It is used to flash partitions which are not real partitions, but are read-only files (file system images) mounted loopback.
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South Africa’s president, Cyril Ramaphosa, has called Donald Trump’s policy of allowing white Afrikaners to apply for refugee status in the US “racist”, saying the US president was “truly uninformed” in a rare instance of direct criticism.
Introduction to events: event propagation — MDN Web Docs