.mouseButtonDown() Suggest edits
Click and hold the left mouse button (at the coordinates set by the last
moveTo command). Note that the next mouse-related command that should follow is
mouseButtonUp . Any other mouse command (such as click or another call to buttondown) will yield undefined behaviour.
Can be used for implementing drag-and-drop. The button can be (0, 1, 2) or ('left', 'middle', 'right'). It defaults to left mouse button, and if you don't pass in a button but do pass in a callback, it will handle it correctly.
Since v2.0, this command is deprecated. It is only available on older JSONWire-based drivers. Please use the new User Actions API.
The mouse button
Optional callback function to be called when the command finishes.