p {
    font-size: 16px;
    margin-top: 0;
    margin-bottom: 16px;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 400;
    margin-top: 0;
    margin-bottom: 16px;
}

<h1>H1 Heading</h1>
<h2>H2 Heading</h2>
<h3>H3 Heading</h3>
<h4>H4 Heading</h4>
<h5>H5 Heading</h5>
<h6>H6 Heading</h6>

<b></b>                      bold text, without any extra importance
<strong></strong>            strong text, with added semantic importance
<i></i>                      italic text, without any extra importance
<em></em>                    emphasized text, with added semantic importance
<small></small>              for make a smaller secondary text with font-size: 75%
<ins></ins>                  inserted text
<del></del>                  deleted text
<sup></sup>                  superscript text
<sub></sub>                  subscript text
<abr></abr>                  for abbreviation
<q></q>                      for inline quotes
<blockquote></blockquote>    for block quotes
<address></address>          for blockquote author

<p><b>bold text</b></p>
<p><strong>strong text</strong></p>
<p><i>italic text</i></p>
<p><em>emphasized text</em></p>
<h1>Main Text <small>(secondary text)</small></h1>
<p><ins>inserted text</ins></p>
<p><del>deleted text</del></p>
<p>6<sup>am</sup></p>
<p>x<sub>1</sub></p>
<p><abbr title="World Wide  line-lg Web">www</abbr></p>
<p>Say: <q>"Hello, World!"</q></p>
<blockquote>
    <p>Hello, World!</p>
    <address>"By HTML"</address>
</blockquote>

<kbd></kbd>      for keyboard input
<mark></mark>    marks an inline code or text

<p>Press <kbd class="kbd">Ctrl + A</kbd> to select all.</p>
<p>This is a paragraph with a <mark>mareked text</mark>.</p>

<var></var>      defines a variable with a monospace blue font
<code></code>    inline text with a monospace font
<samp></samp>    represents sample output from a computer program
<pre></pre>      defines preformatted tex

<code><var>z</var> = <var>x</var> + <var>y</var></code>

img {
    border-style: none;
    max-width: 100%;
    vertical-align: middle;
}

ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
ol {
    list-style-type: decimal;
    padding-left: 2rem;
    padding-right: 2rem;
}
dl dt {
    font-weight: 600;
}
dl dd {
    margin-bottom: 0.8rem;
}
dl, ol, ul {
    margin-top: 0;
    margin-bottom: 1.6rem;
}

pi-{*}        *: {Polaris Icons}