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[DFN[Secondary User Interface]] denotes the portions of a [[Web user agent]]'s  user interface that are available to the user after they are solicited by a specific user interaction.
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Examples of secondary user interface include the "Page Information" dialog commonly found in [[Web user agents]], and the "Security Properties" dialog that can obtained by clicking the padlock icon in common [[Web user agents]].

;;[CITE[Web Security Context: User Interface Guidelines]] ([TIME[2010-08-04 20:09:50 +09:00]] 版) <http://www.w3.org/TR/2010/REC-wsc-ui-20100812/#def-secondary-chrome>
