text: // ==UserScript==
  // @name        Foodpanda original price tag
  // @namespace   https://github.com/gslin/foodpanda-original-price-tag
  // @match       https://www.foodpanda.com.tw/*
  // @grant       none
  // @version     0.20210527.0
  // @author      Gea-Suan Lin <gslin@gslin.org>
  // @description Highlight original price tag for Foodpanda.
  // @license     MIT
  // ==/UserScript==
  
  (() => {
      'use strict';
  
      let style = 'background: yellow;';
  
      let ob = new window.MutationObserver(events => {
          events.forEach(ev => {
              ev.addedNodes.forEach(() => {
                  document.querySelectorAll('li.vendor-characteristic > span').forEach(el => {
                      if (el.innerText == '<店內價>') {
                          el.closest('figcaption').setAttribute('style', style);
                      }
                  });
              });
          });
      });
  
      ob.observe(document, {
          childList: true,
          subtree: true,
      });
  })();
  