diff --git a/.eslintrc.json b/.eslintrc.json
index 59510953..e3495e52 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,9 +1,33 @@
 {
+    "root": true,
+    "extends": [
+        "eslint:recommended"
+    ],
     "env": {
+        "es6": false,
         "browser": true
     },
-    "extends": "eslint:recommended",
+    "parserOptions": {
+        "ecmaVersion": 5,
+        "sourceType": "script",
+        "ecmaFeatures": {
+            "globalReturn": false,
+            "impliedStrict": false,
+            "jsx": false
+        }
+    },
+    "globals": {
+        "OpenSeadragon": true,
+        "define": false,
+        "module": false
+    },
     "rules": {
+        "no-unused-vars": [
+            "error",
+            {
+                "args": "none"
+            }
+        ],
         "indent": [
             "off",
             4
@@ -16,24 +40,18 @@
             "error",
             "always"
         ],
-        "no-unused-vars": [
-            "error",
-            {
-                "args": "none"
-            }
-        ],
         "block-scoped-var": [
             "error"
         ],
         "consistent-return": [
-            "off"
+            "error"
         ],
         "curly": [
             "error",
             "all"
         ],
         "eqeqeq": [
-            "off"
+            "error"
         ],
         "no-eval": [
             "error"
@@ -83,7 +101,7 @@
             "error"
         ],
         "no-useless-escape": [
-            "off"
+            "error"
         ],
         "no-useless-return": [
             "error"
@@ -103,7 +121,9 @@
         "no-use-before-define": [
             "error",
             {
-                "functions": false
+                "functions": false,
+                "classes": true,
+                "variables": true
             }
         ],
         "array-bracket-spacing": [
@@ -237,7 +257,7 @@
             "after"
         ],
         "quote-props": [
-            "off",
+            "error",
             "as-needed"
         ],
         "semi-spacing": [
@@ -273,10 +293,5 @@
         "no-loop-func": [
             "error"
         ]
-    },
-    "globals": {
-        "OpenSeadragon": true,
-        "define": false,
-        "module": false
     }
-}
+}
\ No newline at end of file
diff --git a/Gruntfile.js b/Gruntfile.js
index 26eaa038..e030188c 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -1,6 +1,8 @@
+/* eslint-disable no-redeclare */
 /* global module */
 
 module.exports = function(grunt) {
+    /* eslint-disable no-undef */
     var dateFormat = require('dateformat');
 
     // ----------
@@ -123,6 +125,7 @@ module.exports = function(grunt) {
                 banner: banner,
                 compress: {
                     sequences: false,
+                    /* eslint-disable camelcase */
                     join_vars: false
                 },
                 sourceMap: true,
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index 1a46d6a6..00000000
--- a/package-lock.json
+++ /dev/null
@@ -1,6400 +0,0 @@
-{
-  "name": "openseadragon",
-  "version": "2.4.2",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
-    "@babel/code-frame": {
-      "version": "7.5.5",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
-      "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
-      "dev": true,
-      "requires": {
-        "@babel/highlight": "^7.0.0"
-      }
-    },
-    "@babel/highlight": {
-      "version": "7.5.0",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
-      "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
-      "dev": true,
-      "requires": {
-        "chalk": "^2.0.0",
-        "esutils": "^2.0.2",
-        "js-tokens": "^4.0.0"
-      }
-    },
-    "abbrev": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
-      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
-      "dev": true
-    },
-    "accepts": {
-      "version": "1.3.7",
-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
-      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
-      "dev": true,
-      "requires": {
-        "mime-types": "~2.1.24",
-        "negotiator": "0.6.2"
-      }
-    },
-    "acorn": {
-      "version": "7.1.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.1.tgz",
-      "integrity": "sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==",
-      "dev": true
-    },
-    "acorn-jsx": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.1.0.tgz",
-      "integrity": "sha512-tMUqwBWfLFbJbizRmEcWSLw6HnFzfdJs2sOJEOwwtVPMoH/0Ay+E703oZz78VSXZiiDcZrQ5XKjPIUQixhmgVw==",
-      "dev": true
-    },
-    "agent-base": {
-      "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.3.0.tgz",
-      "integrity": "sha512-salcGninV0nPrwpGNn4VTXBb1SOuXQBiqbrNXoeizJsHrsL6ERFM2Ne3JUSBWRE6aeNJI2ROP/WEEIDUiDe3cg==",
-      "dev": true,
-      "requires": {
-        "es6-promisify": "^5.0.0"
-      }
-    },
-    "ajv": {
-      "version": "6.10.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
-      "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
-      "dev": true,
-      "requires": {
-        "fast-deep-equal": "^2.0.1",
-        "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.4.1",
-        "uri-js": "^4.2.2"
-      }
-    },
-    "amdefine": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
-      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
-      "dev": true,
-      "optional": true
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-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.0.tgz",
-      "integrity": "sha512-EiYhwo0v255HUL6eDyuLrXEkTi7WwVCLAw+SeOQ7M7qdun1z1pum4DEm/nuqIVbPvi9RPPc9k9LbyBv6H0DwVg==",
-      "dev": true,
-      "requires": {
-        "type-fest": "^0.8.1"
-      }
-    },
-    "ansi-regex": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-      "dev": true
-    },
-    "ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-      "dev": true
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-    "anymatch": {
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-      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-1.3.2.tgz",
-      "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
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-    "aproba": {
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-      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
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-              "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
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-              "dev": true
-            }
-          }
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-      "version": "1.3.0",
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-      "integrity": "sha1-oW0CXrkxvQO1LzCMrtD0D86+lTI=",
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-      "integrity": "sha512-EXy/zXb9kNHI07TIMz1oIUIrPZxQRA8aeJ5XYg5ihV8K4kD1DuA+FY6R96HfdIHzlSzS8HiISAfrm+vVQkZBug==",
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-        "inherits": "^2.0.1",
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-          "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
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-            "inherits": "~2.0.3",
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-          "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg==",
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-          "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
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-              "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
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-          "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
-          "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
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-      "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU=",
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-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/zip-stream/-/zip-stream-1.2.0.tgz",
-      "integrity": "sha1-qLxF9MG0lpnGuQGYuqyqzbzUugQ=",
-      "dev": true,
-      "requires": {
-        "archiver-utils": "^1.3.0",
-        "compress-commons": "^1.2.0",
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diff --git a/package.json b/package.json
index 06f429ac..54131a7e 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "url": "https://github.com/openseadragon/openseadragon.git"
   },
   "devDependencies": {
-    "grunt": "^1.0.4",
+    "grunt": "^1.1.0",
     "grunt-contrib-clean": "^2.0.0",
     "grunt-contrib-compress": "^1.6.0",
     "grunt-contrib-concat": "^1.0.1",
@@ -36,7 +36,7 @@
     "grunt-contrib-qunit": "^3.1.0",
     "grunt-contrib-uglify": "^4.0.1",
     "grunt-contrib-watch": "^1.1.0",
-    "grunt-eslint": "^22.0.0",
+    "grunt-eslint": "^23.0.0",
     "grunt-git-describe": "^2.4.4",
     "grunt-istanbul": "^0.8.0",
     "grunt-text-replace": "^0.4.0",
diff --git a/src/button.js b/src/button.js
index ac909933..7b00f9ee 100644
--- a/src/button.js
+++ b/src/button.js
@@ -158,7 +158,7 @@ $.Button = function( options ) {
         this.imgDown.style.visibility  =
             "hidden";
 
