Drag div:
source: dragstart
target: dragenter
    types: text/plain
target: dragover
    types: text/plain
target: drop
    types: text/plain
    text/plain: 'hello'
    text/uri-list: ''
source: dragend:copy

Drag non-draggable div:
nodrag: mousedown
nodrag: mousemove
nodrag: mouseup

Drag link:
dragstart
    types: text/uri-list
target: dragenter
    types: text/uri-list
target: dragover
    types: text/uri-list
target: drop
    types: text/uri-list
    text/plain: ''
    text/uri-list: 'https://example.com/'

Drag image:
dragstart
    types: text/uri-list
target: dragenter
    types: text/uri-list
target: dragover
    types: text/uri-list
target: drop
    types: text/uri-list
    text/plain: ''
    text/uri-list: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR4nGP4z8DwHwAFAAH/iZk9HQAAAABJRU5ErkJggg=='

Dragstart cancelled:
source: dragstart
dragstart (cancelling)

Mousedown cancelled (prevents dragstart):
source: mousedown (cancelling)