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HTML

            
              <article class="post">
  <p>This is a simplified example of <a href="https://eager.io/blog/smarter-link-underlines/">Smarter Link Underlines</a> built for <a href="http://sass-lang.com/"> Sass</a> rather than <a href="https://learnboost.github.io/stylus/">Stylus</a>. Original code example by <a href="https://twitter.com/adamfschwartz">Adam Schwartz</a> of <a href="https://eager.io/">eager.io</a>.</p>
  <p><a href="https://gist.github.com/jimmynotjim/16290a7ed59b6f3bb28d">View the gist on Github</a></p>
  <pre>
@mixin text-underline-crop($background) {
    text-shadow:  .03em 0 $background, 
                  -.03em 0 $background,
                  0 .03em $background,
                  0 -.03em $background,
                  .06em 0 $background,
                  -.06em 0 $background,
                  .09em 0 $background,
                  -.09em 0 $background,
                  .12em 0 $background,
                  -.12em 0 $background,
                  .15em 0 $background,
                  -.15em 0 $background;
}

@mixin text-background($color-bg, $color-text) {
    background-image: linear-gradient($color-text, $color-text);
    background-size: 1px 1px;
    background-repeat: repeat-x;
    background-position:  0% 95%;
}

@mixin text-selection($selection) {
    &::selection {
        @include text-underline-crop($selection);
    
        background: $selection;
    }

    &::-moz-selection {
        @include text-underline-crop($selection);
    
        background: $selection;
    }
}

@mixin link-underline($background, $text, $selection){
    @include text-underline-crop($background);
    @include text-background($background, $text);
    @include text-selection($selection);

    color: $text;
    text-decoration: none;

    *,
    *:after,
    &:after,
    *:before,
    &:before {
        text-shadow: none;
    }

    &:visited {
        color: $text;
    }
}
  </pre>
</article>
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CSS

            
              @mixin text-underline-crop($background) {
  text-shadow:  .03em 0 $background, 
                -.03em 0 $background,
                0 .03em $background,
                0 -.03em $background,
                .06em 0 $background,
                -.06em 0 $background,
                .09em 0 $background,
                -.09em 0 $background,
                .12em 0 $background,
                -.12em 0 $background,
                .15em 0 $background,
                -.15em 0 $background;
}

@mixin text-underline($color-bg, $color-text) {
  background-image: linear-gradient($color-text, $color-text);
  background-size: 1px 1px;
  background-repeat: repeat-x;
  background-position: 0% 95%;
}

@mixin text-selection($selection) {
  &::selection {
    @include text-underline-crop($selection);
    
    background: $selection;
  }

  &::-moz-selection {
    @include text-underline-crop($selection);
    
    background: $selection;
  }
}

@mixin link-underline($background, $text, $selection){
  @include text-underline-crop($background);
  @include text-underline($background, $text);
  @include text-selection($selection);

  color: $text;
  text-decoration: none;

  *,
  *:after,
  &:after,
  *:before,
  &:before {
    text-shadow: none;
  }

  &:visited {
    color: $text;
  }
}

$color-text:        #333332;
$color-background:  #fff;
$color-selection:   #b4d5fe;

body {
  font-family: freight-text-pro, georgia, serif;
  font-size: 18px;
  line-height: 1.4;
  margin: 20px;
}

pre {
  background-color: #eee;
  font-size: 16px;
  padding: 20px;  
}

.post a {
  @include link-underline($color-background, $color-text, $color-selection);
}
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JS
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