FF149 MDN work for this can be tracked in https://github.com/mdn/content/issues/43212
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FF149 MDN work for this can be tracked in https://github.com/mdn/content/issues/43212 Does this reflect a recent spec change? I'm trying this on browserstack and the https://wpt.live/css/css-conditional/container-queries/query-container-name.html test fails on the most recent versions of all browsers they have. Looking at https://wpt.fyi/results/css/css-conditional/container-queries/query-container-name.html?label=master&label=experimental&aligned the versions are more recent, so it could be simply I don't have the right versions to test. Note, it does work locally on nightly. The reason I ask is that I presume I will need to update the compatibility data, and it is useful to know when each browser updated.