understanding the rem and em code example

Example 1: em vs rem

1EM or 1REM (r = root em)
The difference is inheritance.
The Rem value is based on the root element (html).
What is meant here is the font size for html and not the font size for the documet body.
... Em is based on the font size of each
Parent element.

Example 2: difference between rem and em css

Explanation: If you run these code you understand differences between rem vs em
In this example, font-size of first h1 is 48px (nearest parent) and font-size 
of second h1 is 32px ( parent of page which is html)
<style>
  html {
    font-size: 32px;
  }
  .font {
    font-size: 48px;
  }
  .em {
    font-size: 1em;
  }
  .rem {
    font-size: 1rem;
  }
</style>
<body>
  <div class="font">
    <h1 class="em">Hey guys!</h1>
  </div>
  <div class="font">
    <h1 class="rem">Hey guys!</h1>
  </div>
</body>

Tags:

Css Example

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