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HTML

<h1>Obscure JavaScript</h1>
My email is <strong id="secret1"></strong>

JavaScript

var parts = ["secret", "my", 64, "il.com", "gma"];

document.getElementById("secret1").textContent = 
    parts[1] + parts[0] // my + secret
    + String.fromCharCode(parts[2])  // @
    + parts[4] + parts[3]; // gma + il.com