-        if ($.Browser.vendor == $.BROWSERS.FIREFOX && $.Browser.version < 3) {
+        if ($.Browser.vendor === $.BROWSERS.FIREFOX && $.Browser.version < 3) {
             this.imgGroup.style.top =
             this.imgHover.style.top =
             this.imgDown.style.top  =
@@ -465,13 +465,13 @@ function inTo( button, newState ) {
     }
 
     if ( newState >= $.ButtonState.GROUP &&
-         button.currentState == $.ButtonState.REST ) {
+         button.currentState === $.ButtonState.REST ) {
         stopFading( button );
         button.currentState = $.ButtonState.GROUP;
     }
 
     if ( newState >= $.ButtonState.HOVER &&
-         button.currentState == $.ButtonState.GROUP ) {
+         button.currentState === $.ButtonState.GROUP ) {
         if( button.imgHover ){
             button.imgHover.style.visibility = "";
         }
@@ -479,7 +479,7 @@ function inTo( button, newState ) {
     }
 
     if ( newState >= $.ButtonState.DOWN &&
-         button.currentState == $.ButtonState.HOVER ) {
+         button.currentState === $.ButtonState.HOVER ) {
         if( button.imgDown ){
             button.imgDown.style.visibility = "";
         }
@@ -495,7 +495,7 @@ function outTo( button, newState ) {
     }
 
     if ( newState <= $.ButtonState.HOVER &&
-         button.currentState == $.ButtonState.DOWN ) {
+         button.currentState === $.ButtonState.DOWN ) {
         if( button.imgDown ){
             button.imgDown.style.visibility = "hidden";
         }
@@ -503,7 +503,7 @@ function outTo( button, newState ) {
     }
 
     if ( newState <= $.ButtonState.GROUP &&
-         button.currentState == $.ButtonState.HOVER ) {
+         button.currentState === $.ButtonState.HOVER ) {
         if( button.imgHover ){
             button.imgHover.style.visibility = "hidden";
         }
@@ -511,7 +511,7 @@ function outTo( button, newState ) {
     }
 
     if ( newState <= $.ButtonState.REST &&
-         button.currentState == $.ButtonState.GROUP ) {
+         button.currentState === $.ButtonState.GROUP ) {
         beginFading( button );
         button.currentState = $.ButtonState.REST;
     }
diff --git a/src/control.js b/src/control.js
index d91e6b89..64f762d7 100644
--- a/src/control.js
+++ b/src/control.js
@@ -112,13 +112,13 @@ $.Control = function ( element, options, container ) {
      * @member {Element} wrapper
      * @memberof OpenSeadragon.Control#
      */
-    if ( this.anchor == $.ControlAnchor.ABSOLUTE ) {
+    if ( this.anchor === $.ControlAnchor.ABSOLUTE ) {
         this.wrapper    = $.makeNeutralElement( "div" );
         this.wrapper.style.position = "absolute";
-        this.wrapper.style.top = typeof (options.top) == "number" ? (options.top + 'px') : options.top;
-        this.wrapper.style.left  = typeof (options.left) == "number" ? (options.left + 'px') : options.left;
-        this.wrapper.style.height = typeof (options.height) == "number" ? (options.height + 'px') : options.height;
-        this.wrapper.style.width  = typeof (options.width) == "number" ? (options.width + 'px') : options.width;
+        this.wrapper.style.top = typeof (options.top) === "number" ? (options.top + 'px') : options.top;
+        this.wrapper.style.left  = typeof (options.left) === "number" ? (options.left + 'px') : options.left;
+        this.wrapper.style.height = typeof (options.height) === "number" ? (options.height + 'px') : options.height;
+        this.wrapper.style.width  = typeof (options.width) === "number" ? (options.width + 'px') : options.width;
         this.wrapper.style.margin = "0px";
         this.wrapper.style.padding = "0px";
 
@@ -130,7 +130,7 @@ $.Control = function ( element, options, container ) {
     } else {
         this.wrapper    = $.makeNeutralElement( "div" );
         this.wrapper.style.display = "inline-block";
-        if ( this.anchor == $.ControlAnchor.NONE ) {
+        if ( this.anchor === $.ControlAnchor.NONE ) {
             // IE6 fix
             this.wrapper.style.width = this.wrapper.style.height = "100%";
         }
@@ -138,8 +138,8 @@ $.Control = function ( element, options, container ) {
     this.wrapper.appendChild( this.element );
 
     if (options.attachToViewer ) {
-        if ( this.anchor == $.ControlAnchor.TOP_RIGHT ||
-             this.anchor == $.ControlAnchor.BOTTOM_RIGHT ) {
+        if ( this.anchor === $.ControlAnchor.TOP_RIGHT ||
+             this.anchor === $.ControlAnchor.BOTTOM_RIGHT ) {
             this.container.insertBefore(
                 this.wrapper,
                 this.container.firstChild
@@ -170,7 +170,7 @@ $.Control.prototype = {
      * @return {Boolean} true if currently visible, false otherwise.
      */
     isVisible: function() {
-        return this.wrapper.style.display != "none";
+        return this.wrapper.style.display !== "none";
     },
 
     /**
@@ -180,7 +180,7 @@ $.Control.prototype = {
      */
     setVisible: function( visible ) {
         this.wrapper.style.display = visible ?
-            ( this.anchor == $.ControlAnchor.ABSOLUTE ? 'block' : 'inline-block' ) :
+            ( this.anchor === $.ControlAnchor.ABSOLUTE ? 'block' : 'inline-block' ) :
             "none";
     },
 
