Transfer — Clipboard & File drop / select

① Page → clipboard write

Page code copies a secret. Stub should intercept as cb-writeText / cb-write.

② Page → clipboard read

Copy something first, then trigger. Stub intercepts as cb-readText / cb-read.

③ User copy / cut · pastejack

Select text below and Ctrl+C / Ctrl+X → copy-event / cut-event
Pastejack: replaces clipboard on every copy via DataTransfer.setData. Expect both copy-event (real selection) and dt-setData (injected secret) in log.

④ Paste

Ctrl+V here — text or files → paste-event

⑤ File select

Select one or more files → file-input. Non-text files are filtered by content script.

⑥ Drop

Drop files or selected text from another window → drop

Drop files or text here

Event log

No events yet

stub MAIN-world hook → postMessage → visible here dom DOM event mirror · content script also captures → background