How to change font-weight of a text using JavaScript ?

Last Updated : 25 Dec, 2020

In this article, we will set the font-weight of a text dynamically using JavaScript. Ti change the font weight dynamically, we use HTML DOM Style fontWeight property.

Syntax:

object.style.fontWeight = "value"

Property Values:

normal: The font weight is the default value.
lighter: The font weight is the lighter than normal.
bold: The font weight is bolder than normal.
bolder: The font weight is bolder than bold.
value: It defines from 100 to 900 where 400 is normal value.
initial: It sets to its default font weight.
inherit: It inherits this property from its parent element.

Example:

HTML

<!DOCTYPE html>
<html>

<head>
    <title>
        How to change font-weight of
        a text using JavaScript?
    </title>
</head>

<body style="text-align: center;">

    <h1 style="color: green">
        GeeksforGeeks
    </h1>

    <h2>
        How to change font-weight of
        <br>a text using JavaScript?
    </h2>

    <p id="sudo">Welcome to GeeksforGeeks</p>

    <br>

    <button type="button" onclick="myGeeks()">
        Click to change
    </button>

    <script>
        function myGeeks() {
            document.getElementById("sudo")
                .style.fontWeight = "bold";
        } 
    </script>
</body>

</html>