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// Cookies: sent with every request to the server document.cookie = "sessionId=abc; Secure; HttpOnly; SameSite=Strict"; // localStorage: client-side only, never sent to server localStorage.setItem("theme", "dark"); // Key differences: // Cookies: 4KB limit, server access, expiry dates // localStorage: 5MB limit, JS-only, no expiry // sessionStorage: 5MB limit, JS-only, per-tab
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