Relative units giving rise to unequal side margins : measurement « Style Basics « HTML / CSS

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Relative units giving rise to unequal side margins

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html xmlns="" xml:lang="en" lang="en">
  <meta http-equiv="content-type" content="text/html; charset=utf-8" />
  <title>Relative units giving rise to unequal side margins</title>
  <style type="text/css">
      font-size: 1em;
      margin: 0 0 0 2em;
      font-size: 1.5em;
      margin: 0 0 0 2em;
    <h1>A heading</h1>
    <p>Some body text</p>

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