  Viewer.DEFAULTS = {
    // Enable inline mode
    inline: false,

    // Show the button on the top-right of the viewer
    button: true,

    // Show the navbar
    navbar: true,

    // Show the title
    title: true,

    // Show the toolbar
    toolbar: true,

    // Show the tooltip with image ratio (percentage) when zoom in or zoom out
    tooltip: true,

    // Enable to move the image
    movable: true,

    // Enable to zoom the image
    zoomable: true,

    // Enable to rotate the image
    rotatable: true,

    // Enable to scale the image
    scalable: true,

    // Enable CSS3 Transition for some special elements
    transition: true,

    // Enable to request fullscreen when play
    fullscreen: true,

    // Enable keyboard support
    keyboard: true,

    // Define interval of each image when playing
    interval: 5000,

    // Min width of the viewer in inline mode
    minWidth: 200,

    // Min height of the viewer in inline mode
    minHeight: 100,

    // Define the ratio when zoom the image by wheeling mouse
    zoomRatio: 0.1,

    // Define the min ratio of the image when zoom out
    minZoomRatio: 0.01,

    // Define the max ratio of the image when zoom in
    maxZoomRatio: 100,

    // Define the CSS `z-index` value of viewer in modal mode.
    zIndex: 2015,

    // Define the CSS `z-index` value of viewer in inline mode.
    zIndexInline: 0,

    // Define where to get the original image URL for viewing
    // Type: String (an image attribute) or Function (should return an image URL)
    url: 'src',

    // Event shortcuts
    build: null,
    built: null,
    show: null,
    shown: null,
    hide: null,
    hidden: null
  };
