Define a checkbox by its label, its value, and optionally a CSS class.
checkbox(label, value, class = "")A named list, to be used in reactCheckboxesInput.
the label of the checkbox, can be an ordinary character string,
a html character string made with the HTML
function, or a shiny.tag object
the initial value of the checkbox, TRUE (checked), or
FALSE (unchecked)
the name of a CSS class to attach to the checkbox, that should
be defined with checkboxStyle