"Chrome's announcement post demonstrates how, if we were using anchor positioning, we could use anchored container queries to query the currently active fallback position (if any). They've provided a little demo in the post where a toggletip caret is anchored to the side of a toggletip, but if the toggletip needs to be anchored to a different side of the trigger due to lack of space, the caret is anchored to a different side as well."
"In Chrome you'll see toggletip carets that flip to the appropriate side depending on the amount of space available, but in other web browsers you'll get the toggletips without carets. We'll be using popovers to mark up the toggletips, as that's the semantic way to do so these days, but before we begin it's worth mentioning that they're implicitly anchored."
Anchored container queries represent a new capability in Chrome 143 that extends existing container query options including size queries, style queries, and scroll-state queries. These queries allow developers to detect and respond to the currently active fallback position when using anchor positioning. A practical example demonstrates how toggletip carets can automatically flip to the appropriate side based on available space. The feature enables progressive enhancement where modern browsers display carets that adapt to positioning constraints, while other browsers show toggletips without carets. Implementation uses semantic HTML popovers with declarative anchor associations, combined with features like modern attr() and corner-shape for enhanced styling capabilities.
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