diff --git a/assets/js/nodeppt.js b/assets/js/nodeppt.js
index 95a9091fd..45fd9b2a1 100755
--- a/assets/js/nodeppt.js
+++ b/assets/js/nodeppt.js
@@ -353,7 +353,7 @@
                 '%, 0%)' : '';
             slide.style.animation = slide.style.webkitAnimation = slide.style.msAnimation = slide.style.mozAnimation = isOV ?
                 'none' : '';
-            Slide.fire(isOV ? 'overviewshow' : 'overviewhidden');
+            Slide.fire(isOV ? 'overviewshown' : 'overviewhidden');
         }
     }
 
diff --git a/assets/js/zoom.js b/assets/js/zoom.js
new file mode 100644
index 000000000..23f610b9c
--- /dev/null
+++ b/assets/js/zoom.js
@@ -0,0 +1,278 @@
+// Custom reveal.js integration
+(function() {
+    var isEnabled = true;
+
+    document.querySelector('slides').addEventListener('mousedown', function(event) {
+        var modifier = 'altKey';
+
+        var zoomPadding = 20;
+
+        if (event[modifier] && isEnabled) {
+            event.preventDefault();
+
+            var bounds = event.target.getBoundingClientRect();
+
+            zoom.to({
+                x: bounds.left - zoomPadding,
+                y: bounds.top - zoomPadding,
+                width: bounds.width + (zoomPadding * 2),
+                height: bounds.height + (zoomPadding * 2),
+                pan: false
+            });
+        }
+    });
+
+    Slide.on('overviewshown', function() {
+        isEnabled = false;
+    });
+    Slide.on('overviewhidden', function() {
+        isEnabled = true;
+    });
+})();
+
+/*!
+ * zoom.js 0.3 (modified for use with reveal.js)
+ * http://lab.hakim.se/zoom-js
+ * MIT licensed
+ *
+ * Copyright (C) 2011-2014 Hakim El Hattab, http://hakim.se
+ */
+var zoom = (function() {
+
+    // The current zoom level (scale)
+    var level = 1;
+
+    // The current mouse position, used for panning
+    var mouseX = 0,
+        mouseY = 0;
+
+    // Timeout before pan is activated
+    var panEngageTimeout = -1,
+        panUpdateInterval = -1;
+
+    // Check for transform support so that we can fallback otherwise
+    var supportsTransforms = 'WebkitTransform' in document.body.style || 'MozTransform' in document.body.style || 'msTransform' in document.body.style || 'OTransform' in document.body.style || 'transform' in document.body.style;
+
+    if (supportsTransforms) {
+        // The easing that will be applied when we zoom in/out
+        document.body.style.transition = 'transform 0.8s ease';
+        document.body.style.OTransition = '-o-transform 0.8s ease';
+        document.body.style.msTransition = '-ms-transform 0.8s ease';
+        document.body.style.MozTransition = '-moz-transform 0.8s ease';
+        document.body.style.WebkitTransition = '-webkit-transform 0.8s ease';
+    }
+
+    // Zoom out if the user hits escape
+    document.addEventListener('keyup', function(event) {
+        if (level !== 1 && event.keyCode === 27) {
+            zoom.out();
+        }
+    });
+
+    // Monitor mouse movement for panning
+    document.addEventListener('mousemove', function(event) {
+        if (level !== 1) {
+            mouseX = event.clientX;
+            mouseY = event.clientY;
+        }
+    });
+
+    /**
+     * Applies the CSS required to zoom in, prefers the use of CSS3
+     * transforms but falls back on zoom for IE.
+     *
+     * @param {Object} rect
+     * @param {Number} scale
+     */
+    function magnify(rect, scale) {
+
+        var scrollOffset = getScrollOffset();
+
+        // Ensure a width/height is set
+        rect.width = rect.width || 1;
+        rect.height = rect.height || 1;
+
+        // Center the rect within the zoomed viewport
+        rect.x -= (window.innerWidth - (rect.width * scale)) / 2;
+        rect.y -= (window.innerHeight - (rect.height * scale)) / 2;
+
+        if (supportsTransforms) {
+            // Reset
+            if (scale === 1) {
+                document.body.style.transform = '';
+                document.body.style.OTransform = '';
+                document.body.style.msTransform = '';
+                document.body.style.MozTransform = '';
+                document.body.style.WebkitTransform = '';
+            }
+            // Scale
+            else {
+                var origin = scrollOffset.x + 'px ' + scrollOffset.y + 'px',
+                    transform = 'translate(' + -rect.x + 'px,' + -rect.y + 'px) scale(' + scale + ')';
+
+                document.body.style.transformOrigin = origin;
+                document.body.style.OTransformOrigin = origin;
+                document.body.style.msTransformOrigin = origin;
+                document.body.style.MozTransformOrigin = origin;
+                document.body.style.WebkitTransformOrigin = origin;
+
+                document.body.style.transform = transform;
+                document.body.style.OTransform = transform;
+                document.body.style.msTransform = transform;
+                document.body.style.MozTransform = transform;
+                document.body.style.WebkitTransform = transform;
+            }
+        } else {
+            // Reset
+            if (scale === 1) {
+                document.body.style.position = '';
+                document.body.style.left = '';
+                document.body.style.top = '';
+                document.body.style.width = '';
+                document.body.style.height = '';
+                document.body.style.zoom = '';
+            }
+            // Scale
+            else {
+                document.body.style.position = 'relative';
+                document.body.style.left = (-(scrollOffset.x + rect.x) / scale) + 'px';
+                document.body.style.top = (-(scrollOffset.y + rect.y) / scale) + 'px';
+                document.body.style.width = (scale * 100) + '%';
+                document.body.style.height = (scale * 100) + '%';
+                document.body.style.zoom = scale;
+            }
+        }
+
+        level = scale;
+
+        if (document.documentElement.classList) {
+            if (level !== 1) {
+                document.documentElement.classList.add('zoomed');
+            } else {
+                document.documentElement.classList.remove('zoomed');
+            }
+        }
+    }
+
+    /**
+     * Pan the document when the mosue cursor approaches the edges
+     * of the window.
