What is the reason behind an element occupying space despite having a height of 0?

Check out this demo for reference: https://codepen.io/jchi2241/pen/dEzMZo?editors=1100

In my current setup, I use a max-height of 0 to hide the <ul> element when the related input is unchecked. When checked, the max-height is set to 10em to reveal the content. The choice of using max-height allows for smooth opening and closing animations.

An issue that I've encountered is that even though the <ul> has a max-height of 0, it still occupies space below the <label>. This becomes apparent if the <ul> is removed or positioned absolutely/displayed none, disrupting the flow of the document's structure. These options are not viable as they would hinder the transition effects.

To reiterate the main question - why does the <ul> retain space below the <label> despite having its height set to 0? How can this space be eliminated without compromising the animation transitions?

Answer №1

To fix the issue, apply an overflow:hidden property to the element and also specify a max-height of 0

This should address the issue you are experiencing

Answer №2

This issue arises from the presence of <a> within the <li> element. In order to trigger the animation properly when clicking on the input, it is necessary to set display:off to eliminate the extra space caused by this configuration. After that, reverting back to display:on will restore the <a> within the <li>.

https://example.com/image.png

The accompanying image on the right demonstrates a reduction in spacing resulting from applying displaying:off to the <a> tag.

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