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diff --git a/blockly/core/options.js b/blockly/core/options.js
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+/**
+ * @license
+ * Visual Blocks Editor
+ *
+ * Copyright 2016 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Object that controls settings for the workspace.
+ * @author fenichel@google.com (Rachel Fenichel)
+ */
+'use strict';
+
+goog.provide('Blockly.Options');
+
+
+/**
+ * Parse the user-specified options, using reasonable defaults where behaviour
+ * is unspecified.
+ * @param {!Object} options Dictionary of options.  Specification:
+ *   https://developers.google.com/blockly/guides/get-started/web#configuration
+ * @constructor
+ */
+Blockly.Options = function(options) {
+  var readOnly = !!options['readOnly'];
+  if (readOnly) {
+    var languageTree = null;
+    var hasCategories = false;
+    var hasTrashcan = false;
+    var hasCollapse = false;
+    var hasComments = false;
+    var hasDisable = false;
+    var hasSounds = false;
+  } else {
+    var languageTree = Blockly.Options.parseToolboxTree(options['toolbox']);
+    var hasCategories = Boolean(languageTree &&
+        languageTree.getElementsByTagName('category').length);
+    var hasTrashcan = options['trashcan'];
+    if (hasTrashcan === undefined) {
+      hasTrashcan = hasCategories;
+    }
+    var hasCollapse = options['collapse'];
+    if (hasCollapse === undefined) {
+      hasCollapse = hasCategories;
+    }
+    var hasComments = options['comments'];
+    if (hasComments === undefined) {
+      hasComments = hasCategories;
+    }
+    var hasDisable = options['disable'];
+    if (hasDisable === undefined) {
+      hasDisable = hasCategories;
+    }
+    var hasSounds = options['sounds'];
+    if (hasSounds === undefined) {
+      hasSounds = true;
+    }
+  }
+  var rtl = !!options['rtl'];
+  var horizontalLayout = options['horizontalLayout'];
+  if (horizontalLayout === undefined) {
+    horizontalLayout = false;
+  }
+  var toolboxAtStart = options['toolboxPosition'];
+  if (toolboxAtStart === 'end') {
+    toolboxAtStart = false;
+  } else {
+    toolboxAtStart = true;
+  }
+
+  if (horizontalLayout) {
+    var toolboxPosition = toolboxAtStart ?
+        Blockly.TOOLBOX_AT_TOP : Blockly.TOOLBOX_AT_BOTTOM;
+  } else {
+    var toolboxPosition = (toolboxAtStart == rtl) ?
+        Blockly.TOOLBOX_AT_RIGHT : Blockly.TOOLBOX_AT_LEFT;
+  }
+
+  var hasScrollbars = options['scrollbars'];
+  if (hasScrollbars === undefined) {
+    hasScrollbars = hasCategories;
+  }
+  var hasCss = options['css'];
+  if (hasCss === undefined) {
+    hasCss = true;
+  }
+  var pathToMedia = 'https://blockly-demo.appspot.com/static/media/';
+  if (options['media']) {
+    pathToMedia = options['media'];
+  } else if (options['path']) {
+    // 'path' is a deprecated option which has been replaced by 'media'.
+    pathToMedia = options['path'] + 'media/';
+  }
+
+  this.RTL = rtl;
+  this.collapse = hasCollapse;
+  this.comments = hasComments;
+  this.disable = hasDisable;
+  this.readOnly = readOnly;
+  this.maxBlocks = options['maxBlocks'] || Infinity;
+  this.pathToMedia = pathToMedia;
+  this.hasCategories = hasCategories;
+  this.hasScrollbars = hasScrollbars;
+  this.hasTrashcan = hasTrashcan;
+  this.hasSounds = hasSounds;
+  this.hasCss = hasCss;
+  this.horizontalLayout = horizontalLayout;
+  this.languageTree = languageTree;
+  this.gridOptions = Blockly.Options.parseGridOptions_(options);
+  this.zoomOptions = Blockly.Options.parseZoomOptions_(options);
+  this.toolboxPosition = toolboxPosition;
+};
+
+/**
+ * @type {Blockly.Workspace} the parent of the current workspace, or null if
+ *    there is no parent workspace.
