With WooCommerce Booster Custom JS module you can add custom JavaScript code to your site’s frontend and/or backend.
For example, if you want to modify “Billing & Shipping” text on checkout with JavaScript, you can set “Custom JS – Front end (Customers)” option to:
jQuery(document).ready(function() {<br /> jQuery(“.woocommerce-checkout div.woocommerce-billing-fields h3”).text(“Billing”);<br /> });