JavaScript How to add line break in downloaded text file using js

please try with below example, as you are passing data in the form of url you have to encode new line characters which will make it work and another thing is you are trying to download as text so change content type to "text/plain"

 function download() {
        var a = document.body.appendChild(
            document.createElement("a")
        );
        var textToWrite = document.getElementById("show-data").innerText;
        a.download = "export.txt"; 
        textToWrite = textToWrite.replace(/\n/g, "%0D%0A"); 
        a.href = "data:text/plain," + textToWrite;
        a.click();
    }
  <div id="show-data">
<p>one</p>
<p>two</p>
<p>Three</p>
</div>
    <button onClick="download()">Download</button>
Answer:1

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