What is the best method to shift an element to the top by a fraction of its height, namely -100%?

I am facing an issue with an element where I set top: -100%. My requirement is to translate top: -100% to top: -{height-of-the-element}. Unfortunately, instead of getting top: -{height-of-the-element}, I am getting

top: -{height-of-another-element-wrapping-it}
.

Let me provide some code snippets (not the complete code due to complexity) to illustrate the HTML and CSS setup:

<nav>
    <section>
        <ul>
            <li>
                <ul class="i-want-to-use-top-here"></ul>
            </li>
        </ul>
    </section>
</nav>

 

nav {
    height: 60px;
}

.i-want-to-use-top-here {
    height: 200px;
    position: absolute;
    top: -100%;
}

Why is this happening? How can I accurately get -100% of the element's height to utilize in the top property?

Answer №1

In this case, I would suggest utilizing the transform: translate() property as it allows you to position elements without worrying about affecting the normal flow. This way, adjustments to content won't require you to change the height:

.using-top-here {
  background: rgba(175,175,175, .5);
  -webkit-transform: translate(0, -100%);    
}

Check out the FIDDLE here: http://jsfiddle.net/fuBr9/

Answer №2

Include position: relative; inside the nav element and give it another shot.

Answer №3

top always positions relative to its parent element. Since it seems like you're manually setting the height in your css, why not also manually set the top value accordingly?

.i-want-to-use-top-here {
    height: 200px;
    position: absolute;
    top: -200px;
}

By setting the top value in relation to the height, you can easily adjust both programmatically if needed.

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