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<!DOCTYPE html>
<html>
<head>
<style>
a[target] {
    background-color: yellow;
}
</style>
</head>
<body>

<p>The CSS selector a[target] makes sure that all links with a target attribute gets a yellow background:</p>

<a href="../index.html">w3schools.com</a>
<a href="http://www.disney.com" target="_blank">disney.com</a>
<a href="http://www.wikipedia.org" target="_top">wikipedia.org</a>

<p>Click the button to add a red border to the first link that has a target attribute.</p>

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

<script>
function myFunction() {
    document.querySelector("a[target]").style.border = "10px solid red";
}
</script>

</body>
</html>