windows-only at first; an OS X version was released on May 3, 2011.[232]

Chrome beta for Android was launched on January 10, 2013; like Canary, it runs side-by-side with the stable channel for Android.[233][234]

Chrome automatically keeps itself up-to-date. The details differ by platform. On Windows, it uses Google Update, and auto-update can be controlled via Group Policy,[235] or users can download a standalone version that does not autoupdate.[236][237] On OS X, it uses Google Update Service, and auto-update can be controlled via the OS X "defaults" system.[238] On Linux, it lets the system's normal package management system supply the updates.

Color management

Main article: Color management

Chrome supports color management by using the system provided ICC v2 and v4 support on OS X, and from version 22 supports ICC v2 profiles by default on other platforms.[101]

Platforms

Chrome is available for[239]

  • Windows: XP Service Pack 2 or later / Vista / 7 / 8.
  • OS X: 10.6 or later[240]
  • Linux: Available for installation prior Chrome 26, however only systems that can support GCC v4.6 and GTK v2.20 or later can update Chrome.

As of 2012, 32-bit and 64-bit builds are available for Linux, with only 32-bit builds available for OS X and Windows at this time.[241][242]

  • iOS, iPhone, iPod touch, iPad
  • Android 4.0 or later

Android version

Main article: Google Chrome for Android

A beta version for Android 4.0 devices was launched on February 7, 2012, available for a limited number of countries from Google Play.[243]

Notable features: synchronization with desktop Chrome to provide the same bookmarks and view the same browser tabs,[244] page pre-rendering,[245] hardware acceleration.[246]

Many of the latest HTML5 features: almost all of the Web Platform’s features: GPU-accelerated canvas, including CSS 3D Transforms, CSS animations, SVG, WebSocket (including binary messages), Dedicated Workers; it has overflow scroll support, strong HTML5 video support, and new capabilities such as IndexedDB, WebWorkers, Application Cache and the File APIs, date and time pickers, parts of the Media Capture API.[245][247] Also supports mobile oriented features such as Device Orientation and Geolocation.[247]

Mobile customisations: swipe gesture tab switching,[244] link preview allows zooming in on (multiple) links to ensure the desired one is clicked,[244] font size boosting to ensure readability regardless of the zoom level.[247]

Missing in the mobile version are sandboxed tabs,[245][248] Safe Browsing,[245] apps or extensions,[246] Adobe Flash (now and in future),[246] Native Client.[246]

Development changes: remote debugging,[245][249] part of the browser layer has been implemented in Java, communicating with the rest of the Chromium and WebKit code through Java Native Bindings.[247] The code of Chrome for Android is a fork of the Chromium project. It is a priority to upstream most new and modified code to Chromium and WebKit to resolve the fork.[247]

The April 17, 2012 update included the availability to access in 31 additional languages and in all countries where Google Play is available. A desktop version of a website can also be requested as opposed to a mobile version. In addition, Android users can now add bookmarks to their Android home screens if they choose and decide which apps should handle links opened in Chrome.[250]

On the June 27, 2012 Google Chrome for Android exited beta and became stable.[251]

Chrome 18.0.1026311, released at September 26, 2012 was the first version of Chrome for Android to support Intel x86 based mobile devices.[252]

Google is aiming to bring Chrome for Android in line with the desktop version, first with Chrome 25. They released a separate Chrome for Android beta channel on January 10, 2013, with version 25.[233]

Chrome OS

Main article: Google Chrome OS

Google Chrome is the basis of Google's Chrome OS operating system that ships on specific hardware from Google's manufacturing partners.[253] The user interface has a minimalist design resembling the Google Chrome browser. Chrome OS is aimed at users who spend most of their computer time on the Web; the only applications on the devices are a browser incorporating a media player and a file manager.[254][255][256][257][258]

Google announced Chrome OS on July 7, 2009.[259]

iOS version

Google Chrome for iOS is the mobile rendition of Google's Chrome web browser for Apple's iOS operating system as its name implies. It was released on the App Store on June 26, 2012. It supports the iPad, iPhone, and iPod touch, and requires that the device have at least iOS version 4.3 installed.[260] Per Apple's requirements for browsers released through the App Store, this version of Chrome uses the iOS WebKit, that is the mobile Safari iOS engine and components, but restricted from using their Nitro JavaScript engine.[261]

In a review by Chitika on July 18, 2012, Google Chrome was noted as having 1.5% of the iOS web browser market.[262]

Metro version

File:Google Chrome Windows 8 Mode.jpg
Google Chrome in Windows 8 Mode

In June 2012, Google released the developers version of Chrome 21.[263] On Windows 8, this version of Chrome can be run in the Metro UI as long as it is set as the default browser on the computer. The Metro version of Chrome looks identical to its desktop counterpart and does not support the standard design principles of the Metro UI.

Usage

Usage share of web browsers according to StatCounter.[264]
The most used web browser by country in 2020[265]
Further information: Usage share of web browsers and Browser wars

In 2008, Matthew Moore in the The Daily Telegraph summarized 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."[266]

Initially, 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".[267] But by February 25, 2010, BusinessWeek had reported that "For the first time in years, energy and resources are being poured into browsers, the ubiquitous programs for accessing content on the Web. Credit for this trend—a boon to consumers—goes to two parties. The first is Google, whose big plans for the Chrome browser have shaken Microsoft out of its competitive torpor and forced the software giant to pay fresh attention to its own browser, Internet Explorer. Microsoft all but ceased efforts to enhance IE after it triumphed in the last browser war, sending Netscape to its doom. Now it's back in gear."[268] 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 would not affect Google's revenue relationship with Mozilla.[269][270]

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 QuickLaunch 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.

— PC World[271]

Chrome overtook Firefox in November 2011. As of September 2012, according to StatCounter, Google Chrome had 34% worldwide usage share, making it the most widely used web browser, while Internet Explorer had 33% and Firefox had 22%.[13][272]

Along with Safari and Mozilla Firefox, Chrome receives a weekend "bump", which boosts its marketshare by as much as three percentage points on week-ends, at the expense of Internet Explorer.[273]

It was reported by StatCounter, a web analytics company, that for the single day of Sunday, March 18, 2012 Chrome was the most used web browser in the world for the first time. Chrome secured 32.7% of the global web browsing on that day, while Internet Explorer followed closely behind with 32.5%.[274]

From May 14–21, 2012 Google Chrome was responsible for more Internet traffic than Microsoft's Internet Explorer (for the first time), which long had held its spot as the most used web browser in the world.[275] According to StatCounter, 31.88% of web traffic was generated by Chrome for a sustained period of one week and 31.47% by Internet Explorer. Though Chrome has topped Internet Explorer for single day's usage in the past, this is the first time it has led for one full week.[276]

At the 2012 Google I/O developers' conference, Google claimed that there were 310 million active users of Chrome, almost double the number in 2011, which was stated as 160 million active users.[277]

See also

Notes

  1. ^ Google Chrome's WebKit layout engine and V8 JavaScript engine are all Free and open source software. Other parts may be open-source or proprietary. Google Chrome's Terms of Service makes the entire package proprietary freeware. (see Terms of Service text, section 9.2).
  2. ^ Browser must be downloaded directly from the Google Chrome website to opt-out of the RLZ identifier.

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