How Can I Make an Element's Minimum Width Equal to Its Dynamic Height Using CSS?

Setting Element Width Based on Height Via CSS

Problem:

How can you ensure that the minimum width of an element equals its height, without explicitly setting the height? This is particularly useful when the height is dynamic and cannot be set upfront.

Possible Solutions:

1. jQuery Approach:

Using jQuery, you can set the element's minimum width to match its current height:

$(document).ready(function() {
    $('.myClass').each(function() {
        $(this).css('min-width', $(this).css('height'));
    });
});

2. CSS-Only Approach (Aspect Ratio Trick):

Surprisingly, it is possible to achieve the desired behavior directly in CSS without JavaScript. The key is to use an element:

.container {
    position: relative;
    display: inline-block;
    height: 50vh; /* Adjust this based on desired height */
}

.container > img {
    height: 100%; /* Inherits container's height */
}

.contents {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}

The element will automatically scale its width to maintain its intrinsic aspect ratio of 1:1. This means that the width of the and the element it contains () will always be equal to the height of the container.

Customization:

To customize the aspect ratio, adjust the height of the element. For example, to create a 4:3 aspect ratio, set the height to 133%.

Live Demo:

https://jsbin.com/koyuxuh/edit

Alternate Method (Canvas or SVG):

You can also use a or to create the aspect ratio behavior. The principles remain the same.

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