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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript console.assert() Method</h1>
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<p>Press F12 on your keyboard to view the message in the console view.</p>
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<script>
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console.assert(document.getElementById("demo"), "You have no element with ID 'demo'");
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</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_console_assert by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:01:38 GMT -->
</html>
​
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