Google Chrome

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Google Chrome
Google Chrome icon (2011).svg
Google Chrome screenshot.png
Google Chrome on Windows 8
Developer(s) Google Inc.
Initial release September 2, 2008 (2008-09-02)
Stable release

Microsoft Windows
33.0.1750.154
 (March 14, 2014; 4 months ago (2014-03-14))[1]

Linux and Mac OS X
33.0.1750.152
 (March 14, 2014; 4 months ago (2014-03-14))[2]
Mobile versions:
Android
33.0.1750.166 (ARM, x86)
 (March 14, 2014; 4 months ago (2014-03-14))[3]
iOS
33.0.1750.15
 (March 10, 2014; 4 months ago (2014-03-10))[4]

Development status Active
Written in C++, assembly, Python, JavaScript
Operating system Android (4.0 and later)
iOS (4.3 or later)
Linux
OS X (10.6 and later)
Windows (XP SP2 and later)
Engine WebKit, V8 JavaScript engine
Available in 50 languages
Type Web browser, mobile web browser
License Freeware under Google Chrome Terms of Service[5][note 1]
Website www.google.com/chrome

Google Chrome is an open source web browser made by Google. It builds on parts from other open source software, including WebKit and Mozilla.[6] The name comes from the graphical user interface frame, or "chrome", of web browsers. The open source project behind Google Chrome is known as Chromium.[7]

The first version was a beta for Microsoft Windows was released on September 2, 2008 in 43 languages.[8] OS X and Linux versions were released in December 2009.[9][10]

Announcement[change | change source]

The release announcement was going to be made on 3 September 2008, and a comic by Scott McCloud was to be sent to journalists and bloggers explaining the features of and reasons for the new browser.[11] Copies that were for Europe were shipped early and German blogger Philipp Lenssen of Google Blogoscoped[12] made a scanned copy of the 38-page comic available on his website after receiving it on 1 September 2008.[13] Google then made the comic available on Google Books and their website[14] and referenced it on its official blog along with an explanation for the early release.[6] As of September 2, 2008 Google has a link to Google Chrome on their main page.[15]

Design[change | change source]

Security[change | change source]

Blacklists
Chrome downloads updates of two blacklists (one for phishing and one for malware) and warns users when they try 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". In the process of maintaining these blacklists, Google also notifies the owners of listed sites who may not be aware of the presence of the harmful software.[13]
Sandboxing
Each tab in Chrome is sandboxed to "prevent malware from installing itself" or "using what happens in one tab to affect what happens in another". Following the principle of least privilege, each process is stripped of its rights and can compute but can't write files or read from sensitive areas (e.g. documents, desktop), this is similar to "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"; for example malicious software running in one tab is unable to sniff credit card numbers, interact with the mouse or tell "Windows to run an executable on start-up" and will be terminated when the tab is closed. 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.[13]
Plugins
Plugins such as Adobe Flash Player are typically not standardised and as such cannot be sandboxed like tabs. 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.
Incognito
Chrome includes an Incognito mode (similar to Safari's Private Browsing and Internet Explorer 8's InPrivate) which "lets you browse the web in complete privacy because it doesn’t record any of your activity" and discards cookies. When enabled for a window "nothing that occurs in that window is ever logged on your computer."[6]

Speed[change | change source]

JavaScript
The Javascript virtual machine was considered a sufficiently important project to be split off (like Adobe/Mozilla's Tamarin) and handled by a dedicated team in Denmark. Existing implementations were designed "for small programs, where the performance and interactivity of the system weren't that important" but web applications like Gmail "are using the web browser to the fullest when it comes to DOM manipulations and Javascript". The resulting V8 JavaScript engine was designed for speed and introduces new features with that in mind such as hidden class transitions, dynamic code generation, and precise garbage collection.[13] Tests by Google show that V8 is about twice as fast as Firefox 3 and the Safari 4 beta.[16]

User interface[change | change source]

The main User Interface includes back, forward, refresh, bookmark, go and cancel options similar to Safari browser, while the settings location looks like Internet Explorer 7/8. The minimize, maximize and close window buttons are based on Windows Vista

