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If a user opens multiple instances of a web app in multiple tabs, any instance can be notified of changes to localStorage that any other instance makes by registering a storage event listener. A tab receiving such a notification might then react and e.g. update the UI according to the changes.
Indexed DB doesn't seem to offer a similarly convenient mechanism for such notifications. Would one have to use localStorage to "send" a notification to other tabs whenever making changes to Indexed DB? The only other alternative might be polling, which is clearly inferior to storage events.
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Data stored in indexedDB is available to all tabs from within the same origin.
Using localStorage requires creating many individual (in my case, dozens) key/value pairs. Instead, IndexedDB would allow storing an array or object of all form data together. This would make storage much easier and could potentially make retrieving the data much easier.
LocalStorage is slightly faster than IndexedDB in all browsers (disregarding the crashes). IndexedDB is not significantly slower when run in a web worker, and never blocks the DOM that way.
For instance, IndexedDB doesn't block the DOM when used with a worker, unlike localStorage. However, localStorage is slightly faster than IndexedDB.
There's no current "observer" API defined for Indexed DB. However, it's on the feature request list and there are similar proposals from both Mozilla and Google.
https://github.com/w3c/IndexedDB/issues/51
Which is to say: yes, you need to come up with some custom cross-tab communication mechanism, such as polling, storage events, setting up MessageChannel links (Chrome), BroadcastChannel (Firefox), or using a Service Worker as a relay between clients.
NEWS FLASH!
Chrome has an experimental Indexed DB Observers API. You need to run chrome with --enable-experimental-web-platform-features to use it so it's not useful in production yet. We'd love to get feedback on it - file bugs on the github repo.
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