How to Get Accurate Dimensions of a Rotated Element in JavaScript?

Determining Element Dimensions After Rotation

Problem: After applying a transformation like transform: rotate(45deg);, obtaining accurate width and height properties for the rotated element can be challenging. Conventional approaches may still report the original dimensions instead of the actual transformed dimensions.

Solution: To retrieve the transformed width and height, leverage the HTMLDOMElement's getBoundingClientRect(). This method returns an object containing essential properties of the element's rendered box, including its true height and width, regardless of applied transformations.

Example Implementation:

Consider the following HTML and JavaScript:

<code class="html"><div id="my-div" style="width: 10px; height: 10px;">
</div></code>

<code class="javascript">const div = document.getElementById('my-div');
div.style.transform = 'rotate(45deg)';

const rect = div.getBoundingClientRect();

console.log(`Rotated dimensions: ${rect.width} x ${rect.height}`);</code>

This code snippet retrieves the rotated dimensions of the element as reported by the getBoundingClientRect() method. In this case, the output would be 17 x 17, reflecting the actual width and height of the rotated square.

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