Revision 720155 of class

<p class="note">{{GlobalAttributesQL}}</p>
<p>The <strong>class</strong> global attribute is a space-separated list of the classes of the element. Classes allows CSS and Javascript to select and access specific elements via the <a href="/En/CSS/Class_selectors" title="https://developer.mozilla.org/En/CSS/Class_selectors">class selectors</a> or functions like the DOM method {{domxref("document.getElementsByClassName")}}.</p>
<p>Though the specification doesn't put requirements on the name of classes, web developers are encouraged to use names that describe the semantic purpose of the element, rather to the presentation of the element (e.g., <em>attribute</em> to describe an attribute rather than <em>italics</em>, although an element of this class may be presented by <em>italics</em>). Semantic names remain logical even if the presentation of the page changes.</p>
<h2 id="Specifications_2">Specifications</h2>
<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('HTML WHATWG', "elements.html#classes", "class")}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
   <td>No change from latest snapshot, {{SpecName('HTML5.1')}}</td>
  </tr>
  <tr>
   <td>{{SpecName('HTML5.1', "elements.html#classes", "class")}}</td>
   <td>{{Spec2('HTML5.1')}}</td>
   <td>Snapshot of {{SpecName('HTML WHATWG')}}, no change from {{SpecName('HTML5 W3C')}}</td>
  </tr>
  <tr>
   <td>{{SpecName('HTML5 W3C', "elements.html#classes", "class")}}</td>
   <td>{{Spec2('HTML5 W3C')}}</td>
   <td>Snapshot of&nbsp; {{SpecName('HTML WHATWG')}}. no change from {{SpecName('HTML4.01')}}</td>
  </tr>
  <tr>
   <td>{{SpecName('HTML4.01', "struct/global.html#h-7.5.2", "class")}})</td>
   <td>{{Spec2('HTML4.01')}}</td>
   <td>&nbsp;</td>
  </tr>
 </tbody>
</table>
<h2 id="Browser_compatibility_2">Browser compatibility</h2>
<p>{{ CompatibilityTable() }}</p>
<div id="compat-desktop">
 <table class="compat-table">
  <tbody>
   <tr>
    <th>Feature</th>
    <th>Chrome</th>
    <th>Firefox (Gecko)</th>
    <th>Internet Explorer</th>
    <th>Opera</th>
    <th>Safari</th>
   </tr>
   <tr>
    <td>Basic support</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
   </tr>
  </tbody>
 </table>
</div>
<div id="compat-desktop">
 <table class="compat-table">
  <tbody>
   <tr>
    <th>Feature</th>
    <th>Android</th>
    <th>Chrome for Android</th>
    <th>Firefox Mobile (Gecko)</th>
    <th>IE Mobile</th>
    <th>Opera Mobile</th>
    <th>Safari Mobile</th>
   </tr>
   <tr>
    <td>Basic support</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
    <td>{{ CompatVersionUnknown() }}</td>
   </tr>
  </tbody>
 </table>
</div>
<h2 id="See_also">See also</h2>
<ul>
 <li>All <a href="/en-US/docs/Web/HTML/Global_attributes">global attributes</a>.</li>
</ul>