@@ -190,7 +190,7 @@ $.Control.prototype = {
      * @param {Number} opactiy - a value between 1 and 0 inclusively.
      */
     setOpacity: function( opacity ) {
-        if ( this.element[ $.SIGNAL ] && $.Browser.vendor == $.BROWSERS.IE ) {
+        if ( this.element[ $.SIGNAL ] && $.Browser.vendor === $.BROWSERS.IE ) {
             $.setElementOpacity( this.element, opacity, true );
         } else {
             $.setElementOpacity( this.wrapper, opacity, true );
diff --git a/src/controldock.js b/src/controldock.js
index 81443bf9..9bc956c8 100644
--- a/src/controldock.js
+++ b/src/controldock.js
@@ -218,7 +218,7 @@
             i;
 
         for ( i = controls.length - 1; i >= 0; i-- ) {
-            if ( controls[ i ].element == element ) {
+            if ( controls[ i ].element === element ) {
                 return i;
             }
         }
diff --git a/src/drawer.js b/src/drawer.js
index db08fbee..31968224 100644
--- a/src/drawer.js
+++ b/src/drawer.js
@@ -284,8 +284,8 @@ $.Drawer.prototype = {
         this.canvas.innerHTML = "";
         if ( this.useCanvas ) {
             var viewportSize = this._calculateCanvasSize();
-            if( this.canvas.width != viewportSize.x ||
-                this.canvas.height != viewportSize.y ) {
+            if( this.canvas.width !== viewportSize.x ||
+                this.canvas.height !== viewportSize.y ) {
                 this.canvas.width = viewportSize.x;
                 this.canvas.height = viewportSize.y;
                 this._updateImageSmoothingEnabled(this.context);
diff --git a/src/dzitilesource.js b/src/dzitilesource.js
index 38d35b6c..f600a4d1 100644
--- a/src/dzitilesource.js
+++ b/src/dzitilesource.js
@@ -108,7 +108,7 @@ $.extend( $.DziTileSource.prototype, $.TileSource.prototype, /** @lends OpenSead
         if ( data.Image ) {
             ns = data.Image.xmlns;
         } else if ( data.documentElement) {
-            if ("Image" == data.documentElement.localName || "Image" == data.documentElement.tagName) {
+            if ("Image" === data.documentElement.localName || "Image" === data.documentElement.tagName) {
                 ns = data.documentElement.namespaceURI;
             }
         }
@@ -142,9 +142,9 @@ $.extend( $.DziTileSource.prototype, $.TileSource.prototype, /** @lends OpenSead
 
         if (url && !options.tilesUrl) {
             options.tilesUrl = url.replace(
-                    /([^\/]+?)(\.(dzi|xml|js)?(\?[^\/]*)?)?\/?$/, '$1_files/');
+                    /([^/]+?)(\.(dzi|xml|js)?(\?[^/]*)?)?\/?$/, '$1_files/');
 
-            if (url.search(/\.(dzi|xml|js)\?/) != -1) {
+            if (url.search(/\.(dzi|xml|js)\?/) !== -1) {
                 options.queryParams = url.match(/\?.*/);
             }else{
                 options.queryParams = '';
@@ -240,7 +240,7 @@ function configureFromXML( tileSource, xmlDoc ){
         sizeNode,
         i;
 
-    if ( rootName == "Image" ) {
+    if ( rootName === "Image" ) {
 
         try {
             sizeNode = root.getElementsByTagName("Size" )[ 0 ];
@@ -304,9 +304,9 @@ function configureFromXML( tileSource, xmlDoc ){
                 e :
                 new Error( $.getString("Errors.Dzi") );
         }
-    } else if ( rootName == "Collection" ) {
+    } else if ( rootName === "Collection" ) {
         throw new Error( $.getString( "Errors.Dzc" ) );
-    } else if ( rootName == "Error" ) {
+    } else if ( rootName === "Error" ) {
         var messageNode = root.getElementsByTagName("Message")[0];
         var message = messageNode.firstChild.nodeValue;
         throw new Error(message);
diff --git a/src/iiiftilesource.js b/src/iiiftilesource.js
index f5df16fb..1c0adc13 100644
--- a/src/iiiftilesource.js
+++ b/src/iiiftilesource.js
@@ -71,7 +71,7 @@ $.IIIFTileSource = function( options ){
         options.tileSize = this.tile_height;
     } else if ( this.tiles ) {
         // Version 2.0 forwards
-        if ( this.tiles.length == 1 ) {
+        if ( this.tiles.length === 1 ) {
             options.tileWidth  = this.tiles[0].width;
             // Use height if provided, otherwise assume square tiles and use width.
             options.tileHeight = this.tiles[0].height || this.tiles[0].width;
@@ -152,12 +152,12 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
 
     supports: function( data, url ) {
         // Version 2.0 and forwards
-        if (data.protocol && data.protocol == 'http://iiif.io/api/image') {
+        if (data.protocol && data.protocol === 'http://iiif.io/api/image') {
             return true;
         // Version 1.1
         } else if ( data['@context'] && (
-            data['@context'] == "http://library.stanford.edu/iiif/image-api/1.1/context.json" ||
-            data['@context'] == "http://iiif.io/api/image/1/context.json") ) {
+            data['@context'] === "http://library.stanford.edu/iiif/image-api/1.1/context.json" ||
+            data['@context'] === "http://iiif.io/api/image/1/context.json") ) {
             // N.B. the iiif.io context is wrong, but where the representation lives so likely to be used
             return true;
 
@@ -168,8 +168,8 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
         } else if ( data.identifier && data.width && data.height ) {
             return true;
         } else if ( data.documentElement &&
-            "info" == data.documentElement.tagName &&
-            "http://library.stanford.edu/iiif/image-api/ns/" ==
+            "info" === data.documentElement.tagName &&
+            "http://library.stanford.edu/iiif/image-api/ns/" ===
                 data.documentElement.namespaceURI) {
             return true;
 
@@ -500,7 +500,7 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
             rootName        = root.tagName,
             configuration   = null;
 
