How Can I Accurately Determine the Dimensions of an HTML Element?

How to Calculate Actual Dimensions of an HTML Element

Determining the accurate width and height of an HTML element is crucial for aligning it appropriately. This article explores various techniques for retrieving actual dimensions and provides compatibility details across different browsers.

.offsetWidth and .offsetHeight

Concept: These properties indicate the width and height of an element, including padding and border.

Example:

var width = document.getElementById('foo').offsetWidth;

Browser Support: All major browsers

.getBoundingClientRect()

Concept: This method returns a DOMRect object containing various dimensions and coordinates, including width and height after applying CSS transforms.

Example:

console.log(document.getElementById('foo').getBoundingClientRect())

Output:

DOMRect {
    bottom: 177,
    height: 54.7,
    left: 278.5,​
    right: 909.5,
    top: 122.3,
    width: 631,
    x: 278.5,
    y: 122.3,
}

Browser Support:

• Desktop Browsers: Chrome, Edge, Firefox, Safari
• Mobile Browsers: Chrome for Android, iOS Safari

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