Open Web Docs

In 2025, we systematically collected compat data for 28 browser releases:

Firefox 135 - 147
Chrome 133 - 144
Safari 18.4, 26, 26.2

We're keeping your compat tables up-to-date.

Supply chain attacks - Security | MDN 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.

🧩 Your supply chain is only as strong as its weakest dependency.

From securing build tools to verifying external scripts, this new MDN guide by @openwebdocs.org walks you through steps to protect your projects from supply chain attacks.

Read the guide 👇
developer.mozilla.org/en-US/docs/...

JavaScript prototype pollution - Security | MDN 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, ofte...

We've written a new guide on JavaScript Prototype Pollution and how to defend against it.

developer.mozilla.org/en-US/docs/W...

Many thanks to @joshcena.com , Aaron Shim, and Maurice Dauer for your help and feedback! #websecurity

Supply chain attacks - Security | MDN 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...

We've written a new guide on Supply Chain Attacks:

developer.mozilla.org/en-US/docs/W...

Many thanks to the W3C SWAG CG and @jordan.har.band for the reviews and feedback! #websecurity

Sovereign Tech Fund invests in Web Security and Privacy docs Open Web Docs supports web platform documentation for the benefit of web developers & designers worldwide. We are a community of web developers, standards makers, and technology companies that rely on...

We're happy to share that @sovereign.tech invests in Web Security and Privacy Documentation!

Over the coming year, Open Web Docs will be working on creating and updating Security and Privacy docs for web developers on @developer.mozilla.org.

Full announcement: openwebdocs.org/content/post...

Thank you Dave! 💜

Every month I support:
@lolaslab.bsky.social
@openwebdocs.org
@11ty.dev
@piccalil.li
Because they all do great things for the web and make it a better place to work.
You should consider helping out too, especially @lolaodelola.bsky.social

Open Web Docs do extremely important work in maintaining open source web documentation and data sets, if you’re a web developer you’ve likely used a resource they maintain.

Patrick - How to convince your boss to sponsor Open Web Docs A blog post by Patrick Brosset: How to convince your boss to sponsor Open Web Docs

Does your organization rely on MDN for reference docs?
Do you often check browser compat on MDN or caniuse.com?
Do you use tools like browser DevTools or VSCode in your work?

If so, you rely directly on the work that Open Web Docs does and should consider sponsoring.

To convince your boss.

A title card with the open web docs logo, colorful sound waves emanate from it. The card says "All about open web docs, featuring Estelle Weyl and Will Bamberg"

🎙️New Episode of Igalia Chats: All About Open Web Docs

@meyerweb.com and @bkardell.com chat with @estelle.bsky.social & Will Bamberg of @openwebdocs.org

www.igalia.com/chats/owd

Launching the W3C Docs Community Group Open Web Docs supports web platform documentation for the benefit of web developers & designers worldwide. We are a community of web developers, standards makers, and technology companies that rely on...

Launching the W3C Docs Community Group

openwebdocs.org/content/post...

Thank you @igalia.com for renewing your Open Web Docs membership and sponsoring us again in 2025! 💜

Igalia has been sponsoring OWD for the 5th time already! Sustainable funding allows us to maintain documentation in the long-term.

Featured posts this week:
⚡ New tools for a better UX: @catchpointsystems.bsky.social
⚡ Bloomberg Backs Open Web Docs: @bloomberglp.bsky.social & @openwebdocs.org
⚡ Why Do Tech #SEO and #WebPerf Matter: @techseovitals.com
⚡ Web Perf Guide: @developer.mozilla.org
Special thanks to the authors.🙏

Sponsor @openwebdocs on GitHub Sponsors Open Web Docs is a community of web developers, standards makers, and technology companies that considers web platform documentation to be critical digital infrastructure, and we work cooperatively...

Thank you @dotmh.dev for becoming a monthly OWD supporter on our GitHub Sponsors! 💜 github.com/sponsors/ope...

