Sumada Kaabaha: localstorage
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LH Localforage
This plugin automatically and periodically saves the "just typed comment" so no data will be lost even if the browser crashes.
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Auto Save Progress for Gravity Forms
Automatically save Gravity Forms progress to browser localStorage. Recover user data if page is refreshed or closed.
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Savelo Form Autosave
Automatically saves form data to localStorage and restores it when the visitor returns. Zero server load. Works with any HTML form.