Mar 22, 2025 · The CSSStyleDeclaration.setProperty() method interface sets a new value for a property on a CSS style declaration object.

The setProperty() method sets a new or modifies an existing CSS property in a CSS declaration block.

Mar 4, 2011 · You can assign a CSS custom property to your element (through CSS or JS) and change it: Assigment through CSS: element { --element-width: 300px; width: var(--element-width, 100%); }

In JavaScript, all attributes can be read, but only the value attribute can be changed (and only if the property is writable). ( ECMAScript 5 has methods for both getting and setting all property attributes)

Set a style property: The value of the specified property. The element's CSSStyleDeclaration object. element.style is a DOM Level 2 (2001) feature. It is fully supported in all browsers:

Mar 6, 2013 · Consider the following example: If you want to change a single CSS property(say, color to 'blue'), then the below statement works fine. document.getElementById("ele_id").style.color="blue"; But, for changing multiple properies the more robust way is using Object.assign() or, object spread operator {...}

Jul 14, 2022 · 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:

Aug 3, 2023 · Given an HTML document and the task is to change the style properties (CSS Properties) of an element dynamically with the help of JavaScript. The element.style property is represented by the CSSStyleDeclaration object, which is returned via the style property. Select the element whose style properties need to be changed.

Jul 20, 2023 · To set the value of a CSS variable with JavaScript, you can use the setProperty() method on the element’s style property. The setProperty() method takes two parameters, the name of the CSS variable and its value, both as strings, and applies them to the given element.

Aug 10, 2018 · Ben Nadel showcases the style.setProperty() method in JavaScript. This allows you to update CSS styles; but, unlike mutating the style object directly, the .setProperty() method allows you to keep your CSS names consistent in both CSS and JavaScript.