It is possible – though not the default – set set keyboard focus on load to a control in an R Markdown web page rendered with Shiny.
Setting keyboard focus when an R Markdown page is loaded is beneficial to users, who can start interacting with the page without having to first click the control.
Click through to learn how. This is one of the biggest losses we have in the GUI era: that you have a mouse necessitates using the mouse for everything. But that’s a “get off my lawn” rant for another day.