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<!DOCTYPE html>
<html>
<body>

<h1>A H1 element</h1>

<h2>A H2 element</h2>

<div>A DIV element</div>

<p>A p element.</p>

<p>A p element with a <span style="color:brown;">span</span> element inside.</p>

<p>Click the button to set the background color of all h2, div and span elements.</p>

<button onclick="myFunction()">Try it</button>

<p><strong>Note:</strong> The querySelectorAll() method is not supported in Internet Explorer 8 and earlier versions.</p>

<script>
function myFunction() {
    var x = document.querySelectorAll("h2, div, span");
    var i;
    for (i = 0; i < x.length; i++) {
        x[i].style.backgroundColor = "red";
    }
}
</script>

</body>
</html>