I'm a big fan of localForage. It handles the fallbacks on various devices. There's a few things it doesn't do super-well (multiple get/set operations in a batch

I'm a big fan of localForage. It handles the fallbacks on various devices. There's a few things it doesn't do super-well (multiple get/set operations in a batch, notably), but it's a great polyfill, especially if you don't want to mess around with the intricacies of indexedDB.