In HTML, an important concept to understand is how float:left is necessary when the combined widths of child blocks equal

Apologies if my question seems redundant, I was having trouble finding the right search terms.

Let's discuss a scenario with a parent <div> containing two inline-block children, each with a width of 50%. If we don't apply overflow: hidden to the parent and float: left to the children, they won't align in a single row within the parent element.

But why is this the case? Why doesn't 50% + 50% equal one full row? What's the significance of using float in this context?

Answer №1

One common reason for this issue is the presence of white spaces between child nodes:

#container{
  background: red;
  height: 50px;
}
#container div{
  width: 50%;
  display: inline-block;
  background: green;
  height: 100%;
}
<div id="container">
  <div></div>
  <div></div>
</div>

To resolve this, simply remove the whitespace between the elements:

#container{
  background: red;
  height: 50px;
}
#container div{
  width: 50%;
  display: inline-block;
  background: green;
  height: 100%;
}
<div id="container">
  <div></div><!--
  --><div></div>
</div>

Another common cause could be the default margin set by browsers:

#container{
  background: red;
  height: 50px;
}

#container div{
  width: 50%;
  display: inline-block;
  background: green;
  height: 100%;
  margin: 8px;  /* browser default */
}
<div id="container">
  <div></div><!--
  --><div></div>
</div>

To fix this, override the default margin with margin: 0.

Answer №2

In addition to considering the spaces in your design. If floats are not preferred, there are two alternative options available: either commenting out the spaces between HTML tags or adjusting the font size to 0px on the parent element and then reverting it back for the children elements.

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