Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components-chromium/polymer/polymer-extracted.js

Index: third_party/polymer/v1_0/components-chromium/polymer/polymer-extracted.js
diff --git a/third_party/polymer/v1_0/components-chromium/polymer/polymer-extracted.js b/third_party/polymer/v1_0/components-chromium/polymer/polymer-extracted.js
index efa86c507b5db26e50bd18dae8cfde6a9577a1c8..ad5ce0a9ac00037d97bf8ed06ff6abfb6bbcb5b7 100644
--- a/third_party/polymer/v1_0/components-chromium/polymer/polymer-extracted.js
+++ b/third_party/polymer/v1_0/components-chromium/polymer/polymer-extracted.js
@@ -36,6 +36,9 @@ var annote = {
 bindings: [],
 events: []
 };
+if (element.localName === 'content') {
+list._hasContent = true;
+}
 this._parseChildNodesAnnotations(element, annote, list);
 if (element.attributes) {
 this._parseNodeAttributeAnnotations(element, annote, list);
@@ -54,6 +57,14 @@ for (var i = 0, node = root.firstChild; node; node = node.nextSibling, i++) {
 if (node.localName === 'template' && !node.hasAttribute('preserve-content')) {
 this._parseTemplate(node, i, list, annote);
 }
+if (node.nodeType === Node.TEXT_NODE) {
+var n = node.nextSibling;
+while (n && n.nodeType === Node.TEXT_NODE) {
+node.textContent += n.textContent;
+root.removeChild(n);
+n = n.nextSibling;
+}
+}
 var childAnnotation = this._parseNodeAnnotations(node, list, callback);
 if (childAnnotation) {
 childAnnotation.parent = annote;
@@ -163,6 +174,9 @@ at.value = a === 'style' ? resolveCss(v, ownerDocument) : resolve(v, ownerDocume
 }
 }
 function resolve(url, ownerDocument) {
+if (url && url[0] === '#') {
+return url;
+}
 var resolver = getUrlResolver(ownerDocument);
 resolver.href = url;
 return resolver.href || url;
@@ -323,18 +337,57 @@ this.listen(node, name, listeners[key]);
 listen: function (node, eventName, methodName) {
 this._listen(node, eventName, this._createEventHandler(node, eventName, methodName));
 },
+_boundListenerKey: function (eventName, methodName) {
+return eventName + ':' + methodName;
+},
+_recordEventHandler: function (host, eventName, target, methodName, handler) {
+var hbl = host.__boundListeners;
+if (!hbl) {
+hbl = host.__boundListeners = new WeakMap();
+}
+var bl = hbl.get(target);
+if (!bl) {
+bl = {};
+hbl.set(target, bl);
+}
+var key = this._boundListenerKey(eventName, methodName);
+bl[key] = handler;
+},
+_recallEventHandler: function (host, eventName, target, methodName) {
+var hbl = host.__boundListeners;
+if (!hbl) {
+return;
+}
+var bl = hbl.get(target);
+if (!bl) {
+return;
+}
+var key = this._boundListenerKey(eventName, methodName);
+return bl[key];
+},
 _createEventHandler: function (node, eventName, methodName) {
 var host = this;
-return function (e) {
+var handler = function (e) {
 if (host[methodName]) {
 host[methodName](e, e.detail);
 } else {
 host._warn(host._logf('_createEventHandler', 'listener method `' + methodName + '` not defined'));
 }
 };
+this._recordEventHandler(host, eventName, node, methodName, handler);
+return handler;
+},
+unlisten: function (node, eventName, methodName) {
+var handler = this._recallEventHandler(this, eventName, node, methodName);
+if (handler) {
+this._unlisten(node, eventName, handler);
+}
 },
 _listen: function (node, eventName, handler) {
 node.addEventListener(eventName, handler);
+},
