How Can I Animate an Element\'s Width When Its Width is Set to \'auto\'?

Animating Element Width with Auto Width

Question:

How can one animate the width of an element with a fixed width: auto value?

Background:

An element with width: auto will adjust its width based on its content. However, it's not possible to directly animate auto.

Answer:

To achieve animated width changes with width: auto, one can use either the max-width/max-height trick or a JavaScript-based solution.

Max-Width/Max-Height Trick:

1. Set a sufficient maximum width (max-width) or maximum height (max-height) to accommodate the widest or tallest content.
2. Create an inner element within the parent element and animate its max-width or max-height based on the content changes.

JavaScript Solution:

1. Use JavaScript to calculate the required width based on the content.
2. Set the element's width using JavaScript, ensuring the transition is smooth with transition property set on the element.

In the provided example, the max-width/max-height trick is implemented to animate the element's width when the user hovers over it.

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