The DOM style opacity property returns and modify the value of opacity CSS property of an element in an HTML document.
Following is the syntax −
1. Returning opacity
object.style.opacity
Modifying opacity
object.style.opacity = “value”
Let us see an example of style opacity property −
<!DOCTYPE html> <html> <head> <style> body { color: #000; background: lightblue; height: 100vh; } p { background: #1f13db; height: 50px; width: 100%; } .btn { background: #db133a; border: none; height: 2rem; border-radius: 2px; width: 40%; display: block; color: #fff; outline: none; cursor: pointer; } </style> </head> <body> <h1>DOM Style opacity Property Example</h1> <p></p> <button onclick="add()" class="btn">Add opacity</button> <script> function add() { document.querySelector('p').style.opacity = "0.2"; } </script> </body> </html>
This will produce the following output −
Click on “Add opacity” button to add opacity property −