Last Saturday, I attended the first Frontend.mu meetup of 2025. One of the featured presentations was on “Browser Origins,” delivered by Sandeep. The talk was very interesting, and I’d like to share what I learned from it. You can find Sandeep’s presentation here.
The Early Days
The first web browser was created by Sir Tim Berners-Lee in 1990, called “WorldWideWeb” as part of his effort to develop the World Wide Web. It was later renamed Nexus to avoid confusion with the broader concept of the web. Nexus allowed users to view and edit web pages,serving as both a browser an d an editor. It was developer for the NeXT computer system and laid the groundwork for all future browser.
Furthermore, Tim Berners-Lee founded the World Wide Web Consortium (W3C) in 1994 to promote Web standards to ensure interoperability across different browser and platform.
The Rise of Netscape and First Browser War
In 1994, Netscape Navigator emerged as the second major browser, created by Marc Andreesen. Netscape introduced many features that are now standard, such as support for images, JavaScript, and cookies. However, its dominance was challenged by Microsoft’s Internet Explorer (IE), which was bundled with the Windows Operating system, giving it an unfair advantage over Netscape. This resulted in a sharp decline in Netscape’s market share, and by the early 2000s, Internet Explorer dominated the web with over 90% market share. This period was characterized by rapid innovation but also by the introduction of proprietary features that fragmented web standards.
Also this had led to the famous Microsoft Corperation’s Antitrust Case where one of the allegations is that Microsoft illegally tried to monopolized Internet browsers market.
JavaScript vs JScript
JavaScript, created by Brendan Eich in 1995, was initially developed for Netscape Navigator to add interactivity to web pages. It was originally called LiveScript before being renamed JavaScript as a marketing strategy to capitalize on Java’s popularity. Microsoft later created its own version called JScript for Internet Explorer, which led to compatibility issues between browsers due to differences in implementation, leading to widespread use of “best viewed in Netscape” and “best viewed in Internet Explorer” logos for several years.
To standardize the language, ECMAScript was introduced as a specification by Ecma International in 1997. ECMAScript serves as the foundation for JavaScript, ensuring consistency across browsers and enabling new features like arrow functions, async/await, and modules.
Firefox and the Open Web
Mozilla Firefox was released in 2004 as a free and open-source browser, built from the remnants of Netscape’s codebase. Firefox introduced groundbreaking innovations like tabbed browsing, a robust extension ecosystem, and a strong focus on user privacy and web standards. These features, combined with its extensibility through add-ons, helped Firefox gradually gain market share and challenge IE’s monopoly.
Google Chrome and the Second Browser War
In 2008, Google Chrome was released, featuring a minimalist design, a powerful JavaScript engine called V8, and a multi-process architecture that improved performance and security. Chrome’s speed and simplicity led to rapid adoption, igniting the second browser war. Competing browsers like Firefox, Safari, and Edge struggled to keep up, and by the mid-2010s, Chrome became the dominant browser worldwide.
Web Engines: The Technical Core
At the core of every modern browser is a web engine, responsible for parsing and rendering web content. The major engines include:
- Blink: Developed by Google (forked from WebKit), powers Chrome, Edge, Opera, and many others. It has become the most widely used engine.
- Gecko: Mozilla’s engine for Firefox, focuses on standards compliance and performance.
- WebKit: Originally developed by Apple, powers Safari and was the foundation for Blink.
- Trident/EdgeHTML: Microsoft’s legacy engines (now discontinued in favor of Blink).
These engines differ in how they handle rendering, JavaScript execution, and support for emerging web standards. For example, Blink and WebKit share a common ancestry but have diverged in their implementation of features like CSS grid and JavaScript APIs. Gecko, on the other hand, has a distinct architecture that prioritizes extensibility and adherence to open standards.
Baseline and Interop: Measuring Web Compatibility
The Web Platform Status project and Interop are initiatives aimed at improving cross-browser compatibility and ensuring consistent implementation of web standards. Baseline is a concept introduced to define a set of web features that are universally supported across all major browsers. This helps developers build websites that work reliably without needing polyfills or workarounds.
Interop, on the other hand, focuses on identifying and resolving inconsistencies in how browsers implement web standards. By running a vast suite of tests through the Web Platform Tests (WPT), Interop provides a detailed breakdown of browser compatibility, encouraging vendors to address gaps and improve interoperability.
The Future of Browsers
The browser landscape continues to evolve, with new players challenging the status quo.
- Arc Browser is a modern browser designed for productivity, featuring a unique sidebar interface and advanced organizational tools.
- Ladybird, a browser being developed by the SerenityOS project, aims to create a fully independent engine from scratch, free from the constraints of existing engines.
- Zen Browser focuses on minimalism and privacy, offering a distraction-free browsing experience.