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Ajax (also AJAX / ˈ eɪ dʒ æ k s /; short for "asynchronous JavaScript and XML" [1] [2]) is a set of web development techniques that uses various web technologies on the client-side to create asynchronous web applications.
JavaScript added support for async/await in 2017 as part of ECMAScript 2017 JavaScript edition. Rust added support for async/await with version 1.39.0 in 2019 using the async keyword and the .await postfix operator, both introduced in the 2018 edition of the language. [11] C++ added support for async/await with version 20 in 2020 with 3 new ...
Unlike in Selenium 1, where the Selenium server was necessary to run tests, Selenium WebDriver does not need a special server to execute tests. Instead, the WebDriver directly starts a browser instance and controls it. However, Selenium Grid can be used with WebDriver to execute tests on remote systems (see below).
While most are able to support common browser features (HTML parsing, cookies, XHR, some JavaScript, etc.), they do not render the DOM and have limited support for DOM events. They usually perform faster than full browsers, but are unable to correctly interpret many popular websites. [18] [19] [20]
Program flow using asynchronous XHR callbacks can present difficulty with readability and maintenance. ECMAScript 2015 (ES6) added the promise construct to simplify asynchronous logic. Browsers have since implemented the alternative fetch() interface to achieve the same functionality as XHR using promises instead of callbacks.
Lazy loading (also known as asynchronous loading) is a technique used in computer programming, especially web design and web development, to defer initialization of an object until it is needed. It can contribute to efficiency in the program's operation if properly and appropriately used.
Asynchronous module definition (AMD) is a specification for the programming language JavaScript. It defines an application programming interface (API) that defines code modules and their dependencies, and loads them asynchronously if desired. Implementations of AMD provide the following benefits: Website performance improvements.
Asynchronous Javascript testing framework Tyrtle: Yes: Yes [241] Testing framework which allows expressive assertions and interactive test output wru: Compatible: Yes: Yes [242] General purpose environment agnostic sync/async JavaScript test framework. Compatible with any browser, desktop or mobile, node.js, Rhino, and phantom.js. Tiny ...