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Every element defined as a query container has a container badge next to it in the Elements panel. The badge toggles a dotted-line overlay of the container and its descendants.
To find and select a container element that caused the query to take effect, hover over and click the element name above the @container declaration.
When hovered over, the name turns into a link to the element in the Elements panel and the Styles pane displays the queried property and its current value.