Basic Autosaving

Basic 

// Basic
new SimpleMDE({
    element: document.getElementById("demo1"),
    spellChecker: false,
});

Autosaving 

// Autosaving
new SimpleMDE({
    element: document.getElementById("demo2"),
    spellChecker: false,
    autosave: {
        enabled: true,
        unique_id: "demo2",
    },
});