Gears
Chrome includes Gears which adds developer features that may or may not become web standards, typically relating to the building of web applications (including offline support).[13]
New Tab Page
Chrome replaces the browser home page which is displayed when a new tab is created with a New Tab Page. This shows thumbnails of the eight most visited web sites along with the sites most often searched, recent bookmarks and recently closed tabs.[17] This concept appeared first with Opera's Speed Dial.[13]
Omnibox
The Omnibox is the URL box at the top of each tab, based on the one in Opera. It includes autocomplete functionality but will only autocomplete URLs that were manually entered (rather than all links), search suggestions, top pages (previously visited), popular pages (unvisited) and text search over history. Search engines can also be captured by the browser when used via the native user interface by pressing Tab.[13]
Popups
Popup windows "are scoped to the tab they came from" and will not appear outside the tab unless the user explicitly drags them out. It is not clear whether they also run in their own process.[13]
Rendering engine
Chrome uses the WebKit rendering engine on advice from the Android team. The WebKit engine is simple, memory efficient, useful on embedded devices and easy to learn for new developers.[13]
Tabs
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 (similar to Opera). This subtle change is in contrast to many existing tabbed browsers which are based on windows containing tabs. Tabs (including their state) can be seamlessly transferred between window containers by dragging. Each tab has its own set of controls, including the Omnibox URL box.[13]
Standards
Google Chrome fails the Acid 3 Test
Google Chrome passes the Acid2 test prior to window resizing
The first release of Google Chrome Beta (Build 1583) did not pass the Acid3 test; it scored 77/100 and does not render the image correctly. It passed the Acid2 test initially, but failed upon resizing. From version 4 onward, Google Chrome has passed the Acid1, 2,and 3 tests.[18]
Webapps
Webapps can be launched in their own streamlined window without the Omnibox URL box and browser toolbar. This limits the browser chrome so as not to "interrupt anything the user is trying to do", allowing web applications to run alongside local software (similar to Mozilla Prism, Adobe AIR and Fluid).[13]

Notes[change | change source]

  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).

References[change | change source]

  1. Laforge, Anthony (March 14, 2014). "Stable Channel Update". Chrome Releases. Blogger. http://googlechromereleases.blogspot.com/2014/03/stable-channel-update_14.html. Retrieved March 21, 2014.
  2. Laforge, Anthony (March 14, 2014). "Stable Channel Update". Chrome Releases. Blogger. http://googlechromereleases.blogspot.com/2014/03/stable-channel-update_14.html. Retrieved March 21, 2014.
  3. "Chrome for Android Update". Chrome Releases blog. Blogger. March 14, 2014. http://googlechromereleases.blogspot.hu/2013/07/chrome-for-android-update.html. Retrieved March 21, 2014.
  4. Google Inc. (March 10, 2014). "Chrome". App Store. Apple. http://itunes.apple.com/us/app/chrome/id535886823. Retrieved March 21, 2014.
  5. Google Chrome Terms of Service
  6. 6.0 6.1 6.2 Scott McCloud and Google Chrome team (2008-09-01). "Google Chrome By the Google Chrome team, comics adaptation by Scott McCloud". Google Books. http://books.google.com/books?id=8UsqHohwwVYC&printsec=frontcover#PPP1,M1. Retrieved 2008-09-01.
  7. http://code.google.com/chromium/
  8. "It was when not if... Google Chrome". September 2008. http://www.doeswhat.com/2008/09/02/it-was-when-not-if-google-chrome/. Retrieved September 2, 2008.
  9. Mark Larson (December 8, 2009). "Beta Update: Linux, Mac, and Windows". Google. http://googlechromereleases.blogspot.com/2009/12/beta-update-linux-mac-and-windows.html. Retrieved 2012-07-11.
  10. "Google Chrome for the holidays: Mac, Linux and extensions in beta". Googleblog.blogspot.com. http://googleblog.blogspot.com/2009/12/google-chrome-for-holidays-mac-linux.html. Retrieved 2012-07-11.
  11. Scott McCloud (2008-09-01). "Surprise!". Google Blogoscoped. http://smccloud.livejournal.com/15488.html. Retrieved 2008-09-01.
  12. Philipp Lenssen (2008-09-01). "Google Chrome, Google’s Browser Project". http://blogoscoped.com/archive/2008-09-01-n47.html. Retrieved 2008-09-01.
  13. 13.00 13.01 13.02 13.03 13.04 13.05 13.06 13.07 13.08 13.09 13.10 Philipp Lenssen (2008-09-01). "Google on Google Chrome - comic book". Google Blogoscoped. http://blogoscoped.com/google-chrome/. Retrieved 2008-09-01.
  14. "Google Chrome". Google Books. 2008-09-01. http://www.google.com/googlebooks/chrome/. Retrieved 2008-09-02.
  15. "Google Chrome". 2008-09-02. http://www.google.com/. Retrieved 2008-09-02.
  16. Limi, Alexander (2008-09-02). "Chrome: Benchmarks and more". http://limi.net/articles/google-chrome-benchmarks-and-more. Retrieved 2008-09-02.
  17. Philipp Lenssen. "Google Chrome Screenshots". Google Blogoscoped. http://blogoscoped.com/archive/2008-09-02-n72.html. Retrieved 2008-09-02.
  18. Anthony Laforge (January 25, 2010). Stable Channel Update "Stable Channel Update". Google. http://googlechromereleases.blogspot.com/2010/01/stable-channel-update_25.html Stable Channel Update. Retrieved May 25, 2010.

Other websites[change | change source]