CSSStyleDeclaration setProperty() Method

The setProperty() method is used to modify the existing CSS property or set the new CSS in the declaration block.

Syntax: It is used to return the length property.

object.setProperty(propertyname, value, priority)

Parameters: It accepts three parameters:

  • propertyname: It is a required parameter that contains a string which represents the name of the property to set.
  • value: It is an optional parameter that contains a string which represents the new value.
  • priority: It is an optional parameter that contains a string which represents if the priority of the property should be set to important or not.

Example: To show the working of the setProperty() method:





        body {
            text-align: center;
        h1 {
            color: green;
        #p1 {
            color: green;
            font-size: 20;
    <p id="p1">
      setProperty() Method
    <button onclick="myFunction()">
        Set property
    <p id="gfg"></p>
    <!-- Script to set the property -->
        function myFunction() {
            var x = 
            x.setProperty("background-color", "black");


Before clicking on the button:

After clicking on the button:

Supported Browsers:

  • Google Chrome
  • Internet Explorer 9.0
  • Firefox
  • Safari
  • Opera

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