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<!DOCTYPE html>
<html>
<body>
<h1>The Console Object</h1>
<h2>The assert() Method</h2>
<p>Remember to open the console (Press F12) before you click "Run".</p>
<script>
let x = 5;
let y = 5;
console.assert(x + y == 11, "Expression returned 'false'");
</script>
</body>
</html>