what does float left do in css code example

Example 1: how to clear floats

This is the code 

.float-wrapper::after {
  content: "";
  clear: both;
  display: block;
}
---------------------------------------------------------------
Explanation:

.float-wrapper -> is some parent element that wraps the floating items

example:
<div class='float-wrapper'>
     <div class='floating-item'> </div>
     <div class='floating-item'> </div> 
     ....
 </div>

::after  adds  an element after the .float-wrapper, that 
has no content and clears floats from the both sides, making sure, 
other sections are not affected by floats

Example 2: html code to float image right

<!DOCTYPE html>
<html>
<body>

<h2>Floating Images</h2>
<p><strong>Float the image to the right:</strong></p>

<p>
<img src="smiley.gif" alt="Smiley face" style="float:right;width:42px;height:42px;">
A paragraph with a floating image. A paragraph with a floating image. A paragraph with a floating image.
</p>

<p><strong>Float the image to the left:</strong></p>
<p>
<img src="smiley.gif" alt="Smiley face" style="float:left;width:42px;height:42px;">
A paragraph with a floating image. A paragraph with a floating image. A paragraph with a floating image.  
</p>

</body>
</html>

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