browsertime/browserscripts/pageinfo/documentWidth.js

Get performance metrics from your web page using Browsertime.

(function() {
  function docWidth(doc) {
    const body = doc.body,
      docelem = doc.documentElement;
    return Math.max(
      body.scrollWidth,
      body.offsetWidth,
      docelem.clientWidth,
      docelem.scrollWidth,
      docelem.offsetWidth
    );
  }

  return docWidth(document);
})();