You can achieve this using CSS, particularly using the :nth-child() selector and the max-height property. However, since CSS doesn't have a built-in way to select the first N children directly, we can use a workaround using Flexbox to achieve the desired behavior.

Assuming you have an HTML structure like this:

html
<div class="parent"> <div class="child">Child 1</div> <div class="child">Child 2</div> <div class="child">Child 3</div> <!-- Add more child elements as needed --> </div>

You can use the following CSS code to set the first N children's height to the parent's max-height:

css
.parent { /* Set the parent's maximum height */ max-height: 200px; overflow: hidden; /* Use flexbox to control child elements */ display: flex; flex-direction: column; } /* Select the first N children (e.g., first 3 children) */ .child:nth-child(-n + 3) { /* Set the height to fill the parent's max-height equally */ flex: 1; }

In this example, we are setting the parent's max-height to 200px and using overflow: hidden to hide any overflow beyond that height. By using Flexbox (display: flex) and setting flex: 1 for the first three children (.child:nth-child(-n + 3)), we are making them equally fill the available space within the parent's max-height.

The number 3 in nth-child(-n + 3) represents the first 3 children. You can change it to any desired number to set the first N children's height to the parent's max-height.

With this approach, the first N children will take up the available space within the parent's max-height, and any additional children beyond N will be hidden due to the overflow: hidden property on the parent.

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