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25 lines
671 B
HTML
25 lines
671 B
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<body>
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<p>Click the button to display the doctype systemId of the document.</p>
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<button onclick="myFunction()">Try it</button>
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<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>
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<p id="demo"></p>
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<script>
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function myFunction() {
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var x = document.doctype.systemId;
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console.assert(x === 'http://www.w3.org/TR/html4/strict.dtd', 'systemId');
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}
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console.error("doctype.systemId.html");
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myFunction();
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console.exit();
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</script>
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</body>
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</html>
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