Yes using something like &quot;strong&quot; rather than &quot;bold&quot; as they did in the HTML spec.<p>For custom sections where you want to add styles you should consider what you are styling such as an &quot;event&quot;, &quot;highlight&quot;, &quot;keyword&quot;, &quot;first&quot;, &quot;last&quot; etc. Although the HTML5 tags are a lot more descriptive, numerous and extensible now, so css classes may not be the only option to add style descriptors to your content.