Re-implement phantom's examples/features.js in puppeteer api.

examples/features.js

@@ -0,0 +1,56 @@
+/**
+ * Copyright 2017 Google Inc. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+var path = require('path');
+var Browser = require('../lib/Browser');
+var browser = new Browser();
+
+browser.newPage().then(async page => {
+    var modernizrPath = path.join('..', 'third_party', 'phantomjs', 'examples', 'modernizr.js');
+    await page.injectFile(modernizrPath);
+    page.on('Page.Events.ConsoleMessageAdded', console.log);
+    await page.evaluate(detectFeatures);
+    browser.close();
+});
+
+function detectFeatures() {
+    var supported = [], unsupported = [];
+    console.log('Detected features (using Modernizr ' + Modernizr._version + '):');
+    for (var feature in Modernizr) {
+        if (Modernizr.hasOwnProperty(feature)) {
+            if (feature[0] !== '_' && typeof Modernizr[feature] !== 'function' &&
+                feature !== 'input' && feature !== 'inputtypes') {
+                if (Modernizr[feature]) {
+                    supported.push(feature);
+                } else {
+                    unsupported.push(feature);
+                }
+            }
+        }
+    }
+
+    console.log('');
+    console.log('Supported:');
+    supported.forEach(function (e) {
+        console.log('  ' + e);
+    });
+
+    console.log('');
+    console.log('Not supported:');
+    unsupported.forEach(function (e) {
+        console.log('  ' + e);
+    });
+}