+_unlisten: function (node, eventName, handler) {
+node.removeEventListener(eventName, handler);
 }
 });
 (function () {
@@ -353,6 +406,7 @@ var MOUSE_EVENTS = [
 'mouseup',
 'click'
 ];
+var IS_TOUCH_ONLY = navigator.userAgent.match(/iP(?:[oa]d|hone)|Android/);
 var mouseCanceller = function (mouseEvent) {
 mouseEvent[HANDLED_OBJ] = { skip: true };
 if (mouseEvent.type === 'click') {
@@ -377,6 +431,9 @@ document.removeEventListener(en, mouseCanceller, true);
 }
 }
 function ignoreMouse() {
+if (IS_TOUCH_ONLY) {
+return;
+}
 if (!POINTERSTATE.mouse.mouseIgnoreJob) {
 setupTeardownMouseCanceller(true);
 }
@@ -388,7 +445,6 @@ POINTERSTATE.mouse.mouseIgnoreJob = null;
 POINTERSTATE.mouse.mouseIgnoreJob = Polymer.Debounce(POINTERSTATE.mouse.mouseIgnoreJob, unset, MOUSE_TIMEOUT);
 }
 var POINTERSTATE = {
-tapPrevented: false,
 mouse: {
 target: null,
 mouseIgnoreJob: null
@@ -426,6 +482,12 @@ node = next;
 }
 return node;
 },
+findOriginalTarget: function (ev) {
+if (ev.path) {
+return ev.path[0];
+}
+return ev.target;
+},
 handleNative: function (ev) {
 var handled;
 var type = ev.type;
@@ -510,24 +572,62 @@ node[GESTURE_KEY] = gobj = {};
 }
 for (var i = 0, dep, gd; i < deps.length; i++) {
 dep = deps[i];
+if (IS_TOUCH_ONLY && MOUSE_EVENTS.indexOf(dep) > -1) {
+continue;
+}
 gd = gobj[dep];
 if (!gd) {
-gobj[dep] = gd = {};
+gobj[dep] = gd = { _count: 0 };
+}
+if (gd._count === 0) {
 node.addEventListener(dep, this.handleNative);
 }
 gd[name] = (gd[name] || 0) + 1;
+gd._count = (gd._count || 0) + 1;
 }
 node.addEventListener(evType, handler);
 if (recognizer.touchAction) {
 this.setTouchAction(node, recognizer.touchAction);
 }
 },
+remove: function (node, evType, handler) {
+var recognizer = this.gestures[evType];
+var deps = recognizer.deps;
+var name = recognizer.name;
+var gobj = node[GESTURE_KEY];
+if (gobj) {
+for (var i = 0, dep, gd; i < deps.length; i++) {
+dep = deps[i];
+gd = gobj[dep];
+if (gd && gd[name]) {
+gd[name] = (gd[name] || 1) - 1;
+gd._count = (gd._count || 1) - 1;
+}
+if (gd._count === 0) {
+node.removeEventListener(dep, this.handleNative);
+}
+}
+}
+node.removeEventListener(evType, handler);
+},
 register: function (recog) {
 this.recognizers.push(recog);
 for (var i = 0; i < recog.emits.length; i++) {
 this.gestures[recog.emits[i]] = recog;
 }
 },
+findRecognizerByEvent: function (evName) {
+for (var i = 0, r; i < this.recognizers.length; i++) {
+r = this.recognizers[i];
+for (var j = 0, n; j < r.emits.length; j++) {
+n = r.emits[j];
+if (n === evName) {
+return r;
+}
+}
+}
+return null;
+},
 setTouchAction: function (node, value) {
 if (HAS_NATIVE_TA) {
 node.style.touchAction = value;
@@ -535,12 +635,23 @@ node.style.touchAction = value;
 node[TOUCH_ACTION] = value;
 },
 fire: function (target, type, detail) {
-var ev = new CustomEvent(type, {
-detail: detail,
+var ev = Polymer.Base.fire(type, detail, {
+node: target,
 bubbles: true,
 cancelable: true
 });
-target.dispatchEvent(ev);
+if (ev.defaultPrevented) {
+var se = detail.sourceEvent;
+if (se && se.preventDefault) {
+se.preventDefault();
+}
+}
+},
+prevent: function (evName) {
+var recognizer = this.findRecognizerByEvent(evName);
+if (recognizer.info) {
+recognizer.info.prevent = true;
+}
 }
 };
 Gestures.register({
@@ -555,7 +666,7 @@ emits: [
 'up'
 ],
 mousedown: function (e) {
