  We present the first study to explore the use of out-of-turn interaction in
websites. Out-of-turn interaction is a technique which empowers the user to
supply unsolicited information while browsing. This approach helps flexibly
bridge any mental mismatch between the user and the website, in a manner
fundamentally different from faceted browsing and site-specific search tools.
We built a user interface (Extempore) which accepts out-of-turn input via voice
or text; and employed it in a US congressional website, to determine if users
utilize out-of-turn interaction for information-finding tasks, and their
rationale for doing so. The results indicate that users are adept at discerning
when out-of-turn interaction is necessary in a particular task, and actively
interleaved it with browsing. However, users found cascading information across
information-finding subtasks challenging. Therefore, this work not only
improves our understanding of out-of-turn interaction, but also suggests
further opportunities to enrich browsing experiences for users.
