Thanks for pointing it out, Maire. I'll update the page.
Bug 1422312 Comment 11 Edit History
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Thanks for pointing it out, Maire. I'll update the page. Update: Sorry, I was a bit hasty in my previous response. That status as Experimental on the page is correct. The reason why it is marked experimental is because it is not supported on any other major browser. You can see from the [Browser compatibility table](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/update-frequency#browser_compatibility) that it is only supported in Firefox. And thats why it gets marked as "[Experimental](https://developer.mozilla.org/en-US/docs/MDN/Writing_guidelines/Experimental_deprecated_obsolete#experimental)" on MDN.
Thanks for pointing it out, Maire. I'll update the page. Update: Sorry, I was a bit hasty in my previous response. That status as Experimental on the page is correct. The reason why it is marked experimental is because it is not supported on any other major browser. You can see from the [Browser compatibility table](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/update-frequency#browser_compatibility) that it is only supported in Firefox. And thats why it gets marked as "[Experimental](https://developer.mozilla.org/en-US/docs/MDN/Writing_guidelines/Experimental_deprecated_obsolete#experimental)" on MDN