Bloomberg Backs Open Web Docs to Support High-Quality Web Platform Documentation for All | Bloomberg As a sponsor of Open Web Docs, Bloomberg helps ensure documentation for web platform technologies remains comprehensive, updated & freely available to all.

Bloomberg is now sponsoring @openwebdocs.org ! www.bloomberg.com/company/stor...

Bloomberg Backs Open Web Docs to Support High-Quality Web Platform Documentation for All | Bloomberg As a sponsor of Open Web Docs, Bloomberg helps ensure documentation for web platform technologies remains comprehensive, updated & freely available to all.

Bloomberg Backs Open Web Docs to Support High-Quality Web Platform Documentation for All

www.bloomberg.com/company/stor...

Bloomberg Joins Open Web Docs Open Web Docs supports web platform documentation for the benefit of web developers & designers worldwide. We are a community of web developers, standards makers, and technology companies that rely on...

We're happy to announce that Bloomberg joins Open Web Docs!

openwebdocs.org/content/post...

(BCD is critical infrastructure for the web - used in all kinds of tools and open source projects and by loads of businesses. donate to @openwebdocs.org to support this key resource.)

screenshot of a diagram showing the number of new "keys" (basically apis or components of apis) added to the web per year from 1996 thru 2025, showing a generally upward trend, and with a pointer to 2017 being a banner year for new apis added.

visualizing the surface-area growth rate of the web platform

based on Browser Compat Data (BCD) data set from @openwebdocs.org.

not be 100% correct yet, but the gist is right.

need to clean it up then will post the source generator + data.

Let’s make some docs together! Our #FOSDEM kicks off in the Tool the Docs room with @ddbeck.com!

Open Web Docs Impact and Transparency Report 2024 Open Web Docs supports web platform documentation for the benefit of web developers & designers worldwide. We are a community of web developers, standards makers, and technology companies that rely on...

Amazing, hard-working, kind people who truly care about the open web!! 😍 @openwebdocs.org - Impact and Transparency Report 2024

openwebdocs.org/content/repo...

We consider web platform docs critical digital infrastructure and we're planning for more in 2025!

Thanks to everyone who has been part of our journey in 2024! Join us on our mission and become an OWD sponsoring organization in 2025!

In 2024, we identified missing reference pages for widely available features and created ~600 new pages on MDN Web Docs to fill this gap.

We also continued to play an essential maintainer role by reviewing pull requests for mdn/content and mdn/browser-compat-data.

In 2024, we joined the W3C Security Web Application Guidelines Community Group (SWAG CG).

We created and rewrote docs about XSS and CSP and will continue this work in 2025 to make sure we promote security best practices and help developers understand security threats and their mitigations.

In 2024, we cataloged web platform features, became a maintainer of the W3C WebDX github.com/web-platform... project, and made sure it syncs up nicely with browser-compat-data.

In 2024, thanks to an investment from @sovereign.tech, we systematically collected compatibility data for 30 browser releases throughout the entire year. As a result, whenever browsers shipped new features, the data was already available on @mozdevnet.bsky.social, caniuse.com, and other projects.

Open Web Docs Impact and Transparency Report 2024 Open Web Docs supports web platform documentation for the benefit of web developers & designers worldwide. We are a community of web developers, standards makers, and technology companies that rely on...

Open Web Docs 2024 Report

We're reflecting on our fourth year of ensuring the long-term health of web platform documentation

openwebdocs.org/content/repo...

Find us at #FOSDEM 2025 this weekend! @florianscholz.com and @torgo.com will be in Brussels and are happy to chat about OWD!

Saturday: Tool the Docs room: fosdem.org/2025/schedul...

Sunday: Funding the FOSS Ecosystem room: fosdem.org/2025/schedul...

Cross-site scripting (XSS) - Security on the web | MDN A cross-site scripting (XSS) attack is one in which an attacker is able to get a target site to execute malicious code as though it was part of the website.

Learn about XSS for XMAS!

We created a new MDN page about Cross-site scripting: developer.mozilla.org/en-US/docs/W...