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<html><head><style>.mystyle { width: 300px; height: 50px; text-align: center; background-color: coral; color: white; margin-bottom: 10px; float: left; margin: 8px;}</style></head><body><p>In this example, we search for the first div element in the document. Then, if the div element has an id of "myDIV" - change its font size.</p><button onclick="myFunction()">Try it</button><br><div id="myDIV" class="mystyle">I am a DIV element</div><div class="mystyle">I am also DIV element</div><script>function myFunction() { var x = document.getElementsByTagName("DIV")[0]; if (x.id === "myDIV") { x.style.fontSize = "30px"; }}</script></body></html>