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<html><body><h1>HTML DOM Attributes</h1><h2>The isId Property</h2><p>Is the first attribute an id? The answer is:</p><p id="demo"></p><script>const element = document.getElementById("demo");const answer = element.attributes[0].isId;element.innerHTML = answer;</script><p>The isId property is no longer supported in any browsers.</p><p>The isId property always returns indefined.</p></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_attr_isid by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:39:46 GMT --></html>