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var img = new Image();
var attrs = ['alt', 'crossOrigin', 'height', 'isMap', 'sizes', 'src', 'srcset', 'useMap', 'width'];
for (attribute in img) {
  if (attrs.indexOf(attribute) !== -1) {
    console.log(attribute);
  }
}

// WebKit states suport for the image sizes attribute is complete. Safari 9.x does not show this support.