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Firefox for Web Developers

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Official Firefox account for people who build on the web. Learn about the things we're working on to grow and improve the web platform.

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We're experimenting with a way to visualize session history in Firefox DevTools, and we'd love your feedback! Here's the background, and how to try it:

We're experimenting with a way to visualize session history in Firefox DevTools, and we'd love your feedback! Here's the background, and how to try it:

20,124 Aufrufe

AI Controls (formally 'kill switch') are landing in today's Firefox Nightly, and will land with Firefox 148 later this month.

AI Controls (formally 'kill switch') are landing in today's Firefox Nightly, and will land with Firefox 148 later this month.

38,505 Aufrufe

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Can you tell CSS from BS? Can you beat my score?

Can you tell CSS from BS? Can you beat my score?

Firefox for Web Developers

37,050 Aufrufe • vor 2 Monaten

sizes="auto" landed in Firefox 150, making responsive images simpler and more reliable. Here's when you can use it, and how…

sizes="auto" landed in Firefox 150, making responsive images simpler and more reliable. Here's when you can use it, and how…

Firefox for Web Developers

21,903 Aufrufe • vor 1 Monat

CSS's light-dark() now accepts images, making it simpler to define alternate values for a dark color scheme. Here's how it works:

CSS's light-dark() now accepts images, making it simpler to define alternate values for a dark color scheme. Here's how it works:

Firefox for Web Developers

19,475 Aufrufe • vor 1 Monat

CSS contrast-color is newly baseline, but it falls short in some areas. Here's how it works, and what to look out for:

CSS contrast-color is newly baseline, but it falls short in some areas. Here's how it works, and what to look out for:

Firefox for Web Developers

16,999 Aufrufe • vor 1 Monat

HTML invoker commands are newly baseline! Here's how they work…

HTML invoker commands are newly baseline! Here's how they work…

Firefox for Web Developers

30,612 Aufrufe • vor 5 Monaten

JavaScript declarations in conditionals was discussed at TC39 recently, but consensus broke down over one key detail. How do you think it should behave?

JavaScript declarations in conditionals was discussed at TC39 recently, but consensus broke down over one key detail. How do you think it should behave?

Firefox for Web Developers

30,662 Aufrufe • vor 5 Monaten

Out-of-order HTML patching, another proposal from TPAC, lets HTML be presented non-linearly, and a single file can update multiple parts of the page. Would this feature be useful to you?

Out-of-order HTML patching, another proposal from TPAC, lets HTML be presented non-linearly, and a single file can update multiple parts of the page. Would this feature be useful to you?

Firefox for Web Developers

28,757 Aufrufe • vor 6 Monaten

We have Custom Elements, but do we also need Custom Attributes? This was discussed at TPAC. Is it something you'd like on the platform?

We have Custom Elements, but do we also need Custom Attributes? This was discussed at TPAC. Is it something you'd like on the platform?

Firefox for Web Developers

23,749 Aufrufe • vor 6 Monaten

JavaScript Iterator․zip landed in Firefox 148, making it simple to loop over multiple things at the same time. Here's how it works:

JavaScript Iterator․zip landed in Firefox 148, making it simple to loop over multiple things at the same time. Here's how it works:

Firefox for Web Developers

11,958 Aufrufe • vor 3 Monaten

View Transition Types are newly baseline! These make it easier to build transitions that are specific to particular situations. Also, we have some new View Transition DevTools in Firefox 147…

View Transition Types are newly baseline! These make it easier to build transitions that are specific to particular situations. Also, we have some new View Transition DevTools in Firefox 147…

Firefox for Web Developers

15,394 Aufrufe • vor 4 Monaten

CSS shape() landed in Firefox 148. It's similar to path(), but allows the full expressiveness of CSS…

CSS shape() landed in Firefox 148. It's similar to path(), but allows the full expressiveness of CSS…

Firefox for Web Developers

11,137 Aufrufe • vor 3 Monaten

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