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				@@ -481,9 +481,9 @@ if (typeof PDFJS === 'undefined') { 
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				   } 
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				 })(); 
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				-// TODO CanvasPixelArray is deprecated; use Uint8ClampedArray 
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				-// once it's supported. 
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				+// Support: IE<11, Chrome<21 
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				 (function checkSetPresenceInImageData() { 
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				+  // IE < 11 will use window.CanvasPixelArray which lacks set function. 
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				   if (window.CanvasPixelArray) { 
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				     if (typeof window.CanvasPixelArray.prototype.set !== 'function') { 
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				       window.CanvasPixelArray.prototype.set = function(arr) { 
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				@@ -492,6 +492,25 @@ if (typeof PDFJS === 'undefined') { 
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				         } 
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				       }; 
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				     } 
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				+  } else { 
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				+    // Chrome < 21 uses an inaccessible CanvasPixelArray prototype. 
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				+    // Because we cannot feature detect it, we rely on user agent. 
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				+    if (navigator.userAgent.indexOf('Chrom') >= 0) { 
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				+      var versionMatch = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./); 
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				+      if (versionMatch && parseInt(versionMatch[2]) < 21) { 
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				+        var contextPrototype = window.CanvasRenderingContext2D.prototype; 
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				+        contextPrototype._createImageData = contextPrototype.createImageData; 
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				+        contextPrototype.createImageData = function(w, h) { 
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				+          var imageData = this._createImageData(w, h); 
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				+          imageData.data.set = function(arr) { 
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				+            for (var i = 0, ii = this.length; i < ii; i++) { 
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				+              this[i] = arr[i]; 
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				+            } 
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				+          }; 
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				+          return imageData; 
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				+        }; 
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				+      } 
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				+    } 
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				   } 
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				 })(); 
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