-        if ( rootName == "info" ) {
+        if ( rootName === "info" ) {
             try {
                 configuration = {};
                 parseXML10( root, configuration );
@@ -518,7 +518,7 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
     function parseXML10( node, configuration, property ) {
         var i,
             value;
-        if ( node.nodeType == 3 && property ) {//text node
+        if ( node.nodeType === 3 && property ) {//text node
             value = node.nodeValue.trim();
             if( value.match(/^\d*$/)){
                 value = Number( value );
@@ -531,7 +531,7 @@ $.extend( $.IIIFTileSource.prototype, $.TileSource.prototype, /** @lends OpenSea
                 }
                 configuration[ property ].push( value );
             }
-        } else if( node.nodeType == 1 ){
+        } else if( node.nodeType === 1 ){
             for( i = 0; i < node.childNodes.length; i++ ){
                 parseXML10( node.childNodes[ i ], configuration, node.nodeName );
             }
diff --git a/src/legacytilesource.js b/src/legacytilesource.js
index 67572346..c1c5e253 100644
--- a/src/legacytilesource.js
+++ b/src/legacytilesource.js
@@ -109,10 +109,10 @@ $.extend( $.LegacyTileSource.prototype, $.TileSource.prototype, /** @lends OpenS
     supports: function( data, url ){
         return (
             data.type &&
-            "legacy-image-pyramid" == data.type
+            "legacy-image-pyramid" === data.type
         ) || (
             data.documentElement &&
-            "legacy-image-pyramid" == data.documentElement.getAttribute('type')
+            "legacy-image-pyramid" === data.documentElement.getAttribute('type')
         );
     },
 
@@ -241,7 +241,7 @@ function configureFromXML( tileSource, xmlDoc ){
         level,
         i;
 
-    if ( rootName == "image" ) {
+    if ( rootName === "image" ) {
 
         try {
             conf = {
@@ -267,9 +267,9 @@ function configureFromXML( tileSource, xmlDoc ){
                 e :
                 new Error( 'Unknown error parsing Legacy Image Pyramid XML.' );
         }
-    } else if ( rootName == "collection" ) {
+    } else if ( rootName === "collection" ) {
         throw new Error( 'Legacy Image Pyramid Collections not yet supported.' );
-    } else if ( rootName == "error" ) {
+    } else if ( rootName === "error" ) {
         throw new Error( 'Error: ' + xmlDoc );
     }
 
diff --git a/src/mousetracker.js b/src/mousetracker.js
index 050e6cc3..d1b584ae 100644
--- a/src/mousetracker.js
+++ b/src/mousetracker.js
@@ -997,7 +997,7 @@
     /**
      * Detect available mouse wheel event name.
      */
-    $.MouseTracker.wheelEventName = ( $.Browser.vendor == $.BROWSERS.IE && $.Browser.version > 8 ) ||
+    $.MouseTracker.wheelEventName = ( $.Browser.vendor === $.BROWSERS.IE && $.Browser.version > 8 ) ||
                                                 ( 'onwheel' in document.createElement( 'div' ) ) ? 'wheel' : // Modern browsers support 'wheel'
                                     document.onmousewheel !== undefined ? 'mousewheel' :                     // Webkit and IE support at least 'mousewheel'
                                     'DOMMouseScroll';                                                        // Assume old Firefox
@@ -1015,7 +1015,7 @@
      */
     $.MouseTracker.subscribeEvents = [ "click", "dblclick", "keydown", "keyup", "keypress", "focus", "blur", $.MouseTracker.wheelEventName ];
 
-    if( $.MouseTracker.wheelEventName == "DOMMouseScroll" ) {
+    if( $.MouseTracker.wheelEventName === "DOMMouseScroll" ) {
         // Older Firefox
         $.MouseTracker.subscribeEvents.push( "MozMousePixelScroll" );
     }
@@ -1760,13 +1760,13 @@
             clientY:    event.clientY,
             pageX:      event.pageX ? event.pageX : event.clientX,
             pageY:      event.pageY ? event.pageY : event.clientY,
-            deltaMode:  event.type == "MozMousePixelScroll" ? 0 : 1, // 0=pixel, 1=line, 2=page
+            deltaMode:  event.type === "MozMousePixelScroll" ? 0 : 1, // 0=pixel, 1=line, 2=page
             deltaX:     0,
             deltaZ:     0
         };
 
         // Calculate deltaY
-        if ( $.MouseTracker.wheelEventName == "mousewheel" ) {
+        if ( $.MouseTracker.wheelEventName === "mousewheel" ) {
             simulatedEvent.deltaY = -event.wheelDelta / $.DEFAULT_SETTINGS.pixelsPerWheelLine;
         } else {
             simulatedEvent.deltaY = event.detail;
@@ -3284,7 +3284,7 @@
             // Pinch
             if ( tracker.pinchHandler && gPoints[ 0 ].type === 'touch' ) {
                 delta = delegate.pinchGPoints[ 0 ].currentPos.distanceTo( delegate.pinchGPoints[ 1 ].currentPos );
-                if ( delta != delegate.currentPinchDist ) {
+                if ( delta !== delegate.currentPinchDist ) {
                     delegate.lastPinchDist = delegate.currentPinchDist;
                     delegate.currentPinchDist = delta;
                     delegate.lastPinchCenter = delegate.currentPinchCenter;
diff --git a/src/navigator.js b/src/navigator.js
index 6ff112e0..f0bdf452 100644
--- a/src/navigator.js
+++ b/src/navigator.js
@@ -66,15 +66,15 @@ $.Navigator = function( options ){
         };
 
         if( options.position ){
-            if( 'BOTTOM_RIGHT' == options.position ){
+            if( 'BOTTOM_RIGHT' === options.position ){
                options.controlOptions.anchor = $.ControlAnchor.BOTTOM_RIGHT;
-            } else if( 'BOTTOM_LEFT' == options.position ){
+            } else if( 'BOTTOM_LEFT' === options.position ){
                options.controlOptions.anchor = $.ControlAnchor.BOTTOM_LEFT;
-            } else if( 'TOP_RIGHT' == options.position ){
+            } else if( 'TOP_RIGHT' === options.position ){
                options.controlOptions.anchor = $.ControlAnchor.TOP_RIGHT;
-            } else if( 'TOP_LEFT' == options.position ){
+            } else if( 'TOP_LEFT' === options.position ){
                options.controlOptions.anchor = $.ControlAnchor.TOP_LEFT;
-            } else if( 'ABSOLUTE' == options.position ){
+            } else if( 'ABSOLUTE' === options.position ){
                options.controlOptions.anchor = $.ControlAnchor.ABSOLUTE;
                options.controlOptions.top = options.top;
                options.controlOptions.left = options.left;
@@ -128,7 +128,7 @@ $.Navigator = function( options ){
     this.totalBorderWidths = new $.Point(this.borderWidth * 2, this.borderWidth * 2).minus(this.fudge);
 
