Modified from code at https://faq.oit.gatech.edu/content/how-can-i-embed-summary-status-wordpress-or-drupal-site
-- dead now, so archive.org link https://web.archive.org/web/20190915112715/https://faq.oit.gatech.edu/content/how-can-i-embed-summary-status-wordpress-or-drupal-site
ES6 fetch provides async / promise based JSON fetching
Note: will not work for IE11 https://caniuse.com/#search=fetch
CSS grid partial support in IE 10-11 https://caniuse.com/#search=grid