<div class="box">
  <h2>Add span element</h2>
  <ul>
    <li><span>🐜</span>Item1</li>
    <li><span>🦅</span>Item2</li>
    <li><span>🐞</span>Item3</li>
    <li><span>🦋</span>Item4</li>
    <li><span>🐿</span>Item5</li>
  </ul>
</div>

<div class="box">
  <h2>data-* attributes and pseudo element</h2>
  <ul>
    <li data-emoji="🐜">Item1</li>
    <li data-emoji="🦅">Item2</li>
    <li data-emoji="🐞">Item3</li>
    <li data-emoji="🦋">Item4</li>
    <li data-emoji="🐿">Item5</li>
  </ul>
</div>

<div class="box">
  <h2>pseudo element</h2>
  <ul>
    <li>Item1</li>
    <li>Item2</li>
    <li>Item3</li>
    <li>Item4</li>
    <li>Item5</li>
  </ul>
</div>
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100vw;
  min-height: 100vh;
  display: flex;
  justify-content: space-around;
  align-items: flex-start;
  padding: 2vw;
}

.box {
  border: 1px solid #eee;
  border-radius: 5px;
  box-shadow: 0 0 3px rgba(0,0,0,.15);
  min-width: 20vw;
  
  h2 {
    text-align: center;
    border-bottom: 1px solid #eee;
    padding: 10px 15px;
    font-size: 1rem;
  }
  
  li {
    list-style: none;
    padding: 10px 20px;
    
    &:nth-child(even) {
      background-color: #efeefe;
    }
  }
}

.box:nth-child(1) span {
  font-size: 1.5em;
  margin-right: 5px;
}

.box:nth-child(2) li::before {
  content: attr(data-emoji);
  display: inline-block;
  font-size: 1.5em;
  margin-right: 5px;
}

$emojis: 🐜,🦅,🐞,🦋,🐿;

.box:nth-child(3) {
  @for $i from 1 through length($emojis) {
    li:nth-child(#{$i})::before {
      content:"#{nth($emojis, $i)}";
      display: inline-block;
      font-size: 1.5em;
      margin-right: 5px;
    }
  }
}
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