 
-    if ( options.controlOptions.anchor != $.ControlAnchor.NONE ) {
+    if ( options.controlOptions.anchor !== $.ControlAnchor.NONE ) {
         (function( style, borderWidth ){
             style.margin        = '0px';
             style.border        = borderWidth + 'px solid ' + options.borderColor;
@@ -179,8 +179,8 @@ $.Navigator = function( options ){
         options.controlOptions
     );
 
-    this._resizeWithViewer = options.controlOptions.anchor != $.ControlAnchor.ABSOLUTE &&
-        options.controlOptions.anchor != $.ControlAnchor.NONE;
+    this._resizeWithViewer = options.controlOptions.anchor !== $.ControlAnchor.ABSOLUTE &&
+        options.controlOptions.anchor !== $.ControlAnchor.NONE;
 
     if (options.width && options.height) {
         this.setWidth(options.width);
@@ -282,7 +282,7 @@ $.extend( $.Navigator.prototype, $.EventSource.prototype, $.Viewer.prototype, /*
      */
     setWidth: function(width) {
         this.width = width;
-        this.element.style.width = typeof (width) == "number" ? (width + 'px') : width;
+        this.element.style.width = typeof (width) === "number" ? (width + 'px') : width;
         this._resizeWithViewer = false;
     },
 
@@ -292,7 +292,7 @@ $.extend( $.Navigator.prototype, $.EventSource.prototype, $.Viewer.prototype, /*
      */
     setHeight: function(height) {
         this.height = height;
-        this.element.style.height = typeof (height) == "number" ? (height + 'px') : height;
+        this.element.style.height = typeof (height) === "number" ? (height + 'px') : height;
         this._resizeWithViewer = false;
     },
 
diff --git a/src/openseadragon.js b/src/openseadragon.js
index ac15ac9f..f035c436 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -1333,7 +1333,7 @@ function OpenSeadragon( options ){
          * @returns {Element} The element with the given id, null, or the element itself.
          */
         getElement: function( element ) {
-            if ( typeof ( element ) == "string" ) {
+            if ( typeof ( element ) === "string" ) {
                 element = document.getElementById( element );
             }
             return element;
@@ -1352,7 +1352,7 @@ function OpenSeadragon( options ){
                 offsetParent;
 
             element      = $.getElement( element );
-            isFixed      = $.getElementStyle( element ).position == "fixed";
+            isFixed      = $.getElementStyle( element ).position === "fixed";
             offsetParent = getOffsetParent( element, isFixed );
 
             while ( offsetParent ) {
@@ -1365,7 +1365,7 @@ function OpenSeadragon( options ){
                 }
 
                 element = offsetParent;
-                isFixed = $.getElementStyle( element ).position == "fixed";
+                isFixed = $.getElementStyle( element ).position === "fixed";
                 offsetParent = getOffsetParent( element, isFixed );
             }
 
@@ -1397,7 +1397,7 @@ function OpenSeadragon( options ){
                 boundingRect = element.getBoundingClientRect();
             }
 
-            win = ( doc == doc.window ) ?
+            win = ( doc === doc.window ) ?
                 doc :
                 ( doc.nodeType === 9 ) ?
                     doc.defaultView || doc.parentWindow :
@@ -1548,7 +1548,7 @@ function OpenSeadragon( options ){
          */
         getMousePosition: function( event ) {
 
-            if ( typeof ( event.pageX ) == "number" ) {
+            if ( typeof ( event.pageX ) === "number" ) {
                 $.getMousePosition = function( event ){
                     var result = new $.Point();
 
@@ -1558,7 +1558,7 @@ function OpenSeadragon( options ){
 
                     return result;
                 };
-            } else if ( typeof ( event.clientX ) == "number" ) {
+            } else if ( typeof ( event.clientX ) === "number" ) {
                 $.getMousePosition = function( event ){
                     var result = new $.Point();
 
@@ -1593,7 +1593,7 @@ function OpenSeadragon( options ){
             var docElement  = document.documentElement || {},
                 body        = document.body || {};
 
-            if ( typeof ( window.pageXOffset ) == "number" ) {
+            if ( typeof ( window.pageXOffset ) === "number" ) {
                 $.getPageScroll = function(){
                     return new $.Point(
                         window.pageXOffset,
@@ -1670,7 +1670,7 @@ function OpenSeadragon( options ){
                 };
             }
 
-            return $.setPageScroll( scroll );
+            $.setPageScroll( scroll );
         },
 
         /**
@@ -1682,7 +1682,7 @@ function OpenSeadragon( options ){
             var docElement = document.documentElement || {},
                 body    = document.body || {};
 
-            if ( typeof ( window.innerWidth ) == 'number' ) {
+            if ( typeof ( window.innerWidth ) === 'number' ) {
                 $.getWindowSize = function(){
                     return new $.Point(
                         window.innerWidth,
@@ -1814,7 +1814,7 @@ function OpenSeadragon( options ){
                 return img;
             };
 
-            if ( $.Browser.vendor == $.BROWSERS.IE && $.Browser.version < 7 ) {
+            if ( $.Browser.vendor === $.BROWSERS.IE && $.Browser.version < 7 ) {
 
                 $.makeTransparentImage = function( src ){
                     var img     = $.makeNeutralElement( "img" ),
@@ -2227,7 +2227,7 @@ function OpenSeadragon( options ){
 
             request.onreadystatechange = function() {
                 // 4 = DONE (https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest#Properties)
-                if ( request.readyState == 4 ) {
+                if ( request.readyState === 4 ) {
                     request.onreadystatechange = function(){};
 
                     // With protocols other than http/https, a successful request status is in
@@ -2281,8 +2281,8 @@ function OpenSeadragon( options ){
                     to point developers in the right direction. We test the exception number because IE's
                     error messages are localized.
                 */
-                var oldIE = $.Browser.vendor == $.BROWSERS.IE && $.Browser.version < 10;
-                if ( oldIE && typeof ( e.number ) != "undefined" && e.number == -2147024891 ) {
+                var oldIE = $.Browser.vendor === $.BROWSERS.IE && $.Browser.version < 10;
+                if ( oldIE && typeof ( e.number ) !== "undefined" && e.number === -2147024891 ) {
                     msg += "\nSee http://msdn.microsoft.com/en-us/library/ms537505(v=vs.85).aspx#xdomain";
                 }
 
@@ -2353,7 +2353,7 @@ function OpenSeadragon( options ){
                 callbackParam = options.param || 'callback',
                 callback      = options.callback;
 
