HTML DOM querySelector() Method

HTMLWeb DevelopmentFront End Technology

The HTML DOM querySelector() method returns the first element that matches a specific CSS selector specified in its parameter in an HTML document.

Syntax

Following is the syntax −

document.querySelector(“CSS Selector”);

Example

Let us see an example of querySelector() method −

 Live Demo

<!DOCTYPE html>
<html>
<head>
<style>
   html{
      height:100%;
   }
   body{
      text-align:center;
      color:#fff;
      background: linear-gradient(62deg, #FBAB7E 0%, #F7CE68 100%) center/cover no-repeat;
      height:100%;
   }
   .drop-down{
      width:35%;
      border:2px solid #fff;
      font-weight:bold;
      padding:8px;
   }
   .btn{
      background:#0197F6;
      border:none;
      height:2rem;
      border-radius:2px;
      width:35%;
      margin:2rem auto;
      display:block;
      color:#fff;
      outline:none;
      cursor:pointer;
   }
   .show{
      font-size:1.5rem;
      font-weight:bold;
   }
</style>
</head>
<body>
<h1>DOM querySelector() Method Demo</h1>
<p class="awesome-para">Hi! I'm a paragraph with some random text.</p>
<button onclick="changeColor()" class="btn">Change p styles</button>
<script>
   function changeColor() {
      var paraElement = document.querySelector(".awesome-para");
      paraElement.style.color="#db133a";
      paraElement.style.fontSize="1.2rem";
   }
</script>
</body>
</html>

Output

This will produce the following output −

Click on “blue” button to change the styles of para element.

raja
Published on 19-Jul-2019 13:35:21
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