03. Math and Computer Code <sub>, <sup>, <var>, <kbd>, <samp>, <code>, <pre>

Mathematic or Scientific Elements

To specify a subscript or superscript, use <sub> and <sup>.

Additionally, we use the <var> tag to specify any variables.

H<sub>2</sub>O
<var>y</var> = <var>x</var><sup>3</sup>

H2O

y = x3

Keyboard Formatting and User Input

Use the <kbd> to specify keyboard input.

<kbd>$ alias ..="cd .."</kbd>

$ alias ..="cd .."

Sample output

To specify sample output, use the <samp> tag.

<samp>Sample code output goes here.</samp>

Sample code output goes here.

Sample code

To specify a code snippet, use the <code> tag.

<code>
  public static void main(String[] args) {
    System.out.println("Hello World!");
  }
</code>

Using the <pre> tag for preformatted text

You may have noticed that HTML truncates white space and line breaks. For example, consider the following code snippet:

<p>         hello 
 
world     </p>

The white space and line breaks don't appear on the document page. HTML truncates all that and simply prints out: hello world.

To get around this, simply wrap your content in the <pre> tags.

<pre><p>         hello 
 
 world     <p></pre>

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