Determining parent height through the positioning of children

When it comes to CSS, it's truly fascinating until you hit a roadblock and the "aha moment" seems elusive.

Today, I'm struggling with adjusting the height of my parent div that contains a relatively positioned element. The issue arises from the child element using the 'top' property.

After gaining an understanding of how the 'top' property works on relatively positioned elements, it became clear why the proper height value is not being maintained.

My question now is:
"Is there a way to factor in this 'top' property in the height of the parent without resorting to paddings or margins?"

Feel free to check out my code on CSSDeck:
Or you can see a simplified version below:

HTML:

<div>
    <div class="relative">
    </div>
</div>

CSS:

.relative {
    position: relative;
    top: 42px;
    height: 40px;
    width: 100%;
    background: red;
}

Thank you.

Answer №1

In a situation like mine, I discovered that replacing the top: property with margin-top: worked wonders. This adjustment allowed the parent div to adjust its size accordingly.

Answer №2

When using the position "top", your object will be moved without affecting the height of its parent element. If you want to adjust its height, you will need to use margins.

Therefore, the conclusion is: "No, it is not possible." For more information, refer to this link: http://www.w3.org/TR/CSS2/visudet.html#Computing_heights_and_margins

Answer №3

To achieve the desired effect, consider inserting a blank element following the .relative class and adjusting its height to match the top position of the .relative element.

Answer №4

For those looking to achieve this using jQuery

var positionFromTop = $(".relative").css("top");
$(".relative").parent().css({"top":positionToTop});

Here is a CSSDeck link that I have customized for you

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