Adding the associated forum release post for v1.13 since it’s one of the top results.
From the release post:
window.dash_clientside.callback_context
window.dash_clientside.callback_context.triggered
window.dash_clientside.callback_context.inputs
window.dash_clientside.callback_context.inputs_list
window.dash_clientside.callback_context.states
window.dash_clientside.callback_context.states_list