Press (and HOLD) a mouse button at an absolute viewport coordinate WITHOUT releasing it.
The "down" half of a manual drag: pairs with MouseUpAction (and any intervening
MouseMoveActions) to compose a click-drag — e.g. click-drag text selection in an input —
when the drag's endpoint isn't known up front (the streaming-human case). Use DragAction
instead when start and end are both known atomically.
Press (and HOLD) a mouse button at an absolute viewport coordinate WITHOUT releasing it.
The "down" half of a manual drag: pairs with MouseUpAction (and any intervening MouseMoveActions) to compose a click-drag — e.g. click-drag text selection in an input — when the drag's endpoint isn't known up front (the streaming-human case). Use DragAction instead when start and end are both known atomically.