+     */
+    function pan() {
+        var range = 0.12,
+            rangeX = window.innerWidth * range,
+            rangeY = window.innerHeight * range,
+            scrollOffset = getScrollOffset();
+
+        // Up
+        if (mouseY < rangeY) {
+            window.scroll(scrollOffset.x, scrollOffset.y - (1 - (mouseY / rangeY)) * (14 / level));
+        }
+        // Down
+        else if (mouseY > window.innerHeight - rangeY) {
+            window.scroll(scrollOffset.x, scrollOffset.y + (1 - (window.innerHeight - mouseY) / rangeY) * (14 / level));
+        }
+
+        // Left
+        if (mouseX < rangeX) {
+            window.scroll(scrollOffset.x - (1 - (mouseX / rangeX)) * (14 / level), scrollOffset.y);
+        }
+        // Right
+        else if (mouseX > window.innerWidth - rangeX) {
+            window.scroll(scrollOffset.x + (1 - (window.innerWidth - mouseX) / rangeX) * (14 / level), scrollOffset.y);
+        }
+    }
+
+    function getScrollOffset() {
+        return {
+            x: window.scrollX !== undefined ? window.scrollX : window.pageXOffset,
+            y: window.scrollY !== undefined ? window.scrollY : window.pageYOffset
+        }
+    }
+
+    return {
+        /**
+         * Zooms in on either a rectangle or HTML element.
+         *
+         * @param {Object} options
+         *   - element: HTML element to zoom in on
+         *   OR
+         *   - x/y: coordinates in non-transformed space to zoom in on
+         *   - width/height: the portion of the screen to zoom in on
+         *   - scale: can be used instead of width/height to explicitly set scale
+         */
+        to: function(options) {
+
+            // Due to an implementation limitation we can't zoom in
+            // to another element without zooming out first
+            if (level !== 1) {
+                zoom.out();
+            } else {
+                options.x = options.x || 0;
+                options.y = options.y || 0;
+
+                // If an element is set, that takes precedence
+                if (!!options.element) {
+                    // Space around the zoomed in element to leave on screen
+                    var padding = 20;
+                    var bounds = options.element.getBoundingClientRect();
+
+                    options.x = bounds.left - padding;
+                    options.y = bounds.top - padding;
+                    options.width = bounds.width + (padding * 2);
+                    options.height = bounds.height + (padding * 2);
+                }
+
+                // If width/height values are set, calculate scale from those values
+                if (options.width !== undefined && options.height !== undefined) {
+                    options.scale = Math.max(Math.min(window.innerWidth / options.width, window.innerHeight / options.height), 1);
+                }
+
+                if (options.scale > 1) {
+                    options.x *= options.scale;
+                    options.y *= options.scale;
+
+                    magnify(options, options.scale);
+
+                    if (options.pan !== false) {
+
+                        // Wait with engaging panning as it may conflict with the
+                        // zoom transition
+                        panEngageTimeout = setTimeout(function() {
+                            panUpdateInterval = setInterval(pan, 1000 / 60);
+                        }, 800);
+
+                    }
+                }
+            }
+        },
+
+        /**
+         * Resets the document zoom state to its default.
+         */
+        out: function() {
+            clearTimeout(panEngageTimeout);
+            clearInterval(panUpdateInterval);
+
+            magnify({
+                x: 0,
+                y: 0
+            }, 1);
+
+            level = 1;
+        },
+
+        // Alias
+        magnify: function(options) {
+            this.to(options)
+        },
+        reset: function() {
+            this.out()
+        },
+
+        zoomLevel: function() {
+            return level;
+        }
+    }
+
+})();
diff --git a/package.json b/package.json
index bc58ddefb..a30ac8c61 100755
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "nodeppt",
   "jsname": "nodeppt",
   "description": "A simple, in-browser, markdown-driven presentation framework",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "site": "https://github.com/ksky521/nodePPT",
   "author": {
     "name": "Theo Wang",
diff --git a/ppts/demo.md b/ppts/demo.md
index 07694340b..2213e7160 100755
--- a/ppts/demo.md
+++ b/ppts/demo.md
@@ -2,7 +2,7 @@ title: nodeppt markdown 演示
 speaker: Theo Wang
 url: https://github.com/ksky521/nodePPT
 transition: move
-files: /js/demo.js,/css/demo.css
+files: /js/demo.js,/css/demo.css,/js/zoom.js
 
 [slide]