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Showing content from https://developer.mozilla.org/en-US/docs/Web/HTML/Element/pre below:

<pre>: The Preformatted Text element - HTML: HyperText Markup Language

Baseline Widely available

The <pre> HTML element represents preformatted text which is to be presented exactly as written in the HTML file. The text is typically rendered using a non-proportional, or monospaced font.

Whitespace inside this element is displayed as written, with one exception. If one or more leading newline characters are included immediately following the opening <pre> tag, the first newline character is stripped.

<pre> elements' text content is parsed as HTML, so if you want to ensure that your text content stays as plain text, some syntax characters, such as <, may need to be escaped using their respective character references. See escaping ambiguous characters for more information.

<pre> elements commonly contain <code>, <samp>, and <kbd> elements, to represent computer code, computer output, and user input, respectively.

By default, <pre> is a block-level element, i.e., its default display value is block.

<pre>
             S
             A
            LUT
             M
            O N
            D  E
            DONT
           E SUIS
           LA LAN
          G U E  É
         L O Q U E N
        TE      QUESA
       B  O  U  C  H  E
      O        P A R I S
     T I R E   ET   TIRERA
    T O U             JOURS
   AUX                  A  L
 LEM                      ANDS   - Apollinaire
</pre>

pre {
  font-size: 0.7rem;
  margin: 0;
}

This element only includes the global attributes.

width Deprecated Non-standard

Contains the preferred count of characters that a line should have. Though technically still implemented, this attribute has no visual effect; to achieve such an effect, use CSS width instead.

wrap Non-standard Deprecated

Is a hint indicating how the overflow must happen. In modern browser this hint is ignored and no visual effect results in its present; to achieve such an effect, use CSS white-space instead.

It is important to provide an alternate description for any images or diagrams created using preformatted text. The alternate description should clearly and concisely describe the image or diagram's content.

People experiencing low vision conditions and browsing with the aid of assistive technology such as a screen reader may not understand what the preformatted text characters are representing when they are read out in sequence.

A combination of the <figure> and <figcaption> elements, supplemented by the ARIA role and aria-label attributes on the pre element allow the preformatted ASCII art to be announced as an image with alternative text, and the figcaption serving as the image's caption.

<figure>
  <pre role="img" aria-label="ASCII COW">
      ___________________________
  &lt; I'm an expert in my field. &gt;
      ---------------------------
          \   ^__^
           \  (oo)\_______
              (__)\       )\/\
                  ||----w |
                  ||     ||
  </pre>
  <figcaption id="cow-caption">
    A cow saying, "I'm an expert in my field." The cow is illustrated using
    preformatted text characters.
  </figcaption>
</figure>

• MDN Understanding WCAG, Guideline 1.1 explanations
• H86: Providing text alternatives for ASCII art, emoticons, and leetspeak | W3C Techniques for WCAG 2.0

<p>Using CSS to change the font color is easy.</p>
<pre><code>
body {
  color: red;
}
</code></pre>

Suppose you want to demonstrate HTML code in a <pre> element. The character sequences that define valid HTML tags (starting with < and ending with >) will not be displayed. To display the tag characters as text, you need to escape (at least) the < character using its character reference, so that the sequences no longer define valid tags.

In reality, the HTML parser treats most characters as plain text unless in specific contexts. For example, < code is fine, but <code would be misparsed; &am; is fine, but & is not. However, it's a good practice to escape all ambiguous characters to avoid any confusion, especially if you are programmatically generating HTML and injecting the <pre> content. In this case, here's a good rule of thumb for how to escape characters:

1. First, write the content out, as you would like it to appear in the HTML document.
2. Replace any ampersands (&) with &. Do this step first, so that new & characters generated in the next step don't get escaped.
3. Replace any < characters with <.

This should result in the content being displayed as you intended. The replacement of other HTML syntax characters is optional (like > to >, " to ", and ' to '), but will do no harm.

<pre><code>
let i = 5;

if (i &lt; 10 &amp;&amp; i &gt; 0)
  return &quot;Single Digit Number&quot;
</code></pre>

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