JavaScript – Change the Border Width of Paragraph

To change the border width of a paragraph using JavaScript, get the reference to the element, and assign the specific width value to the element.style.borderWidth property.

Example

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
</head> 
<body>
    <p id="myPara" style="border:2px solid green">Change the Border Width of Paragraph in JavaScript</p>
    <button type="button" onclick="changeStyle()">Click Me</button>
    <script>
        function changeStyle(){
            var element = document.getElementById("myPara");
            element.style.borderWidth = "5px";
        }
    </script>
</body>
</html>

Conclusion

In this JavaScript Tutorial, we learned how to change the border width of a paragraph using JavaScript.