<p>The <strong class=html>H1</strong> element defines a <em>level-one heading</em>. A document generally should have exactly one <strong class=html>H1</strong> element to mark the most important heading.</p>
<div class=transitional>
<p>The <a href="../deprecated.html">deprecated</a> <strong class=html>ALIGN</strong> attribute suggests the horizontal alignment for the heading on visual browsers. Possible values are <strong class=html>left</strong>, <strong class=html>right</strong>, <strong class=html>center</strong>, and <strong class=html>justify</strong>. <a href="http://www.htmlhelp.com/reference/css/">Style sheets</a> provide greater flexibility in suggesting alignment.</p>
</div>
<p>Visual browsers typically render <strong class=html>H1</strong> in a large, bold font. Authors can suggest a presentation for <strong class=html>H1</strong> through style sheets. The following <abbr class=initialism title="Cascading Style Sheets"><a href="http://www.htmlhelp.com/reference/css/">CSS</a></abbr> ruleset suggests a presentation for all <strong class=html>H1</strong> elements:</p>
<pre class=example><code class=css>h1 {
color: #c33;
background: transparent;
font-weight: bold;
text-align: center
}</code></pre>
<p class=note>Authors should not choose a heading level based on the font size commonly used by visual browsers. The heading level should be chosen based on the heading's importance and placement in the document. An <strong class=html>H1</strong> is typically used as the main heading for a document.</p>
<h2>More Information</h2>
<ul>
<li><a href="http://www.w3.org/TR/REC-html40/struct/global.html#edef-H1">H1 in <abbr class=initialism title="World Wide Web Consortium">W3C</abbr> HTMLá4.0 Recommendation</a></li>
<li><a href="http://www.w3.org/TR/REC-html32#headings">H1 in <abbr class=initialism title="World Wide Web Consortium">W3C</abbr> HTMLá3.2 Recommendation</a></li>
<li><a href="http://www.w3.org/MarkUp/html-spec/html-spec_5.html#SEC5.4">H1 in HTMLá2.0 Standard</a></li>
<li><a href="http://www.htmlhelp.com/reference/wilbur/block/h1.html">H1 in <abbr class=initialism title="Web Design Group">WDG</abbr> HTMLá3.2 Reference</a></li>
<li><a href="http://www.hut.fi/u/jkorpela/HTML3.2/5.26.html">H1 in <cite>Learning HTMLá3.2 by Examples</cite></a></li>
</ul>
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