This page tests whether localStorage writes can be dropped during multiple write attempts from different browsing contexts.

The "test" is manually performed: quickly open this url in multiple windows. Initially, each window will write to a unique storage key. About 3 seconds later, the window will check to see if it's key is still present in localStorage.

The window background will turn red when the key is not found. Below are details of the test.

Key written to localStorage:

Key exists after delay:

This test was created in the context and purpose of creating Subetha, a localStorage-based networking library. See this thread on the failures of localStorage, for more information.