Spec mostly doesn't mention blob expectations

[evanstade]

We expect that blob handle can outlive the records and databases they are (were) stored in, but that's not mentioned anywhere in the spec.

This Chromium implementation doc may be helpful.

This does already have WPT coverage.

[mkruisselbrink]

This is something I've been meaning to address from the FileAPI side as well (which currently more or less pretends that a Blob is an immutable bunch of bytes, and as such will always remain valid after it has been created). Without actually making things more rigorous on that side, probably specifying what the "snapshot state" of a IndexedDB backed blob is is the best you can do (similar to how it's kind of hand-wavy described for file backed blobs)