List items that are not in a specific order causing the parent element to be

I'm facing an issue with two nested divs, where the #messages div is inside the #mainContent div. The position of the #messages div should be 0px from the top of its parent, but when I add an unordered list inside it, the whole div shifts down by a few pixels.

Setting margin-top:0px; on the ul element resolves the issue, however, I need the ul to have a margin-top:10px; from its #messages parent. But adding margin-top:10px; once again pushes the #messages div down by 10px from #mainContent.

I would appreciate an explanation of why this behavior occurs and a clean solution to address this problem.

Your assistance is greatly appreciated, and here is the link to the jsfiddle:

http://jsfiddle.net/wtKuP/4/

htmlcss

Answer №1

"Could someone shed some light on why this issue is occurring, and does anyone have a suitable solution to address it?"

When it comes to block-level elements, the top margins of such an element and its first in-flow block-level child will always collapse. There are various methods to prevent this (refer to the link above for a comprehensive list) - one effective approach is adding overflow: hidden to the parent of the <ul>, as this action creates a new Block Formatting Context and eliminates the typical margin collapsing behavior.

http://jsfiddle.net/wtKuP/22/

According to Section 8.3.1 of the 2.1 Spec:

Margins of elements that establish new block formatting contexts (such as floats and elements with 'overflow' other than 'visible') do not collapse with their in-flow children.

Answer №2

Apply 

margin:0;
padding:0;

to each division. In this way, the unordered list will be spaced 10 pixels away from the messages division, while the messages division will have no spacing with the main content.

Answer №3

Include ul:{padding:0;}. It is recommended to utilize the Eric Meyer reset.css to mitigate inconsistencies across different browsers.

Answer №4

Check out this solution:

Updated JSFiddle link with the requested modifications

<div id="mainContent">
<div id="messages">
<ul>
<li>By removing the UL and LI elements, the #messages div will be positioned 0px from the top of its parent div #mainContent. Curious why?</li>
</ul>
</div>
</div>

Additionally...

div#mainContent {
    border:1px solid black;
    position:absolute;
    width:500px;
    height:600px;
    margin-top:50px;
    margin-left:-250px;
    left:50%;
}
#mainContent > #messages {
    margin: 0;
    width:499px;
    height:525px;
    background-color:red;
}

#messages ul { 
    display: inline-block;
    margin-top: 10px;
}

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