JSFiddle - React, Tailwind, and code Playground
HTML
<p id="test" title="1|2">test</p>
JavaScript
var lineBreak = $("<div>
</div>").html();
$("#test").attr("title", $("#test").attr("title").replace("|", lineBreak));
<p id="test" title="1|2">test</p>
var lineBreak = $("<div>
</div>").html();
$("#test").attr("title", $("#test").attr("title").replace("|", lineBreak));