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elinks/test/ecmascript/systemId.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<body>
<p>Click the button to display the doctype systemId of the document.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> In Internet Explorer 8 and earlier, the doctype property returns <em>null</em> for HTML and XHTML documents, and will only work for XML documents.</p>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.doctype.systemId;
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window.alert(x);
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}
</script>
</body>
</html>