MDN Web Docs
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
Overview
Added
March 18, 2026
Subject & domain
coding · web-development
Grade range
Grade 9 (Freshman)–Grade 12 (Senior)
Page kind
Article
Introduction
MDN Web Docs: 20th Anniversary and Platform Updates
- MDN 20th Anniversary: Celebrating two decades of the resource, its impact on the open web, and its evolution as a trusted developer tool.
- Navigation API: A modern successor to the History API and
window.location, specifically designed to manage navigation and history for single-page applications (SPAs). - Trusted Types API: A security feature that forces input through a transformation/sanitization function to prevent client-side cross-site scripting (XSS) attacks.
- CSS Anchor Positioning: A new module allowing developers to tether elements together, enabling positioned elements to dynamically bind to and align with anchor elements.
- MDN Frontend Rebuild: The site has undergone a major architectural overhaul; documentation is available regarding the technology stack and design decisions behind the update.
- Performance & UX:
- Image Compression: A technical series exploring the balance between quality, file size, and speed using various codecs and metrics.
- View Transitions: A guide on implementing smooth, animated transitions between pages in multi-page applications using CSS.
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