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Advanced formatting help

<p>
  Posts, including questions, answers, articles, tag wikis, help pages, and user profiles, support the use of the
  following HTML tags:
</p>
<ul>
  <li><code>a</code></li>
  <li><code>p</code></li>
  <li><code>span</code></li>
  <li><code>b</code></li>
  <li><code>i</code></li>
  <li><code>em</code></li>
  <li><code>s</code></li>
  <li><code>strong</code></li>
  <li><code>hr</code></li>
  <li>
    <code>h1</code>
    ,
    <code>h2</code>
    ,
    <code>h3</code>
    ,
    <code>h4</code>
    ,
    <code>h5</code>
    ,
    <code>h6</code>
  </li>
  <li><code>blockquote</code></li>
  <li><code>img</code></li>
  <li><code>strike</code></li>
  <li>
    <code>del</code>
    ,
    <code>ins</code>
  </li>
  <li><code>code</code></li>
  <li><code>kbd</code></li>
  <li><code>pre</code></li>
  <li><code>br</code></li>
  <li>
    <code>ul</code>
    ,
    <code>ol</code>
    ,
    <code>li</code>
  </li>
  <li>
    <code>sup</code>
    ,
    <code>sub</code>
  </li>
  <li><code>section</code></li>
  <li>
    <code>details</code>
    ,
    <code>summary</code>
  </li>
  <li>
    <code>table</code>
    ,
    <code>thead</code>
    ,
    <code>tbody</code>
    ,
    <code>tr</code>
    ,
    <code>th</code>
    ,
    <code>td</code>
  </li>
</ul>
<p>These tags may have the following attributes:</p>
<ul>
  <li><code>id</code></li>
  <li><code>class</code></li>
  <li><code>href</code></li>
  <li><code>title</code></li>
  <li><code>src</code></li>
  <li><code>height</code></li>
  <li><code>width</code></li>
  <li><code>alt</code></li>
  <li><code>dir</code></li>
  <li><code>lang</code></li>
  <li><code>start</code></li>
  <li><code>rowspan</code></li>
  <li><code>colspan</code></li>
</ul>
<p>Shorter text forms, such as comments, support the following HTML tags:</p>
<ul>
  <li><code>a</code></li>
  <li><code>b</code></li>
  <li><code>i</code></li>
  <li><code>em</code></li>
  <li><code>strong</code></li>
  <li><code>strike</code></li>
  <li><code>del</code></li>
  <li><code>code</code></li>
</ul>
<p>These tags may have the following attributes:</p>
<ul>
  <li><code>href</code></li>
  <li><code>title</code></li>
</ul>
<hr />
<p>
  HTML tags not on this list will be stripped out and not displayed if they are included in posts or comments. The
  source code for supported tags in posts can be found in
  <a href="https://github.com/codidact/qpixel/blob/develop/app/helpers/posts_helper.rb#L79">
    <code>posts_helper.rb</code>
  </a>
  , and for comments in
  <a href="https://github.com/codidact/qpixel/blob/develop/app/helpers/comments_helper.rb#L195">
    <code>comments_helper.rb</code>
  </a>
  .
</p>
<hr />
<p>
  <sub>
    Much of the content of this page came from
    <a href="https://meta.codidact.com/posts/277420/277424#answer-277424">this answer by luap42</a>
    .
  </sub>
</p>