Adjusting the border of the parent div significantly impacts its overall dimensions

Here is some HTML code. Removing the "border: 1px solid" property from the yellow box causes it to shrink significantly.

But why does this happen?

UPDATE: Changing the p tag to display as inline-block keeps the size consistent. It appears that the p tag is the issue... but why would a border in the outer div cause such a drastic change in size for an inline element?

<body style="height:100%">

  <div style="background-color: red; border-style:solid;">
    <div style="background-color: yellow; border:1px solid;">
      <p>Inside</p>
    </div>
    <p>Something</p>
  </div>


  <div style="background-color: blue; border-style:solid;">
    <p>Something else </p>
  </div>

</body>

To see a live demonstration, visit: http://jsfiddle.net/C2D49/

htmlcss

Answer №1

Below is the information you requested:

Margin Collapsing

Adjacent siblings

When two sibling elements have margins that touch, the margins will collapse into one. This behavior does not occur when there are floats involved.

Parent and first/last child

If there is no border, padding, inline content, or clearance between a parent block element and its first or last child block element, their margins will collapse. The resulting margin will be outside of the parent element's box.

Empty blocks

In cases where a block element has no border, padding, inline content, height, or min-height separating its top and bottom margins, those margins will collapse together.

You can observe this behavior in action by checking out this fiddle: It showcases how adding a few span elements prevents margin collapsing. http://jsfiddle.net/aPaBy/

<div style="background-color: red; border-style:solid;">
   <div id="test" class="border" style="background-color: yellow;">
     <span>hi</span>
      <p>Inside <button>Test</button></p>
     <span>hi</span>
    </div>
    <p>Something</p>
  </div>

Answer №2

I believe the issue may be related to the lack of resets in your code. Try implementing the following solution in your CSS:

*{margin:0px;padding:0px;}

Feel free to adjust the margin and padding values as needed. This should resolve the issue effectively. Give it a try!

I have made changes to your fiddle for reference: http://jsfiddle.net/BbKED/1/

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