Javascript DOM HTML Element querySelector() Method by tag name and attribute name

Introduction

Add a red border to the first <a> element that has a target attribute inside a <div> element:

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

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<!DOCTYPE html>
<html>
<head>
<style>
a[target] {/*from  w ww .  j  a va  2s  .  co m*/
  background-color: yellow;
}

#myDIV {
  border: 1px solid black;
}
</style>
</head>
<body>


<div id="myDIV">
  Three links inside div:
  <a href="https://www.java2s.com">java2s.com</a>
  <a href="http://www.disney.com" target="_blank">disney.com</a>
  <a href="http://www.wikipedia.org" target="_top">wikipedia.org</a>
</div>
<button onclick="myFunction()">Test</button>
<script>
function myFunction() {
  var x = document.getElementById("myDIV");
  x.querySelector("a[target]").style.border = "10px solid red";
}
</script>

</body>
</html>



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