location='about:blank'; console.log(navigator.userAgent); console.log(Object.keys(window).sort());

bb.js

var page = require('webpage').create();
page.open('about:blank', function (status) {
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    return {
      'navigator.userAgent': navigator.userAgent,
      'Object.keys(window).sort()': Object.keys(window).sort()
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  });
  console.log(JSON.stringify(res));
  phantom.exit();
});

chrome33

"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.5 Safari/537.36"
["chrome", "document", "external", "location", "top", "window"]

firefox

"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0"
["InstallTrigger","console","constructor","document","external","getInterface","sidebar","window"]

IE11

"Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; MDDS; OfficeLiveConnector.1.5; OfficeLivePatch.1.3; .NET4.0C; .NET4.0E; rv:11.0) like Gecko"
["$","$$","__BROWSERTOOLS_CONSOLE","__BROWSERTOOLS_CONSOLE_BREAKMODE_FUNC","__BROWSERTOOLS_CONSOLE_SAFEFUNC","__BROWSERTOOLS_DOMEXPLORER_ADDED","cd","console","dir","select"]

opera12

"Opera/9.80 (Windows NT 6.1; Win64; x64; Edition Next) Presto/2.12.388 Version/12.15"
["Audio", "DOMParser", "Image", "Option", "SVGUnitTypes", "SVGZoomAndPan", "XMLHttpRequestUpload", "applicationCache", "closed", "console", "defaultStatus", "devicePixelRatio", "document", "event", "frameElement", "history", "innerHeight", "innerWidth", "localStorage", "location", "name", "navigator", "opener", "opera", "outerHeight", "outerWidth", "pageXOffset", "pageYOffset", "parent", "screen", "screenLeft", "screenTop", "screenX", "screenY", "scrollX", "scrollY", "self", "sessionStorage", "status", "top", "window"]

OPR20

"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1712.2 Safari/537.36 OPR/20.0.1346.0 (Edition Developer)"
["chrome","document","location","opr","top","window"]

phantomjs

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