Attempts to delete the named database. If the database already exists and there are open connections that don't close in response to a versionchange event, the request will be blocked until all they close. If the request is successful request's result will be null.
Attempts to open a connection to the named database with the specified version. If the database already exists with a lower version and there are open connections that don't close in response to a versionchange event, the request will be blocked until all they close, then an upgrade will occur. If the database already exists with a higher version the request will fail. If the request is successful request's result will be the connection.
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Compares two values as keys. Returns -1 if key1 precedes key2, 1 if key2 precedes key1, and 0 if the keys are equal. Throws a "DataError" DOMException if either input is not a valid key.