Inherit margins from child elements with fixed positions

Below is a very basic code example to consider:

<div id="parent">
 <div id="child">
    Test it
 </div>
</div>

This code snippet includes the following CSS styles:

#parent{
position:relative;
margin-left:200px;
color:#FFF;
}
#child{
position:fixed;
top:30px;  
background-color:red;
}

I assumed that the child div wouldn't inherit the margin-left property from its parent div due to breaking the normal flow. Surprisingly, not only does it inherit the 200px margin, but when attempting to assign a left margin of 50px to the child div, the result shows a total left margin of 250px! Why does this happen and how can I change it?

Thank you

Find the Jsfiddle link here: http://jsfiddle.net/rCMx2/

Answer №1

If you don't specify horizontal positioning axes (left: ... or right: ...), a child element will still be positioned horizontally as if it weren't fixed. The same goes for vertical axes (top: ... or bottom: ...) and its vertical position.

Even though the element is fixed, it will stay in its original position without moving when these properties are not defined.

In essence, using position: fixed and top: ... won't change the horizontal position of the element, only its vertical position. The horizontal position remains unchanged.

To solve this issue, add left: ... or right: ... to the fixed element to detach it from its initial horizontal position.

Answer №2

By adding a margin of 50px on top of the margin for your parent element, you can visually see how it affects the layout:

#parent{
  margin-left:200px;
  color:#FFF;
  border:2px solid #f0f;
  overflow:visible;
}

#child{
  top:30px;  
  background-color:red;
  margin:20px;
  border:2px solid #0f0;
}

Give it a try and see if you can better understand how the margins work without the "position" attributes included.

To create a more specific layout, it's important to clarify what you envision for the final result.

Answer №3

She takes over the position of a 200px parent div that is currently on. Since the child div is fixed, it references the parent to continue flowing independently.

You have the option to detach the child div from its parent, separating them completely.

Also, align the fixed div to be 50px from the left instead of using margin-left: 50px.

I hope this explanation clarifies things for you.

For more information, please check out this example:

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