HTML

filter htmlcollection

const existingElements = document.querySelectorAll(".chapter-list-item");

const chapters = Array.from(existingElements)
  .filter(chapter => !chapter.classList.contains("active"))

console.log("Found elements:")
for (const chapter of chapters) {
  console.log(chapter.textContent, chapter.className)
}

filter htmlcollection

const chapters = document.querySelectorAll(".chapter-list-item:not(.active)");

console.log("Found elements:")
for (const chapter of chapters) {
  console.log(chapter.textContent, chapter.className)
}