-var t = e.currentTarget;
+var t = Gestures.findOriginalTarget(e);
 var self = this;
 var upfn = function upfn(e) {
 self.fire('up', t, e);
@@ -565,16 +676,18 @@ document.addEventListener('mouseup', upfn);
 this.fire('down', t, e);
 },
 touchstart: function (e) {
-this.fire('down', e.currentTarget, e.changedTouches[0]);
+this.fire('down', Gestures.findOriginalTarget(e), e.changedTouches[0]);
 },
 touchend: function (e) {
-this.fire('up', e.currentTarget, e.changedTouches[0]);
+this.fire('up', Gestures.findOriginalTarget(e), e.changedTouches[0]);
 },
 fire: function (type, target, event) {
+var self = this;
 Gestures.fire(target, type, {
 x: event.clientX,
 y: event.clientY,
-sourceEvent: event
+sourceEvent: event,
+prevent: Gestures.prevent.bind(Gestures)
 });
 }
 });
@@ -599,7 +712,8 @@ if (this.moves.length > TRACK_LENGTH) {
 this.moves.shift();
 }
 this.moves.push(move);
-}
+},
+prevent: false
 },
 clearInfo: function () {
 this.info.state = 'start';
@@ -607,8 +721,12 @@ this.info.started = false;
 this.info.moves = [];
 this.info.x = 0;
 this.info.y = 0;
+this.info.prevent = false;
 },
 hasMovedEnough: function (x, y) {
+if (this.info.prevent) {
+return false;
+}
 if (this.info.started) {
 return true;
 }
@@ -617,7 +735,7 @@ var dy = Math.abs(this.info.y - y);
 return dx >= TRACK_DISTANCE || dy >= TRACK_DISTANCE;
 },
 mousedown: function (e) {
-var t = e.currentTarget;
+var t = Gestures.findOriginalTarget(e);
 var self = this;
 var movefn = function movefn(e) {
 var x = e.clientX, y = e.clientY;
@@ -628,13 +746,12 @@ x: x,
 y: y
 });
 self.fire(t, e);
-e.preventDefault();
 self.info.started = true;
 }
 };
 var upfn = function upfn(e) {
 if (self.info.started) {
-POINTERSTATE.tapPrevented = true;
+Gestures.prevent('tap');
 movefn(e);
 }
 self.clearInfo();
@@ -652,7 +769,7 @@ this.info.x = ct.clientX;
 this.info.y = ct.clientY;
 },
 touchmove: function (e) {
-var t = e.currentTarget;
+var t = Gestures.findOriginalTarget(e);
 var ct = e.changedTouches[0];
 var x = ct.clientX, y = ct.clientY;
 if (this.hasMovedEnough(x, y)) {
@@ -666,10 +783,10 @@ this.info.started = true;
 }
 },
 touchend: function (e) {
-var t = e.currentTarget;
+var t = Gestures.findOriginalTarget(e);
 var ct = e.changedTouches[0];
 if (this.info.started) {
-POINTERSTATE.tapPrevented = true;
+Gestures.prevent('tap');
 this.info.state = 'end';
 this.info.addMove({
 x: ct.clientX,
@@ -713,38 +830,39 @@ deps: [
 'touchend'
 ],
 emits: ['tap'],
-start: {
+info: {
 x: NaN,
-y: NaN
+y: NaN,
+prevent: false
 },
 reset: function () {
-this.start.x = NaN;
-this.start.y = NaN;
+this.info.x = NaN;
+this.info.y = NaN;
+this.info.prevent = false;
 },
 save: function (e) {
-this.start.x = e.clientX;
-this.start.y = e.clientY;
+this.info.x = e.clientX;
+this.info.y = e.clientY;
 },
 mousedown: function (e) {
-POINTERSTATE.tapPrevented = false;
 this.save(e);
 },
 click: function (e) {
 this.forward(e);
 },
 touchstart: function (e) {
-POINTERSTATE.tapPrevented = false;
 this.save(e.changedTouches[0]);
 },
 touchend: function (e) {
 this.forward(e.changedTouches[0]);
 },
 forward: function (e) {
-var dx = Math.abs(e.clientX - this.start.x);
-var dy = Math.abs(e.clientY - this.start.y);
+var dx = Math.abs(e.clientX - this.info.x);
+var dy = Math.abs(e.clientY - this.info.y);
