echo HtmlTag::createTag('br');

<br />

echo HtmlTag::createTag('img',['src' => 'x.gif']);

<img src="x.gif" />

echo HtmlTag::create()
  ->setTag('div')
  ->setId('dog-tag')
  ->addClass('dogs', 'tag',['yellow','red'])
  ->setAttribute('title', 'Dog Tags')
  ->setContent('Hey There<a href="">');

<div id="dog-tag" class="dogs tag yellow red" title="Dog Tags">Hey There&lt;a href=&quot;&quot;&gt;</div>