Source code for https://formidable-masterminds.com/return-to-previous-page/

action-detail-page-return-link-source.html

<div class="return-to-codex-list">
  <a id="return_page_url" href="/action-list/"><i class="fad fa-arrow-alt-left"></i>Return to Actions List</a>
</div>

return-to-previous-page.js

<script>
jQuery(document).ready(function($) {
    "use strict";

    function getParameterByName(name, url) {
        if (!url) url = window.location.href;

        name = name.replace(/[\[\]]/g, "\\$&");

        var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
            results = regex.exec(url);

        if (!results) return null;

        if (!results[2]) return '';

        return decodeURIComponent(results[2].replace(/\+/g, " "));
    }

	$( function() {
		var referrer_url = window.document.referrer,
			this_url = window.location.href,
			about_page = getParameterByName("return_page", this_url);

		if ( ( referrer_url.indexOf("return_page") !== -1 && this_url.indexOf("return_page") ) || about_page == "about-the-codex" ) {
			if ( about_page !== "about-the-codex" ) {
				$( "a#return_page_url" ).prop( "href", referrer_url ).html('<i class="fad fa-arrow-alt-left"></i>Return to Previous Page');
			} else {
				$( "a#return_page_url" ).prop( "href", referrer_url ).html('<i class="fad fa-arrow-alt-left"></i>Return to About the Codex');
			}
		}
	});
});
</script>

wirking-code-without-text.html

$( "a#return_page_url" ).prop( "href", referrer_url );

working-code-with-text.html

$( "a#return_page_url" ).prop( "href", referrer_url ).html('<i class="fad fa-arrow-alt-left"></i>Return to Previous Page');