JavaScript windows getComputedStyle() Method

The window.getComputedStyle() method in JavaScript is used to retrieve the computed style properties of an element. It returns an object that represents the final computed values of all CSS properties applied to the element after cascading and inheritance have been applied.

Here’s an example that demonstrates the usage of getComputedStyle():

// Get the element
const element = document.getElementById('myElement');

// Get the computed style of the element
const computedStyle = window.getComputedStyle(element);

// Access specific computed style properties
const width = computedStyle.width;
const height = computedStyle.height;
const color = computedStyle.color;

console.log(width); // Output: e.g., "100px"
console.log(height); // Output: e.g., "50px"
console.log(color); // Output: e.g., "rgb(255, 0, 0)"

In this example, we first obtain a reference to an HTML element using its ID. We then use window.getComputedStyle() to retrieve the computed style of that element. The resulting computedStyle object contains the computed values for all CSS properties applied to the element.

To access specific computed style properties, you can use dot notation or bracket notation on the computedStyle object. In the example, we access the width, height, and color properties.

Note that the returned values are in string format and may include units (e.g., “px” for pixels). You may need to parse or manipulate the values based on your requirements.

By using window.getComputedStyle(), you can programmatically access and retrieve the computed style properties of an element in JavaScript.