-            url = url.replace( /(\=)\?(&|$)|\?\?/i, replace );
+            url = url.replace( /(=)\?(&|$)|\?\?/i, replace );
             // Add callback manually
             url += (/\?/.test( url ) ? "&" : "?") + callbackParam + "=" + jsonpCallback;
 
@@ -2534,12 +2534,12 @@ function OpenSeadragon( options ){
 
 
     var FILEFORMATS = {
-            "bmp":  false,
-            "jpeg": true,
-            "jpg":  true,
-            "png":  true,
-            "tif":  false,
-            "wdp":  false
+            bmp:  false,
+            jpeg: true,
+            jpg:  true,
+            png:  true,
+            tif:  false,
+            wdp:  false
         },
         URLPARAMS = {};
 
@@ -2624,17 +2624,17 @@ function OpenSeadragon( options ){
         //determine if this browser supports image alpha transparency
         $.Browser.alpha = !(
             (
-                $.Browser.vendor == $.BROWSERS.IE &&
+                $.Browser.vendor === $.BROWSERS.IE &&
                 $.Browser.version < 9
             ) || (
-                $.Browser.vendor == $.BROWSERS.CHROME &&
+                $.Browser.vendor === $.BROWSERS.CHROME &&
                 $.Browser.version < 2
             )
         );
 
         //determine if this browser supports element.style.opacity
         $.Browser.opacity = !(
-            $.Browser.vendor == $.BROWSERS.IE &&
+            $.Browser.vendor === $.BROWSERS.IE &&
             $.Browser.version < 9
         );
 
@@ -2736,7 +2736,7 @@ function OpenSeadragon( options ){
      * @returns {Element}
      */
     function getOffsetParent( element, isFixed ) {
-        if ( isFixed && element != document.body ) {
+        if ( isFixed && element !== document.body ) {
             return document.body;
         } else {
             return element.offsetParent;
diff --git a/src/osmtilesource.js b/src/osmtilesource.js
index 555e0a9f..c28945bb 100644
--- a/src/osmtilesource.js
+++ b/src/osmtilesource.js
@@ -113,7 +113,7 @@ $.extend( $.OsmTileSource.prototype, $.TileSource.prototype, /** @lends OpenSead
     supports: function( data, url ){
         return (
             data.type &&
-            "openstreetmaps" == data.type
+            "openstreetmaps" === data.type
         );
     },
 
diff --git a/src/point.js b/src/point.js
index 7e55ec53..be7ff6d3 100644
--- a/src/point.js
+++ b/src/point.js
@@ -50,13 +50,13 @@ $.Point = function( x, y ) {
      * @member {Number} x
      * @memberof OpenSeadragon.Point#
      */
-    this.x = typeof ( x ) == "number" ? x : 0;
+    this.x = typeof ( x ) === "number" ? x : 0;
     /**
      * The vector component 'y'.
      * @member {Number} y
      * @memberof OpenSeadragon.Point#
      */
-    this.y = typeof ( y ) == "number" ? y : 0;
+    this.y = typeof ( y ) === "number" ? y : 0;
 };
 
 /** @lends OpenSeadragon.Point.prototype */
diff --git a/src/referencestrip.js b/src/referencestrip.js
index 49530b7a..31340e43 100644
--- a/src/referencestrip.js
+++ b/src/referencestrip.js
@@ -98,7 +98,7 @@ $.ReferenceStrip = function ( options ) {
     $.extend( this, options );
     //Private state properties
     THIS[this.id] = {
-        "animating":           false
+        animating:           false
     };
 
     this.minPixelRatio = this.viewer.minPixelRatio;
@@ -139,7 +139,7 @@ $.ReferenceStrip = function ( options ) {
             { anchor: $.ControlAnchor.BOTTOM_LEFT }
         );
     } else {
-        if ( "horizontal" == options.scroll ) {
+        if ( "horizontal" === options.scroll ) {
             this.element.style.width = (
                 viewerSize.x *
                 options.sizeRatio *
@@ -225,7 +225,7 @@ $.ReferenceStrip = function ( options ) {
         this.panels.push( element );
 
     }
-    loadPanels( this, this.scroll == 'vertical' ? viewerSize.y : viewerSize.x, 0 );
+    loadPanels( this, this.scroll === 'vertical' ? viewerSize.y : viewerSize.x, 0 );
     this.setFocus( 0 );
 
 };
@@ -251,7 +251,7 @@ $.extend( $.ReferenceStrip.prototype, $.EventSource.prototype, $.Viewer.prototyp
             this.currentSelected = element;
             this.currentSelected.style.background = '#999';
 
-            if ( 'horizontal' == this.scroll ) {
+            if ( 'horizontal' === this.scroll ) {
                 //right left
                 offset = ( Number( page ) ) * ( this.panelWidth + 3 );
                 if ( offset > offsetLeft + viewerSize.x - this.panelWidth ) {
@@ -324,7 +324,7 @@ function onStripDrag( event ) {
         viewerSize   = $.getElementSize( this.viewer.canvas );
     this.dragging = true;
     if ( this.element ) {
-        if ( 'horizontal' == this.scroll ) {
+        if ( 'horizontal' === this.scroll ) {
             if ( -event.delta.x > 0 ) {
                 //forward
                 if ( offsetLeft > -( scrollWidth - viewerSize.x ) ) {
@@ -372,7 +372,7 @@ function onStripScroll( event ) {
         scrollHeight = Number( this.element.style.height.replace( 'px', '' ) ),
         viewerSize   = $.getElementSize( this.viewer.canvas );
     if ( this.element ) {
-        if ( 'horizontal' == this.scroll ) {
+        if ( 'horizontal' === this.scroll ) {
             if ( event.scroll > 0 ) {
                 //forward
                 if ( offsetLeft > -( scrollWidth - viewerSize.x ) ) {
@@ -415,7 +415,7 @@ function loadPanels( strip, viewerSize, scroll ) {
         style,
         i,
         element;
-    if ( 'horizontal' == strip.scroll ) {
+    if ( 'horizontal' === strip.scroll ) {
         panelSize = strip.panelWidth;
     } else {
         panelSize = strip.panelHeight;
@@ -504,7 +504,7 @@ function onStripEnter( event ) {
     //element.style.border = '1px solid #555';
     //element.style.background = '#000';
 
-    if ( 'horizontal' == this.scroll ) {
+    if ( 'horizontal' === this.scroll ) {
 
         //element.style.paddingTop = "0px";
         element.style.marginBottom = "0px";
@@ -527,7 +527,7 @@ function onStripEnter( event ) {
 function onStripExit( event ) {
     var element = event.eventSource.element;
 
