Why Do Floated Child Divs Sometimes Have a Height of 0px, and How Can I Fix It?

Achieving 100% Height for Floated Child Divs

When utilizing a floated child div within a parent div, you may encounter situations where the child div assumes a height of 0px. This seemingly puzzling behavior stems from the way floating elements interact with their parents.

In this particular case, the inner div is set to float left and assigned a height of 100%. However, this configuration fails to achieve the desired result.

The key to resolving this issue lies in modifying the CSS properties of the parent div. By setting the display property to flex, you can force the parent div to behave like a flex container, enabling its child elements to stretch to their full height.

Here's the modified CSS code for the parent div:

#outer {
  display: flex;
}

It's important to note that older browsers, such as IE9, may not fully support the flex property. Therefore, it's advisable to add vendor prefixes to ensure compatibility across different browsers. Additionally, consider using the align-items property with a value of stretch to ensure that the child div fills the entire height of the parent div.

By applying these CSS modifications, you can successfully force the inner div to assume 100% of the height of its parent div, achieving the desired vertical alignment.

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