This article provides information about the changes in Firefox 145 that affect developers. Firefox 145 was released on November 11, 2025.

Présentation effectuée au capitole du libre 2025 par Christophe Villeneuve sur "Contribuer à la traduction De ________ vers le français". Cette session…

Thanks for taking our survey about the usage of web platform security features. We're the W3C Security Web Application Guidelines Community Group (SWAG CG), and our mission is to develop guidelines for the usage of web platform security features, to help web developers secure their sites. We're trying to understand whether developers are using specific web platform security features, and what the barriers are to the adoption of these features. The survey itself is in three parts: 1. About you: this section asks some questions about you and your level of experience of both general web development technology and web security technology in particular. This helps us understand how different individuals have different perspectives on web security, and helps us design guidelines to help as many developers as possible. 2. Web security features: this asks some questions about your usage of some specific web platform security features. 3. Web security interview: this asks if you would be

The Temporal object enables date and time management in various scenarios, including built-in time zone and calendar representation, wall-clock time conversions, arithmetics, formatting, and more. It is designed as a full replacement for the Date object.

The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.

Image compression involves countless trade-offs between quality, size, and speed. In this final part of the series, we experiment with codecs, metrics, and tools to find practical ways to balance efficiency and visual fidelity.

Image compression involves countless trade-offs between quality, size, and speed. In this final part of the series, we experiment with codecs, metrics, and tools to find practical ways to balance efficiency and visual fidelity.

This article provides information about the changes in Firefox 145 that affect developers. Firefox 145 was released on November 11, 2025.

Thanks for taking our survey about the usage of web platform security features. We're the W3C Security Web Application Guidelines Community Group (SWAG CG), and our mission is to develop guidelines for the usage of web platform security features, to help web developers secure their sites. We're trying to understand whether developers are using specific web platform security features, and what the barriers are to the adoption of these features. The survey itself is in three parts: 1. About you: this section asks some questions about you and your level of experience of both general web development technology and web security technology in particular. This helps us understand how different individuals have different perspectives on web security, and helps us design guidelines to help as many developers as possible. 2. Web security features: this asks some questions about your usage of some specific web platform security features. 3. Web security interview: this asks if you would be

This article provides information about the changes in Firefox 145 that affect developers. Firefox 145 was released on November 11, 2025.

Prototype pollution is a vulnerability where an attacker can add or modify properties on an object's prototype. This means malicious values can unexpectedly appear on objects in your application, often leading to logic errors or additional attacks like cross-site scripting (XSS).

Image compression involves countless trade-offs between quality, size, and speed. In this final part of the series, we experiment with codecs, metrics, and tools to find practical ways to balance efficiency and visual fidelity.

This article provides information about the changes in Firefox 145 that affect developers. Firefox 145 was released on November 11, 2025.

A software supply chain consists of all the software and tools used to create and maintain a software product. This includes not only the software developed for the product itself but all the software and tools used in its production.

Learn how to bring smooth, animated navigation to multi-page apps with view transitions. With just one line of CSS, you can enable seamless transitions between pages.

Browsers are starting to roll out changes in default UA styles for nested section headings. This post describes the incoming changes, how to identify if it's an issue on your websites, and hints for conformant and better-structured pages.

The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.

The aim of this skill test is to help you assess whether you understand the CSS box model.

A software supply chain consists of all the software and tools used to create and maintain a software product. This includes not only the software developed for the product itself but all the software and tools used in its production.

Learn how to bring smooth, animated navigation to multi-page apps with view transitions. With just one line of CSS, you can enable seamless transitions between pages.