![]() ![]() JavaScriptCore (Nitro) – Used by Safari.SpiderMonkey (C/C++) – Used by Mozilla Firefox.V8 (C++) – Used in Google Chrome and Microsoft Edge. ![]() There are different types of JS engines used by different browsers to analyse, parse and execute. JavaScript Interpreter: It is a unit used to parse and execute the JavaScript code in a web page.Networking: This unit handles HTTP calls and other network-related tasks.Gecko – Used in Mozilla Firefox browsers.Blink – Used in Google Chrome, Microsoft Edge, and Opera browsers.For example, if an HTML page is requested, then it is responsible for parsing HTML and CSS, and display the parsed and formatted content on the screen. Rendering Engine: It is the unit responsible for rendering/displaying the requested content on the browser window, which is one of the most expensive operations in the browser.It’s a middle man who sits between UI and Render Engine to connect those 2 parts. The browser engine is the part that receives the input from the UI and processes it to command the render engine. Browser Engine: This unit handles the interactions between the user interface and the rendering engine.The elements for interaction includes the address bar, the refresh, back, forward buttons, the bookmark bar, etc. It defines the layout of elements available for user to interact in the browser window except for the web page itself. User Interface: This unit includes things that are specific to each type of browsers and are not created by the web.The basic components of a browser are as follows: In this first part of the series, we're going to explore the overall structure of a browser. The purpose of this series is to help you understand what's going on under the hood of a browser and improve your understandings of the web. Our HTML docs likewise have some trivial and inconsequential HTML validation warnings due to our inclusion of a workaround for a certain Firefox bug.In this series, we are going to explore the components of a browser and go over the details of each component. These validation warnings don’t matter in practice since the non-hacky portion of our CSS does fully validate and the hacky portions don’t interfere with the proper functioning of the non-hacky portion, hence why we deliberately ignore these particular warnings. In a couple places, we also use bleeding-edge CSS features that aren’t yet fully standardized, but these are used purely for progressive enhancement. These hacks understandably cause CSS validators to complain that they are invalid. In order to provide the best possible experience to old and buggy browsers, CoreUI for Bootstrap uses CSS browser hacks in several places to target special CSS to certain browser versions in order to work around bugs in the browsers themselves. However, we tend to ignore these as they often have no direct solution other than hacky workarounds. Depending on the issue, we may be able to fix it (search first and then open an issue if need be). Page zooming inevitably presents rendering artifacts in some components, both in CoreUI for Bootstrap and the rest of the web. Thus, to close dropdowns in navbars, you must directly click the dropdown element (or any other element which will fire a click event in iOS). dropdown-backdrop element isn’t used on iOS in the nav because of the complexity of z-indexing. iOS text fields and scrollingĪs of iOS 9.2, while a modal is open, if the initial touch of a scroll gesture is within the boundary of a textual or a, the content underneath the modal will be scrolled instead of the modal itself. See Chrome bug #175502 (fixed in Chrome v40) and WebKit bug #153852. To that end, when you scroll past the top or bottom of a modal in either of those devices’ browsers, the content will begin to scroll. Support for overflow: hidden on the element is quite limited in iOS and Android. Modals and dropdowns on mobile Overflow and scrolling If you require Internet Explorer support, please use CoreUI v3. Unofficially, CoreUI for Bootstrap should look and behave well enough in Chromium and Chrome for Linux, and Firefox for Linux, though they are not officially supported. For Firefox, in addition to the latest normal stable release, we also support the latest Extended Support Release (ESR) version of Firefox. ![]()
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