+var t = Gestures.findOriginalTarget(e);
 if (isNaN(dx) || isNaN(dy) || dx <= TAP_DISTANCE && dy <= TAP_DISTANCE) {
-if (!POINTERSTATE.tapPrevented) {
-Gestures.fire(e.target, 'tap', {
+if (!this.info.prevent) {
+Gestures.fire(t, 'tap', {
 x: e.clientX,
 y: e.clientY,
 sourceEvent: e
@@ -768,6 +886,13 @@ Gestures.add(node, eventName, handler);
 node.addEventListener(eventName, handler);
 }
 },
+_unlisten: function (node, eventName, handler) {
+if (Gestures.gestures[eventName]) {
+Gestures.remove(node, eventName, handler);
+} else {
+node.removeEventListener(eventName, handler);
+}
+},
 setScrollDirection: function (direction, node) {
 node = node || this;
 Gestures.setTouchAction(node, DIRECTION_MAP[direction] || 'auto');
@@ -775,50 +900,55 @@ Gestures.setTouchAction(node, DIRECTION_MAP[direction] || 'auto');
 });
 Polymer.Gestures = Gestures;
 }());
-Polymer.Async = function () {
-var currVal = 0;
-var lastVal = 0;
-var callbacks = [];
-var twiddle = document.createTextNode('');
-function runAsync(callback, waitTime) {
+Polymer.Async = {
+_currVal: 0,
+_lastVal: 0,
+_callbacks: [],
+_twiddleContent: 0,
+_twiddle: document.createTextNode(''),
+run: function (callback, waitTime) {
 if (waitTime > 0) {
 return ~setTimeout(callback, waitTime);
 } else {
-twiddle.textContent = currVal++;
-callbacks.push(callback);
-return currVal - 1;
-}
+this._twiddle.textContent = this._twiddleContent++;
+this._callbacks.push(callback);
+return this._currVal++;
 }
-function cancelAsync(handle) {
+},
+cancel: function (handle) {
 if (handle < 0) {
 clearTimeout(~handle);
 } else {
-var idx = handle - lastVal;
+var idx = handle - this._lastVal;
 if (idx >= 0) {
-if (!callbacks[idx]) {
+if (!this._callbacks[idx]) {
 throw 'invalid async handle: ' + handle;
 }
-callbacks[idx] = null;
+this._callbacks[idx] = null;
 }
 }
-}
-function atEndOfMicrotask() {
-var len = callbacks.length;
+},
+_atEndOfMicrotask: function () {
+var len = this._callbacks.length;
 for (var i = 0; i < len; i++) {
-var cb = callbacks[i];
+var cb = this._callbacks[i];
 if (cb) {
+try {
 cb();
+} catch (e) {
+i++;
+this._callbacks.splice(0, i);
+this._lastVal += i;
+this._twiddle.textContent = this._twiddleContent++;
+throw e;
 }
 }
-callbacks.splice(0, len);
-lastVal += len;
 }
-new (window.MutationObserver || JsMutationObserver)(atEndOfMicrotask).observe(twiddle, { characterData: true });
-return {
-run: runAsync,
-cancel: cancelAsync
+this._callbacks.splice(0, len);
+this._lastVal += len;
+}
 };
-}();
+new (window.MutationObserver || JsMutationObserver)(Polymer.Async._atEndOfMicrotask.bind(Polymer.Async)).observe(Polymer.Async._twiddle, { characterData: true });
 Polymer.Debounce = function () {
 var Async = Polymer.Async;
 var Debouncer = function (context) {
@@ -901,7 +1031,8 @@ Polymer.dom(toElement).setAttribute(name, '');
 }
 },
 getContentChildNodes: function (slctr) {
-return Polymer.dom(Polymer.dom(this.root).querySelector(slctr || 'content')).getDistributedNodes();
+var content = Polymer.dom(this.root).querySelector(slctr || 'content');
+return content ? Polymer.dom(content).getDistributedNodes() : [];
 },
 getContentChildren: function (slctr) {
 return this.getContentChildNodes(slctr).filter(function (n) {
@@ -913,9 +1044,10 @@ options = options || Polymer.nob;
 var node = options.node || this;
