Frontend & browser·Storage and platform APIs
the cached data disappeared on its own because the device was low on space.
Storage quota
Also calledeviction, storage pressure
The per-origin limit on how much a site may store, and the browser's right to evict it under pressure. Nothing in the browser is durable by default: quotas vary by device and available disk, and eviction happens without warning. `navigator.storage.persist()` asks for durability and may be refused, so any offline feature needs a path back to the server.