+ **/
+Blockly.Options.prototype.parentWorkspace = null;
+
+/**
+ * If set, sets the translation of the workspace to match the scrollbars.
+ */
+Blockly.Options.prototype.setMetrics = null;
+
+/**
+ * Return an object with the metrics required to size the workspace.
+ * @return {Object} Contains size and position metrics, or null.
+ */
+Blockly.Options.prototype.getMetrics = null;
+
+/**
+ * Parse the user-specified zoom options, using reasonable defaults where
+ * behaviour is unspecified.  See zoom documentation:
+ *   https://developers.google.com/blockly/guides/configure/web/zoom
+ * @param {!Object} options Dictionary of options.
+ * @return {!Object} A dictionary of normalized options.
+ * @private
+ */
+Blockly.Options.parseZoomOptions_ = function(options) {
+  var zoom = options['zoom'] || {};
+  var zoomOptions = {};
+  if (zoom['controls'] === undefined) {
+    zoomOptions.controls = false;
+  } else {
+    zoomOptions.controls = !!zoom['controls'];
+  }
+  if (zoom['wheel'] === undefined) {
+    zoomOptions.wheel = false;
+  } else {
+    zoomOptions.wheel = !!zoom['wheel'];
+  }
+  if (zoom['startScale'] === undefined) {
+    zoomOptions.startScale = 1;
+  } else {
+    zoomOptions.startScale = parseFloat(zoom['startScale']);
+  }
+  if (zoom['maxScale'] === undefined) {
+    zoomOptions.maxScale = 3;
+  } else {
+    zoomOptions.maxScale = parseFloat(zoom['maxScale']);
+  }
+  if (zoom['minScale'] === undefined) {
+    zoomOptions.minScale = 0.3;
+  } else {
+    zoomOptions.minScale = parseFloat(zoom['minScale']);
+  }
+  if (zoom['scaleSpeed'] === undefined) {
+    zoomOptions.scaleSpeed = 1.2;
+  } else {
+    zoomOptions.scaleSpeed = parseFloat(zoom['scaleSpeed']);
+  }
+  return zoomOptions;
+};
+
+/**
+ * Parse the user-specified grid options, using reasonable defaults where
+ * behaviour is unspecified. See grid documentation:
+ *   https://developers.google.com/blockly/guides/configure/web/grid
+ * @param {!Object} options Dictionary of options.
+ * @return {!Object} A dictionary of normalized options.
+ * @private
+ */
+Blockly.Options.parseGridOptions_ = function(options) {
+  var grid = options['grid'] || {};
+  var gridOptions = {};
+  gridOptions.spacing = parseFloat(grid['spacing']) || 0;
+  gridOptions.colour = grid['colour'] || '#888';
+  gridOptions.length = parseFloat(grid['length']) || 1;
+  gridOptions.snap = gridOptions.spacing > 0 && !!grid['snap'];
+  return gridOptions;
+};
+
+/**
+ * Parse the provided toolbox tree into a consistent DOM format.
+ * @param {Node|string} tree DOM tree of blocks, or text representation of same.
+ * @return {Node} DOM tree of blocks, or null.
+ */
+Blockly.Options.parseToolboxTree = function(tree) {
+  if (tree) {
+    if (typeof tree != 'string') {
+      if (typeof XSLTProcessor == 'undefined' && tree.outerHTML) {
+        // In this case the tree will not have been properly built by the
+        // browser. The HTML will be contained in the element, but it will
+        // not have the proper DOM structure since the browser doesn't support
+        // XSLTProcessor (XML -> HTML). This is the case in IE 9+.
+        tree = tree.outerHTML;
+      } else if (!(tree instanceof Element)) {
+        tree = null;
+      }
+    }
+    if (typeof tree == 'string') {
+      tree = Blockly.Xml.textToDom(tree);
+    }
+  } else {
+    tree = null;
+  }
+  return tree;
+};