 var detail = detail === null || detail === undefined ? Polymer.nob : detail;
 var bubbles = options.bubbles === undefined ? true : options.bubbles;
+var cancelable = Boolean(options.cancelable);
 var event = new CustomEvent(type, {
 bubbles: Boolean(bubbles),
-cancelable: Boolean(options.cancelable),
+cancelable: cancelable,
 detail: detail
 });
 node.dispatchEvent(event);
@@ -972,30 +1104,25 @@ elt[n] = props[n];
 }
 }
 return elt;
-},
-mixin: function (target, source) {
-for (var i in source) {
-target[i] = source[i];
-}
 }
 });
 Polymer.Bind = {
 prepareModel: function (model) {
 model._propertyEffects = {};
 model._bindListeners = [];
-var api = this._modelApi;
-for (var n in api) {
-model[n] = api[n];
-}
+Polymer.Base.mixin(model, this._modelApi);
 },
 _modelApi: {
 _notifyChange: function (property) {
 var eventName = Polymer.CaseMap.camelToDashCase(property) + '-changed';
-this.fire(eventName, { value: this[property] }, { bubbles: false });
+Polymer.Base.fire(eventName, { value: this[property] }, {
+bubbles: false,
+node: this
+});
 },
-_propertySet: function (property, value, effects) {
+_propertySetter: function (property, value, effects, fromAbove) {
 var old = this.__data__[property];
-if (old !== value) {
+if (old !== value && (old === old || value === value)) {
 this.__data__[property] = value;
 if (typeof value == 'object') {
 this._clearPath(property);
@@ -1004,16 +1131,25 @@ if (this._propertyChanged) {
 this._propertyChanged(property, value, old);
 }
 if (effects) {
-this._effectEffects(property, value, effects, old);
+this._effectEffects(property, value, effects, old, fromAbove);
 }
 }
 return old;
 },
-_effectEffects: function (property, value, effects, old) {
+__setProperty: function (property, value, quiet, node) {
+node = node || this;
+var effects = node._propertyEffects && node._propertyEffects[property];
+if (effects) {
+node._propertySetter(property, value, effects, quiet);
+} else {
+node[property] = value;
+}
+},
+_effectEffects: function (property, value, effects, old, fromAbove) {
 effects.forEach(function (fx) {
 var fn = Polymer.Bind['_' + fx.kind + 'Effect'];
 if (fn) {
-fn.call(this, property, value, fx.effect, old);
+fn.call(this, property, value, fx.effect, old, fromAbove);
 }
 }, this);
 },
@@ -1071,10 +1207,13 @@ return this.__data__[property];
 }
 };
 var setter = function (value) {
-this._propertySet(property, value, effects);
+this._propertySetter(property, value, effects);
 };
-if (model.getPropertyInfo && model.getPropertyInfo(property).readOnly) {
+var info = model.getPropertyInfo && model.getPropertyInfo(property);
+if (info && info.readOnly) {
+if (!info.computed) {
 model['_set' + this.upper(property)] = setter;
+}
 } else {
 defun.set = setter;
 }
@@ -1145,11 +1284,13 @@ return this._applyEffectValue(calc, effect);
 _reflectEffect: function (source) {
 this.reflectPropertyToAttribute(source);
 },
-_notifyEffect: function (source) {
+_notifyEffect: function (source, value, effect, old, fromAbove) {
+if (!fromAbove) {
 this._notifyChange(source);
+}
 },
-_functionEffect: function (source, value, fn, old) {
-fn.call(this, source, value, old);
+_functionEffect: function (source, value, fn, old, fromAbove) {
+fn.call(this, source, value, old, fromAbove);
 },
 _observerEffect: function (source, value, effect, old) {
