These tags define heading styles of varying sizes, with <h1> being the largest and <h6> being the smallest. The exact details of each type of heading are described in Default System Fonts and Leading.
align, id, lang, style, class, title (ignored)
<h1>This is the h1 header size</h1>
<h2>This is the h2 header size</h2>
<h3>This is the h3 header size</h3>
<h4>This is the h4 header size</h4>
<h5>This is the h5 header size</h5>
<h6>This is the h6 header size</h6>
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