Hjjkk

 Jkklll

Kkllll

Mklll

<script>
function addLineNumbers() {
  const codeContentEl = document.getElementById('codeContent');
  const lineNumbersEl = document.getElementById('lineNumbers');

  const lines = codeContentEl.textContent.split("\n");
  lineNumbersEl.innerHTML = "";

  for(let i = 1; i <= lines.length; i++){
    const div = document.createElement("div");
    div.textContent = i;
    lineNumbersEl.appendChild(div);
  }
}

addLineNumbers();

const codeContentEl = document.getElementById('codeContent');
const lineNumbersEl = document.getElementById('lineNumbers');

// sync scroll
</script>

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