browsers for iOS must use WebKit as their engine. Google originally used WebKit for its Chrome browser but eventually forked it to create the Blink engine. All Chromium-based browsers use Blink, as do applications built with CEF, Electron, or any other framework that embeds Chromium. Microsoft has two proprietary engines, Trident and EdgeHTML. Trident is used in the Internet Explorer browser. EdgeHTML was the original engine of the Edge browser, but that was remade with the Blink engine. EdgeHTML is still used in some UWP apps. Mozilla develops the Gecko engine for its Firefox browser and the Thunderbird email client. Timeline Only the duration of active development is shown, which is when relevant new Web standards continue to be added to the engine. See also Comparison of browser engines References Layout engines Web browsers