drag & drop - cancelling dragging text onto a file input

1. Save this file to your computer.
2. Write the full /path/and/name to that file, into the first input below, then select all of the text you just entered.
3. Drag selected text to the file input. If no prompt appears, and the text is not added to the file input, pass and ignore further steps.
4. If a prompt appears, refuse it. Fail if the file input's value is set without any prompts.
5. If a prompt appears; fail if the file input's value is set after refusing the prompt.