pub fn theme_select()Expand description
Wires up every [name=theme-select] <select> on the page: sets its
value to the resolved theme (see [prefers_color_scheme]), and
attaches a change listener that sets data-theme to the newly
selected value.
Calling this more than once (e.g. a rerun use_effect) is safe: a
control that’s already wired up is left alone rather than gaining a
duplicate listener.
§Panics
Panics if called outside a browser main-thread context (no window, or
no document on it).