JSFiddle - React, Tailwind, and code Playground

by dexterity

HTML

<li id="listItem">
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    <span id="firstSpan">First span text</span>
    <span id="secondSpan">Second span text</span>
</li>
<input id="input" style="width: 300px; margin-top: 10px;">

JavaScript

$("#input").val($("#listItem").clone().find("span").remove().end().text().trim());