<h1 align="center">Heading elements</h1>
<h2>Summary</h2>
<p>Some text here...</p>

<h2 align="center">Examples</h2>
<h3>Example №1</h3>
<p>Some text here...</p>

<h3 align="center">Example 2</h3>
<p>Some text here...</p>

<h2>See also</h2>
<p>Some text here...</p>
h1 {
    display: block;
  color: white;
    font-size: 2em;
    margin-top: 0.67em;
    margin-bottom: 0.67em;
    font-weight: bold;
  background: #fc0;  
}

External CSS

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External JavaScript

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