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JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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HTML

            
              <p><a href="" class="link1">Pupper doggo woofer</a> such <a href="" class="link2">treat yapper ruff me a frighten</a> you are doing me the shock, borking doggo fluffer long bois boof puggorino what a nice floof. Noodle horse shoob noodle <a href="" class="link3">horse heckin good boys and girls</a> blep the <a href="" class="link3A">neighborhood pupper</a>, you are doin me a concern bork blep fat boi. The neighborhood pupper very taste wow woofer shoob, h*ck. <a href="" class="link4">Clouds pupperino</a> heck <a href="" class="link5">very jealous pupper</a> you are doing me the shock puggo, aqua doggo wow such tempt smol. <a href="" class="link6">Maximum borkdrive</a> bork pupper wow very biscit vvv he made many woofs, mlem very good spot heck. <a href="" class="link7">Corgo snoot I am bekom fat shooberino</a> fluffer what a nice floof, doge what a nice floof shoob clouds. Long doggo blop pupperino doge long doggo <s>wow such tempt, blop</s> heck <s class="styled">maximum borkdrive</s>. Borkdrive borkf doing me a frighten woofer, blop waggy wags.</p>

<p>Underlines are behind. Strike-throughs are in front. You can also use <span class="highlighted">background colors.</span></p>

<p class="">Let's look at what happens <span class="highlighted">when there's enough text for the text to wrap onto more than one line, and we want to use background to do some highlighting.... and, hey, maybe we don't want the highlight color to fill</span> the whole line box / don't want it to touch the other highlights. Can we adjust that?</p>

<p><a href="https://drafts.csswg.org/css-text-decor-3">Text Decoration Level 3 Draft</a> and the <a href="https://drafts.csswg.org/css-text-decor-4">Text Decoration Level 4 Draft</a> is where these things are defined.</p>

<small>This demo works differently in different browsers. At the moment, June 2019, Safari 12.1+ has the most support (although not complete). These properties are currently being added to Firefox Nightly; turn on in `about;config`. Work in underway in other browsers. Some details are still being worked out in the specs, so anything might change. Also, all of these properties are designed to work in all modern scripts, langauges, and writing systems (for overlines, sidelines, etc). So it's complicated. Be patient. And stay tuned... Fork this and play!</small>
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CSS

            
              html {
  font-family: Avenir, Helvetica, san-serif;
  margin: 3rem 5rem;
}
p {
  font-size: 200%;
}
.link2 {
  text-underline-offset: 0.35em;
  text-decoration-thickness: 0.25em;
}
.link3 { /* horse hecking */
  color: blue;
  text-underline-offset: 5px;
  text-decoration-thickness: 0.5em;
  text-decoration-skip-ink: none; /* Doesn't seem to work in Safari */
  text-decoration-color: cyan;
}
.link3A {
    color: blue;
  text-underline-offset: 5px;
  text-decoration-thickness: 0.5em;
  text-decoration-skip-ink: none; /* Doesn't seem to work in Safari */
  text-decoration-color: cyan;
  text-decoration: wavy;
}
.link4 {
  color: orange;
  text-underline-offset: 1px;
  text-decoration-thickness: 10px;
}
.link5 {
  color: orange;
  text-underline-offset: -5px; /* This should not make the underline disappear, imho */
  text-decoration-thickness: 10px;
}
.link6 {
  color: green;
  text-underline-offset: 1px;
  text-decoration-thickness: 1px;
}
.link7 {
  text-underline-position: under; 
 }

s.styled {
  text-decoration-color: cyan;
  text-decoration-thickness: 5px;
}

.highlighted {
  background-color: yellow;  
}
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