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When I was navigating to a question and entering comments, I incorrectly pressed some key near the Enter key and the question I was commenting in gets highlighted. When I inspect element the highlighted element block, I noticed the keyboard-selected class added to the question class div element. What is the use of the option and using which key I can make the div highlight like this,

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You pressed the U key, as can be seen in the keyboard shortcuts help screen: (by pressing ?)

This is useful for cases where you select some answer (by pressing J or K), and want to select the question again. All actions (vote, edit, comment, etc) are done on the selected post, or the question if no post is selected.

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