-    if ( 'horizontal' == this.scroll ) {
+    if ( 'horizontal' === this.scroll ) {
 
         //element.style.paddingTop = "10px";
         element.style.marginBottom = "-" + ( $.getElementSize( element ).y / 2 ) + "px";
diff --git a/src/spring.js b/src/spring.js
index 9c314b9f..8aa17b84 100644
--- a/src/spring.js
+++ b/src/spring.js
@@ -50,11 +50,11 @@
 $.Spring = function( options ) {
     var args = arguments;
 
-    if( typeof ( options ) != 'object' ){
+    if( typeof ( options ) !== 'object' ){
         //allows backward compatible use of ( initialValue, config ) as
         //constructor parameters
         options = {
-            initial: args.length && typeof ( args[ 0 ] ) == "number" ?
+            initial: args.length && typeof ( args[ 0 ] ) === "number" ?
                 args[ 0 ] :
                 undefined,
             /**
@@ -96,7 +96,7 @@ $.Spring = function( options ) {
      * @property {Number} time
      */
     this.current = {
-        value: typeof ( this.initial ) == "number" ?
+        value: typeof ( this.initial ) === "number" ?
             this.initial :
             (this._exponential ? 0 : 1),
         time:  $.now() // always work in milliseconds
@@ -237,7 +237,7 @@ $.Spring.prototype = {
             this.current.value = currentValue;
         }
 
-        return oldValue != this.current.value;
+        return oldValue !== this.current.value;
     },
 
     /**
diff --git a/src/strings.js b/src/strings.js
index 7d0cbdd1..bf960cf9 100644
--- a/src/strings.js
+++ b/src/strings.js
@@ -82,7 +82,7 @@ $.extend( $, /** @lends OpenSeadragon */{
         }
         string = container[ props[ i ] ];
 
-        if ( typeof ( string ) != "string" ) {
+        if ( typeof ( string ) !== "string" ) {
             $.console.log( "Untranslated source string:", prop );
             string = ""; // FIXME: this breaks gettext()-style convention, which would return source
         }
diff --git a/src/tile.js b/src/tile.js
index aca41e1c..1ea7c5d9 100644
--- a/src/tile.js
+++ b/src/tile.js
@@ -284,10 +284,10 @@ $.Tile.prototype = {
             this.style                     = this.element.style;
             this.style.position            = "absolute";
         }
-        if ( this.element.parentNode != container ) {
+        if ( this.element.parentNode !== container ) {
             container.appendChild( this.element );
         }
-        if ( this.imgElement.parentNode != this.element ) {
+        if ( this.imgElement.parentNode !== this.element ) {
             this.element.appendChild( this.imgElement );
         }
 
diff --git a/src/tilecache.js b/src/tilecache.js
index 05d4e9cd..b0745eb1 100644
--- a/src/tilecache.js
+++ b/src/tilecache.js
@@ -196,7 +196,7 @@ $.TileCache.prototype = {
                 worstLevel  = worstTile.level;
 
                 if ( prevTime < worstTime ||
-                   ( prevTime == worstTime && prevLevel > worstLevel ) ) {
+                   ( prevTime === worstTime && prevLevel > worstLevel ) ) {
                     worstTile       = prevTile;
                     worstTileIndex  = i;
                     worstTileRecord = prevTileRecord;
diff --git a/src/tiledimage.js b/src/tiledimage.js
index 368c06c5..74ffacef 100644
--- a/src/tiledimage.js
+++ b/src/tiledimage.js
@@ -1874,7 +1874,7 @@ function compareTiles( previousBest, tile ) {
 
     if ( tile.visibility > previousBest.visibility ) {
         return tile;
-    } else if ( tile.visibility == previousBest.visibility ) {
+    } else if ( tile.visibility === previousBest.visibility ) {
         if ( tile.squaredDistance < previousBest.squaredDistance ) {
             return tile;
         }
diff --git a/src/tilesource.js b/src/tilesource.js
index d85f5ee6..2f50374c 100644
--- a/src/tilesource.js
+++ b/src/tilesource.js
@@ -167,7 +167,7 @@ $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLeve
      * @memberof OpenSeadragon.TileSource#
      */
 
-    if( 'string' == $.type( arguments[ 0 ] ) ){
+    if( 'string' === $.type( arguments[ 0 ] ) ){
         this.url = arguments[0];
     }
 
@@ -500,7 +500,7 @@ $.TileSource.prototype = {
                         msg = "HTTP " + xhr.status + " attempting to load TileSource";
                     } catch ( e ) {
                         var formattedExc;
-                        if ( typeof ( exc ) == "undefined" || !exc.toString ) {
+                        if ( typeof ( exc ) === "undefined" || !exc.toString ) {
                             formattedExc = "Unknown error";
                         } else {
                             formattedExc = exc.toString();
@@ -640,7 +640,7 @@ function processResponse( xhr ){
         throw new Error( $.getString( "Errors.Security" ) );
     } else if ( xhr.status !== 200 && xhr.status !== 0 ) {
         status     = xhr.status;
-        statusText = ( status == 404 ) ?
+        statusText = ( status === 404 ) ?
             "Not Found" :
             xhr.statusText;
         throw new Error( $.getString( "Errors.Status", status, statusText ) );
@@ -654,6 +654,7 @@ function processResponse( xhr ){
         } catch (e){
             data = xhr.responseText;
         }
+    /* eslint-disable no-useless-escape */
     }else if( responseText.match(/\s*[\{\[].*/) ){
         try{
           data = $.parseJSON(responseText);
@@ -690,6 +691,8 @@ $.TileSource.determineType = function( tileSource, data, url ){
     }
 
     $.console.error( "No TileSource was able to open %s %s", url, data );
+
+    return null;
 };
 
 
diff --git a/src/tmstilesource.js b/src/tmstilesource.js
index 66b7755c..abb8f2db 100644
--- a/src/tmstilesource.js
+++ b/src/tmstilesource.js
@@ -103,7 +103,7 @@ $.extend( $.TmsTileSource.prototype, $.TileSource.prototype, /** @lends OpenSead
      * @param {String} optional - url
      */
     supports: function( data, url ){
-        return ( data.type && "tiledmapservice" == data.type );
+        return ( data.type && "tiledmapservice" === data.type );
     },
 
     /**
diff --git a/src/viewer.js b/src/viewer.js
index 73b2aca4..1e5486e7 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -200,19 +200,19 @@ $.Viewer = function( options ) {
 
