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We have an empty DOM element elem and a string text.

Which of these 3 commands will do exactly the same?

elem.append(document.createTextNode(text))
elem.innerHTML = text
elem.textContent = text

solution

Answer: 1 and 3.

Both commands result in adding the text as text into the elem.

Heres an example:

<div id="elem1"></div>
<div id="elem2"></div>
<div id="elem3"></div>
<script>
  let text = '<b>text</b>';

  elem1.append(document.createTextNode(text));
  elem2.innerHTML = text;
  elem3.textContent = text;
</script>

createTextNode vs innerHTML vs textContent