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Firefox 147 just landed & it's pretty huge in terms of web features: 🎉 CSS anchor positioning 🎉 The navigation API 🎉 View transition types 🎉 Brotli support in Compression/DecompressionStream 🎉 CSS module imports And more! https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/147

Can you try in nightly and let me know if it works there? If not, can you let me know the problem you're seeing?

Better on nighty, the position of the tooltip is good but not the tail. I am defining a margin-top on the element that should flip when the position change using flip-block (this part works fine). Then a pseudo element in inheriting that margin (this part is not working fine).

Here is another demo not working fine: css-tip.com/tooltip-anch... It has the same margin issue as the previous one but the position is not good in Nighty (it's good on the stable version). In Nighty the flip-start is not triggered (we get an overflow instead)