Is it possible to extend a DIV to 100% without affecting the width of its parent element set to auto?

Imagine having a DIV with multiple inner-DIVs:

<div id="parent">
 <div id="a"></div>
 <div id="b"></div>
</div>

All the inner-DIVs need to have the same width, which should be equal to the widest DIV. The parent element itself does not have a defined width.

How can this be achieved?

I initially assumed that using width: 100% would solve it, but that ends up stretching the parent element to full window size.

Here is a visual representation:

################
#**************#
#*aaaaaaaaaaaa*#
#**************#
#*********     #
#*bbbbbbb*     #
#*********     #
################

Instead, we want it to look like this:

################
#**************#
#*aaaaaaaaaaaa*#
#**************#
#**************#
#*bbbbbbb     *#
#**************#
################

In this illustration, # symbolizes the parent DIV, which should not occupy the entire window width.

Answer №1

Initially, addressing a CSS-related inquiry like this would be best suited for the sister site of SO called DocType, which specializes in CSS and website design.

Regarding your issue, divs are block-level elements and automatically expand to fill all available space. If this is not occurring, then there may be another style overriding it. For a simple solution, try adding the following:

#parent {
    position: relative;
}

This adjustment may resolve your problem. However, if it persists, there could be conflicts within your CSS code. By providing more specific examples or snippets, we can offer better assistance. As stated in the SO FAQ, DocType is specifically designed for handling these types of inquiries.

Answer №2

A div's size is typically determined by its contents. To ensure two inner divs have equal width, set the width to 50% and float one div to the left of the other. Additionally, add a clear:both property to the outer div.

For more information, check out this useful resource:

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