Some public stuff
API https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/movementX
Draggable square div https://svelte.dev/repl/c10629261a764ae4a5c11e70ed19c5c4?version=3.29.7
DragDrop List Svelte https://github.com/jwlarocque/svelte-dragdroplist/blob/master/DragDropList.svelte
add missing clientX in that lib