CodePen Embed - vyvLww

<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Culpa sapiente, sequi sunt voluptas, architecto natus labore. Velit voluptates ratione porro, quo dolorum, facere tenetur laborum nihil dolores ad ipsam. Eligendi!</p>

.orange{
  background-color: orange;
}

var obj = document.querySelector("p"); // cible la balise a
obj.className = "orange"; // rajoute la classe orange au paragraphe

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