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<!DOCTYPE html>
<html>
<body>
​
<h2>With "use strict":</h2>
<h3>Deleting a variable (or object) is not allowed.</h3>
​
<p>Activate debugging in your browser (F12) to see the error report.</p>
​
<script>
"use strict";
var x = 3.14;
delete x;     // This will cause an error 
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_strict_delete by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 13:23:02 GMT -->
</html>
​
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