Simple check RWD

gistfile1.js

var phantom = require('phantom');
const fs = require('fs');

const widthTag = 'width=device-width';
const mediaTag = 'media';
//const mediaTag = 'media screen and (';

async function parseSite(url) {
  const instance = await phantom.create(['--ignore-ssl-errors=yes']);
  const page = await instance.createPage();
  page.setting('userAgent',"Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1");

  await page.on('onResourceRequested', function(requestData,request) {

  });
  console.log(url);

  const status = await page.open(url);
  let html = await page.evaluate(function() {
    return document;
  })
  var fwidthTag,fmediaTag = false;
  let str = JSON.stringify(html);
  if(str.includes(widthTag) ) {
    fwidthTag = true;
  }
  if(str.includes(mediaTag)) {
    fmediaTag = true;
  }

  // Array.prototype.slice.apply(html.styleSheets).forEach(function(styleSheet) {
  //     if(styleSheet!=null){
  //
  //         for(var i=0;i<styleSheet.rules.length;i++) {
  //             var cssText = styleSheet.rules[i].cssText
  //             if(content.includes(widthTag) && content.includes(mediaTag)) {
  //               found = true;
  //             }
  //
  //         }
  //     }
  // });
  var result = url+' '+fwidthTag+ " "+ fmediaTag+"\n";
  await instance.exit();

  return result;

};

(async function() {
    let siteList = fs.readFileSync('list.txt','utf8').split('\n');
    for(var i=0;i<siteList.length;i++){
        const url = siteList[i];
        let res = await parseSite(url);
        fs.appendFileSync('./out.txt',res,'utf8');
    }


})();