     //Private state properties
     THIS[ this.hash ] = {
-        "fsBoundsDelta":     new $.Point( 1, 1 ),
-        "prevContainerSize": null,
-        "animating":         false,
-        "forceRedraw":       false,
-        "mouseInside":       false,
-        "group":             null,
+        fsBoundsDelta:     new $.Point( 1, 1 ),
+        prevContainerSize: null,
+        animating:         false,
+        forceRedraw:       false,
+        mouseInside:       false,
+        group:             null,
         // whether we should be continuously zooming
-        "zooming":           false,
+        zooming:           false,
         // how much we should be continuously zooming by
-        "zoomFactor":        null,
-        "lastZoomTime":      null,
-        "fullPage":          false,
-        "onfullscreenchange": null
+        zoomFactor:        null,
+        lastZoomTime:      null,
+        fullPage:          false,
+        onfullscreenchange: null
     };
 
     this._sequenceIndex = 0;
@@ -521,7 +521,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
         this.close();
 
         if (!tileSources) {
-            return;
+            return this;
         }
 
         if (this.sequenceMode && $.isArray(tileSources)) {
@@ -530,7 +530,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
                 this.referenceStrip = null;
             }
 
-            if (typeof initialPage != 'undefined' && !isNaN(initialPage)) {
+            if (typeof initialPage !== 'undefined' && !isNaN(initialPage)) {
               this.initialPage = initialPage;
             }
 
@@ -545,7 +545,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
             }
 
             this._updateSequenceButtons( this._sequenceIndex );
-            return;
+            return this;
         }
 
         if (!$.isArray(tileSources)) {
@@ -553,7 +553,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
         }
 
         if (!tileSources.length) {
-            return;
+            return this;
         }
 
         this._opening = true;
@@ -931,7 +931,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
             i;
 
         //don't bother modifying the DOM if we are already in full page mode.
-        if ( fullPage == this.isFullPage() ) {
+        if ( fullPage === this.isFullPage() ) {
             return this;
         }
 
@@ -1225,7 +1225,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
      * @return {Boolean}
      */
     isVisible: function () {
-        return this.container.style.visibility != "hidden";
+        return this.container.style.visibility !== "hidden";
     },
 
 
@@ -1429,7 +1429,7 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
 
                 if (queueItem.options.replace) {
                     var newIndex = _this.world.getIndexOfItem(queueItem.options.replaceItem);
-                    if (newIndex != -1) {
+                    if (newIndex !== -1) {
                         queueItem.options.index = newIndex;
                     }
                     _this.world.removeItem(queueItem.options.replaceItem);
@@ -2283,11 +2283,12 @@ function getTileSourceImplementation( viewer, tileSource, imgOptions, successCal
     var _this = viewer;
 
     //allow plain xml strings or json strings to be parsed here
-    if ( $.type( tileSource ) == 'string' ) {
+    if ( $.type( tileSource ) === 'string' ) {
         //xml should start with "<" and end with ">"
         if ( tileSource.match( /^\s*<.*>\s*$/ ) ) {
             tileSource = $.parseXml( tileSource );
         //json should start with "{" or "[" and end with "}" or "]"
+        /* eslint-disable no-useless-escape */
         } else if ( tileSource.match(/^\s*[\{\[].*[\}\]]\s*$/ ) ) {
             try {
               var tileSourceJ = $.parseJSON(tileSource);
@@ -2315,7 +2316,7 @@ function getTileSourceImplementation( viewer, tileSource, imgOptions, successCal
     }
 
     setTimeout( function() {
-        if ( $.type( tileSource ) == 'string' ) {
+        if ( $.type( tileSource ) === 'string' ) {
             //If its still a string it means it must be a url at this point
             tileSource = new $.TileSource({
                 url: tileSource,
@@ -2690,7 +2691,7 @@ function onCanvasKeyPress( event ) {
 function onCanvasClick( event ) {
     var gestureSettings;
 
-    var haveKeyboardFocus = document.activeElement == this.canvas;
+    var haveKeyboardFocus = document.activeElement === this.canvas;
 
     // If we don't have keyboard focus, request it.
     if ( !haveKeyboardFocus ) {
@@ -2834,11 +2835,11 @@ function onCanvasDrag( event ) {
             this.viewport.centerSpringX.target.value -= delta.x;
             this.viewport.centerSpringY.target.value -= delta.y;
 
-            if (bounds.x != constrainedBounds.x) {
+            if (bounds.x !== constrainedBounds.x) {
                 event.delta.x = 0;
             }
 
-            if (bounds.y != constrainedBounds.y) {
+            if (bounds.y !== constrainedBounds.y) {
                 event.delta.y = 0;
             }
         }
@@ -2927,7 +2928,7 @@ function onCanvasEnter( event ) {
 
 function onCanvasExit( event ) {
 
-    if (window.location != window.parent.location){
+    if (window.location !== window.parent.location){
         $.MouseTracker.resetAllMouseTrackers();
     }
 
@@ -3193,6 +3194,8 @@ function onCanvasScroll( event ) {
             return false;   // We are swallowing this event
         }
     }
+
+    return true;
 }
 
 function onContainerEnter( event ) {
diff --git a/src/viewport.js b/src/viewport.js
index 43011914..513d02fb 100644
--- a/src/viewport.js
+++ b/src/viewport.js
@@ -898,7 +898,7 @@ $.Viewport.prototype = {
          * @property {Number} degrees - The number of degrees the rotation was set to.
          * @property {?Object} userData - Arbitrary subscriber-defined object.
          */
-        this.viewer.raiseEvent('rotate', {"degrees": degrees});
+        this.viewer.raiseEvent('rotate', {degrees: degrees});
         return this;
     },
 
@@ -1567,7 +1567,7 @@ $.Viewport.prototype = {
        * @property {Number} flipped - The flip state after this change.
        * @property {?Object} userData - Arbitrary subscriber-defined object.
        */
-      this.viewer.raiseEvent('flip', {"flipped": state});
+      this.viewer.raiseEvent('flip', {flipped: state});
       return this;
     }
 
diff --git a/src/zoomifytilesource.js b/src/zoomifytilesource.js
index 6009d0c1..743c2c1b 100644
--- a/src/zoomifytilesource.js
+++ b/src/zoomifytilesource.js
@@ -107,7 +107,7 @@
          * @param {String} optional - url
          */
         supports: function(data, url) {
-            return (data.type && "zoomifytileservice" == data.type);
+            return (data.type && "zoomifytileservice" === data.type);
         },
 
         /**