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localStorage is not a built-in source (or "channel") for hidden field AutoFill.
But you can use my advanced AutoFill code from here, which does include localStorage and sessionStorage (and is a little better in other ways than the native feature):
MktoForms2 :: KV HTML w/Auto-Fill and Cascade v1.1.2
You'll need the teknkl-formsplus-1.0.5.js file from the HTML pane, please download that and put it in your own Marketo Design Studio rather than pulling it from my CDN.
Then the JS pane shows how to AutoFill from a few different channels. The last example in the config is pulling from localStorage.
localStorage is not a built-in source (or "channel") for hidden field AutoFill.
But you can use my advanced AutoFill code from here, which does include localStorage and sessionStorage (and is a little better in other ways than the native feature):
MktoForms2 :: KV HTML w/Auto-Fill and Cascade v1.1.2
You'll need the teknkl-formsplus-1.0.5.js file from the HTML pane, please download that and put it in your own Marketo Design Studio rather than pulling it from my CDN.
Then the JS pane shows how to AutoFill from a few different channels. The last example in the config is pulling from localStorage.