JSFiddle - React, Tailwind, and code Playground

HTML

<form>
  <input type="text" id="USPS_Tracking_Number" />
  <input type="button" value="Check USPS Tracking Number" onclick="goToPage();"/>
  <input type="reset" value="Reset">
</form>

JavaScript

function goToPage() {
  var url = document.querySelector("[type=\"text\"]").value
	window.open(url, "_blank", )
}