<div>
  <a href="">属性を含まない要素は適用されない</a>
</div>
<div>
  <a href="">属性を含まない要素は適用されない</a>
</div>
<div>
  <a href="" target="_blank">属性を含む要素だけ適用</a>
</div>
a{
  color:black;
}
a[target] {
  color:blue;
}

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