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HTML

              
                <main>
<h1>Text-spacing Bookmarklet</h1>

<p>To help test WCAG Success Criterion <a href="https://www.w3.org/TR/WCAG21/#text-spacing" style="font-weight: bold;">1.4.12 Text Spacing</a> (Level AA)</p>

<p>Drag this link into the Bookmarks Bar: <a class=bookmarklet href="javascript:(function(){const style=document.createElement('style');style.setAttribute('rel','stylesheet'),style.textContent='*{line-height:1.5 !important;letter-spacing:0.12em !important;word-spacing,0.16em !important;}p{margin-bottom:2em !important;}',document.head.appendChild(style);})();">Text-spacing test</a> For use on any web page, or click the link to see it in action on this page. Examine the JS panel on this pen to see how it was coded.</p>

<h2>Extract from the W3C documentation</h2>

<p>In content implemented using markup languages that support the following text style properties, no loss of content or functionality occurs by setting all of the following and by changing no other style property:</p>
<ul>

  <li>Line height (line spacing) to at least 1.5 times the font size;</li>

  <li>Spacing following paragraphs to at least 2 times the font size;</li>

  <li>Letter spacing (tracking) to at least 0.12 times the font size;</li>

  <li>Word spacing to at least 0.16 times the font size.</li>

</ul>

<p>Exception: Human languages and scripts that do not make use of one or more of these text style properties in written text can conform using only the properties that exist for that combination of language and script.</p>

<h3>Examples of failure</h3>
<figure>

  <figcaption><strong>Figure 1</strong> Vertical text cut off is a failure.</figcaption>
  <img src="https://www.w3.org/WAI/GL/low-vision-a11y-tf/wiki/images/b/ba/Spacing_cutoff_fail_vertical.png" alt="Heading text truncated vertically." width="420" height="190">
  <p>Usually caused by a fixed height container.<br>If so, the solution is to replace <code>height: XXpx</code> with <code>min-height: XXpx</code>.</p>
</figure>

<figure>

  <figcaption><strong>Figure 2</strong> Horizontal text cut off is a failure.</figcaption>
  <img src="https://www.w3.org/WAI/GL/low-vision-a11y-tf/wiki/images/c/c2/Spacing_cutoff_fail_horizontal.png" alt="3 side-by-side headings with truncated text." width="509" height="184">
  <p>Usually caused by the removal of text wrapping, which is either a <code>white-space</code> or a flex box issue.<br>If so, the solution is to ensure <code>white-space</code> is set to <code>wrap</code>. If it's a flex box issue, then set <code>flex-wrap</code> to <code>wrap</code>.</p>

</figure>

<h2>The bookmarklet code</h2>

<figure>

  <figcaption>ES6 JavaScript:</figcaption>
  <pre><code class=language-js tabindex=0 spellcheck=false contenteditable>const style = document.createElement('style');
style.setAttribute('rel', 'stylesheet');
style.textContent = `
* {
  line-height: 1.5 !important;
  letter-spacing: 0.12em !important;
  word-spacing", 0.16em !important;
}
p {
  margin-bottom: 2em !important;
}
`;
document.head.appendChild(style);</code></pre>

</figure>

<figure>

  <figcaption>Use an IIFE to contain the bookmarklet JavaScript:</figcaption>
  <pre><code class=language-js tabindex=0 spellcheck=false contenteditable>javascript:(function(){/*&hellip; code here &hellip;*/})();</code></pre>

</figure>

<figure>

  <figcaption>Compressed JavaScript in an IIFE (ready for use):</figcaption>
  <pre><code class=language-js tabindex=0 spellcheck=false contenteditable>javascript:(function(){const style=document.createElement('style');style.setAttribute('rel','stylesheet'),style.textContent='*{line-height:1.5 !important;letter-spacing:0.12em !important;word-spacing",0.16em !important;}p{margin-bottom:2em !important;}',document.head.appendChild(style);})();</code></pre>

</figure>

<p>Note: <code>pre</code> may also cause horizontal cut off, but it is an expected feature due to the nature of preformatting <code>pre {overflow-y: auto;}</code> and is <strong>not</strong> considered a failure.</p>

</main>
<!--  Footer include -->
[[[https://codepen.io/2kool2/pen/mKeeGM]]]
              
            
!

CSS

              
                body {
  font-family: sans-serif;
  max-width: 40em;
  margin: 2rem;
}
@media (min-width: 44em) {
  body {
    margin: 2rem auto;
  }
}
h1 {
  line-height:1;
}
h2 {
  margin: 2em 0 1em;
}
figure {
  margin: 1rem auto;
}
figure img {
  width: fit-content;
}
figure + figure,
figure + p {
  margin-top: 2rem;
}
figcaption {
  margin-bottom: .5em;
}
:not(pre) > code {
  display: inline-block;
  width: fit-content;
  font: inherit;
  font-family: monospace, monospace;
  background-color: #efe;
  padding: .125em .25em;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}
a:focus-visible {
  outline: 3px solid #b3d4ff !important;
  outline-offset: 3px !important;
}

.bookmarklet {
  width: -moz-fit-content;
  width: fit-content;
  display: block;
  margin: 1rem auto;
  padding: .25em .5em;
  background-color: #efe;
}
              
            
!

JS

              
                // Force Prism code highlighting to light mode
document.body.setAttribute('data-lightmode', 'light');
              
            
!
999px

Console