Resources for developers, by developers.

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• Faster Layouts with CSS Grid (and Subgrid!)

  CSS Grid has been available in most major browsers since early 2017, and it makes web layout more powerful than ever before. But complex-looking new syntax (line-names! grid-areas! minmax! fit-content! fr units!) and missing IE11 support can make it scary. Don’t let that stop you. Miriam Suzanne offers some basic ...

  Posted October 18, 2019 by Miriam Suzanne

• Developing cross-browser extensions with web-ext 3.2.0

  The web-ext tool was created at Mozilla to help you build browser extensions faster and more easily. Although our first launch focused on support for the desktop Firefox browser, followed by Firefox for Android, our vision was always to support cross-platform development once we shipped Firefox support. With the 3.2.0 ...

  Posted October 16, 2019 by Luca Greco

• Firefox’s New WebSocket Inspector

  The Firefox DevTools team and our contributors were hard at work over the summer, getting Firefox 70 jam-packed with improvements. We are especially excited about our new WebSocket inspection feature. To use the inspector now, download Firefox Developer Edition, and open the DevTools’ Network panel to find the Messages tab. ...

  Posted October 15, 2019 by Jan Honza Odvarko

• The Mozilla Developer Roadshow Talks: Firefox, WebAssembly, CSS, WebXR and More

  The Mozilla Developer Roadshow program launched in 2017 with the goal of bringing expert speakers and web technology updates to local communities through free events and partnerships. Check out the video playlist from our summer tour, with talks on topics like Mixed Reality, WebAssembly, modern CSS, and more. Or register ...

  Posted October 11, 2019 by Sandra Persing

• Why is CSS So Weird?

  CSS is the design language of the web — one of three core web languages — but it also seems to be the most contentious and often perplexing. It's too easy and too hard, too fragile and too resilient. Love it or hate it, CSS is weird: not quite markup, ...

  Posted October 03, 2019 by Miriam Suzanne