p 
  | 文字に
  strong マーカー
  | を引きます。
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strong {
  text-decoration: underline;
  text-decoration-thickness: 0.5em;
  text-decoration-color: yellow;
  text-underline-offset: -0.2em;
  text-decoration-skip-ink: none;
  padding: 0 2px;
}
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