HTML DOM window devicePixelRatio property

Last Updated : 12 Jul, 2022

The devicePixelRatio property returns the ratio of the resolution in physical pixels to the resolution in CSS pixels for the current device. In simpler terms, this property also tells the browser how many of the screen’s actual pixels should be used to draw a single CSS pixel. This is a read-only property.

Syntax:

value = window.devicePixelRatio;

Return Value: returns a double-precision floating-point value indicating the ratio of the display’s resolution in physical pixels to the resolution in CSS pixels.

Example: In this example, we will get the ratio using this property.

html

<!DOCTYPE HTML> 
<html>  
<head>
    <title>window devicePixelRatio property</title>
</head>   
<body style="text-align:center;">
    <h1 style="color:green;">  
        GeeksforGeeks  
    </h1> 
    <p> 
    HTML | window devicePixelRatio property
    </p>
    <button onclick = "Geeks()">
    Click Here
    </button>
    <p id="a"> 
    </p>       
    <script> 
        var a = document.getElementById("a");
        function Geeks() {
        a.innerHTML="devicePixelRatio is :
               "+window.devicePixelRatio; 
        } 
    </script> 
</body>   
</html>