HTML includes various elements for specifying user input and computer code. For example:

<code>
x = 5;
y = 6;
z = x + y;
</code>

HTML <kbd> Element

The HTML <kbd> element is employed to indicate keyboard input. The content within is rendered in the browser's default monospace font.

<p>Download the webpage by pressing <kbd>Ctrl + S</kbd></p> 

HTML <samp> Element

The HTML <samp> element is utilized to denote sample output from a computer program. The content inside is displayed in the browser's default monospace font.

<p>Output from Program A:</p>
<p><samp>Processing complete!<br>Press any key to continue</samp></p> 

HTML <code> Element

The HTML <code> element  is used to define a piece of computer code. The content inside is displayed in the browser's default monospace font.

<code>
x = 5;
y = 6;
z = x + y;
</code> 

Note that the <code> element does not maintain additional whitespaces and line breaks.

To address this, enclose the <code> element within a <pre> element.

<pre>
  <code>
  x = 5;
  y = 6;
  z = x + y;
  </code>
</pre> 

HTML <var> Element

The HTML <var> element is employed to define a variable in programming or a mathematical expression. The content inside is usually rendered in italics.

<p>The area of a rectangle is: <var>l</var> x <var>w</var>, 
where <var>l</var> is the length, and <var>w</var> is the width.</p>

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