![]() Google Chrome debuted in September 2008, and along with its release, the Chromium source code was also made available, allowing builds to be constructed from it. This versioning scheme and the branch points that occur every six to seven weeks are from Google Chrome and its development cycle. īuilds are identified by a four-part version number that is. The Chromium continuous integration system automatically builds and tests the codebase several times a day. Participants are identified by their email addresses. The bug tracking system is a publicly accessible website. Python is the main language of the build system, which also has special configuration files for Google's GN tool. Support for mobile operating systems requires special languages: for Android both Java and Kotlin, and for iOS both Objective-C and Swift. Third-party libraries that provide essential functionality, such as SQLite and numerous codecs, are written in C, C++, or beginning in 2023, the newer Rust language. ![]() An extensive collection of web platform tests is also written in these languages plus XML. The rest of the user interface, called the WebUI, is implemented in HTML, CSS, and JavaScript (usually via TypeScript transpilation). This includes the Blink and V8 engines, the implementation of HTTP and other protocols, the internal caching system, and most of the user interface. Programming languages Ĭ++ is the primary language, comprising over half of the codebase. This divergence from Apple's version increased over time, so in 2013 Google officially forked its version as the Blink engine. However, Google's novel multi-process design required engine changes. The browser engine was originally based on Apple's WebKit, which Google deemed the "obvious choice" of available options. Īnother important design decision was for the browser's user interface to be minimalistic. This was later refined as per-process website isolation, providing additional security. Compared to single-process designs, this architecture has better responsiveness with many browser tabs open and security benefits of process isolation, but with the trade-off of higher memory usage. Google designed the first multi- process browser. Some employees of these companies also have email addresses. The Chromium browser codebase is widely used, so others have made important contributions, most notably Microsoft, Igalia, Yandex, Intel, Samsung, LG, Opera, Vivaldi, and Brave. However, in terms of governance, the Chromium projects are not independent entities Google retains firm control of them. Google refers to this project and the offshoot ChromiumOS as "the Chromium projects", and its employees use email addresses for this development work. Contributors Ĭhromium has been a Google project since its inception, and Google employees have done the bulk of the development work. The Chromium browser codebase contains about 38 million source lines of code. Unlike Chromium, Chrome is not open-source, so its binaries are licensed as freeware under the Google Chrome Terms of Service. While Chrome has the same user interface functionality as Chromium, it changes the color scheme to the Google-branded one. Then the open-source release was named "Chromium" because chromium metal is used to make chrome plating. Google first chose the name "Chrome" for its browser.
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