diff --git a/src/display/api.js b/src/display/api.js
index e2cb8c9a7..ed5865714 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -503,8 +503,7 @@ var PDFPageProxy = (function PDFPageProxyClosure() {
       // this call to render.
       this.pendingDestroy = false;
 
-      var renderingIntent = ('intent' in params ?
-        (params.intent == 'print' ? 'print' : 'display') : 'display');
+      var renderingIntent = (params.intent === 'print' ? 'print' : 'display');
 
       if (!this.intentStates[renderingIntent]) {
         this.intentStates[renderingIntent] = {};
@@ -1003,7 +1002,7 @@ var WorkerTransport = (function WorkerTransportClosure() {
       messageHandler.on('JpegDecode', function(data) {
         var imageUrl = data[0];
         var components = data[1];
-        if (components != 3 && components != 1) {
+        if (components !== 3 && components !== 1) {
           return Promise.reject(
             new Error('Only 3 components or 1 component can be returned'));
         }
@@ -1022,13 +1021,13 @@ var WorkerTransport = (function WorkerTransportClosure() {
             var data = tmpCtx.getImageData(0, 0, width, height).data;
             var i, j;
 
-            if (components == 3) {
+            if (components === 3) {
               for (i = 0, j = 0; i < rgbaLength; i += 4, j += 3) {
                 buf[j] = data[i];
                 buf[j + 1] = data[i + 1];
                 buf[j + 2] = data[i + 2];
               }
-            } else if (components == 1) {
+            } else if (components === 1) {
               for (i = 0, j = 0; i < rgbaLength; i += 4, j++) {
                 buf[j] = data[i];
               }
diff --git a/src/display/canvas.js b/src/display/canvas.js
index aa4971227..3f1fa7643 100644
--- a/src/display/canvas.js
+++ b/src/display/canvas.js
@@ -1227,7 +1227,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
       // the current transformation matrix before the fillText/strokeText.
       // See https://bugzilla.mozilla.org/show_bug.cgi?id=726227
       var browserFontSize = size >= MIN_FONT_SIZE ? size : MIN_FONT_SIZE;
-      this.current.fontSizeScale = browserFontSize != MIN_FONT_SIZE ? 1.0 :
+      this.current.fontSizeScale = browserFontSize !== MIN_FONT_SIZE ? 1.0 :
                                    size / MIN_FONT_SIZE;
 
       var rule = italic + ' ' + bold + ' ' + browserFontSize + 'px ' + typeface;
@@ -1373,7 +1373,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
         lineWidth /= scale;
       }
 
-      if (fontSizeScale != 1.0) {
+      if (fontSizeScale !== 1.0) {
         ctx.scale(fontSizeScale, fontSizeScale);
         lineWidth /= fontSizeScale;
       }
diff --git a/src/display/metadata.js b/src/display/metadata.js
index 575026f49..8a5e80397 100644
--- a/src/display/metadata.js
+++ b/src/display/metadata.js
@@ -28,8 +28,8 @@ var Metadata = PDFJS.Metadata = (function MetadataClosure() {
       var chars = '';
       for (var i = 0; i < bytes.length; i += 2) {
         var code = bytes.charCodeAt(i) * 256 + bytes.charCodeAt(i + 1);
-        chars += code >= 32 && code < 127 && code != 60 && code != 62 &&
-          code != 38 && false ? String.fromCharCode(code) :
+        chars += code >= 32 && code < 127 && code !== 60 && code !== 62 &&
+          code !== 38 && false ? String.fromCharCode(code) :
           '&#x' + (0x10000 + code).toString(16).substring(1) + ';';
       }
       return '>' + chars;
diff --git a/src/display/pattern_helper.js b/src/display/pattern_helper.js
index 574edf57e..f6305e69f 100644
--- a/src/display/pattern_helper.js
+++ b/src/display/pattern_helper.js
@@ -382,7 +382,7 @@ var TilingPattern = (function TilingPatternClosure() {
     },
 
     clipBbox: function clipBbox(graphics, bbox, x0, y0, x1, y1) {
-      if (bbox && isArray(bbox) && 4 == bbox.length) {
+      if (bbox && isArray(bbox) && bbox.length === 4) {
         var bboxWidth = x1 - x0;
         var bboxHeight = y1 - y0;
         graphics.ctx.rect(x0, y0, bboxWidth, bboxHeight);
diff --git a/src/display/svg.js b/src/display/svg.js
index 6431ebf02..0522f1c11 100644
--- a/src/display/svg.js
+++ b/src/display/svg.js
@@ -162,7 +162,7 @@ var SVGGraphics = (function SVGGraphicsClosure(ctx) {
 
       var self = this;
       for (var i = 0; i < fnArrayLen; i++) {
-        if (OPS.dependency == fnArray[i]) {
+        if (OPS.dependency === fnArray[i]) {
           var deps = argsArray[i];
           for (var n = 0, nn = deps.length; n < nn; n++) {
             var obj = deps[n];
@@ -652,7 +652,7 @@ var SVGGraphics = (function SVGGraphicsClosure(ctx) {
       this.clippath = document.createElementNS(NS, 'svg:clipPath');
       this.clippath.setAttributeNS(null, 'id', current.clipId);
       var clipElement = current.element.cloneNode();
-      if (type == 'evenodd') {
+      if (type === 'evenodd') {
         clipElement.setAttributeNS(null, 'clip-rule', 'evenodd');
       } else {
         clipElement.setAttributeNS(null, 'clip-rule', 'nonzero');