 var fn = this[effect.method];
@@ -1175,7 +1316,7 @@ var args = Polymer.Bind._marshalArgs(this.__data__, effect, source, value);
 if (args) {
 var fn = this[effect.method];
 if (fn) {
-this[effect.property] = fn.apply(this, args);
+this.__setProperty(effect.property, fn.apply(this, args));
 } else {
 this._warn(this._logf('_computeEffect', 'compute method `' + effect.method + '` not defined'));
 }
@@ -1248,6 +1389,7 @@ if (prop.observer) {
 this._addObserverEffect(p, prop.observer);
 }
 if (prop.computed) {
+prop.readOnly = true;
 this._addComputedEffect(p, prop.computed);
 }
 if (prop.notify) {
@@ -1438,12 +1580,13 @@ this._configure();
 },
 _configure: function () {
 this._configureAnnotationReferences();
+this._aboveConfig = this.mixin({}, this._config);
 var config = {};
 this.behaviors.forEach(function (b) {
 this._configureProperties(b.properties, config);
 }, this);
 this._configureProperties(this.properties, config);
-this._mixinConfigure(config, this._config);
+this._mixinConfigure(config, this._aboveConfig);
 this._config = config;
 this._distributeConfig(this._config);
 },
@@ -1487,18 +1630,13 @@ node._configValue(x.effect.name, value);
 },
 _afterClientsReady: function () {
 this._executeStaticEffects();
-this._applyConfig(this._config);
+this._applyConfig(this._config, this._aboveConfig);
 this._flushHandlers();
 },
-_applyConfig: function (config) {
+_applyConfig: function (config, aboveConfig) {
 for (var n in config) {
 if (this[n] === undefined) {
-var effects = this._propertyEffects[n];
-if (effects) {
-this._propertySet(n, config[n], effects);
-} else {
-this[n] = config[n];
-}
+this.__setProperty(n, config[n], n in aboveConfig);
 }
 }
 },
@@ -1527,12 +1665,13 @@ h[0].call(this, h[1], h[2]);
 'use strict';
 Polymer.Base._addFeature({
 notifyPath: function (path, value, fromAbove) {
-var old = this._propertySet(path, value);
-if (old !== value) {
+var old = this._propertySetter(path, value);
+if (old !== value && (old === old || value === value)) {
 this._pathEffector(path, value);
 if (!fromAbove) {
 this._notifyPath(path, value);
 }
+return true;
 }
 },
 _getPathParts: function (path) {
@@ -1565,6 +1704,15 @@ return;
 }
 array = Array.isArray(prop) ? prop : null;
 }
+if (array) {
+var coll = Polymer.Collection.get(array);
+var old = prop[last];
+var key = coll.getKey(old);
+if (key) {
+parts[i] = key;
+coll.setItem(key, value);
+}
+}
 prop[last] = value;
 if (!root) {
 this.notifyPath(parts.join('.'), value);
@@ -1689,7 +1837,7 @@ object: array,
 type: 'splice'
 }];
 var change = {
-keySplices: Polymer.Collection.get(array).applySplices(splices),
+keySplices: Polymer.Collection.applySplices(array, splices),
 indexSplices: splices
 };
 this.set(path + '.splices', change);
@@ -1718,9 +1866,8 @@ return ret;
 splice: function (path, start, deleteCount) {
 var array = this.get(path);
 var args = Array.prototype.slice.call(arguments, 1);
-var rem = array.slice(start, start + deleteCount);
 var ret = array.splice.apply(array, args);
-this._notifySplice(array, path, start, args.length - 2, rem);
+this._notifySplice(array, path, start, args.length - 2, ret);
 return ret;
 },
 shift: function (path) {
@@ -1868,10 +2015,10 @@ var AT_START = '@';
 var rx = {
 comments: /\/\*[^*]*\*+([^\/*][^*]*\*+)*\//gim,
 port: /@import[^;]*;/gim,
-customProp: /(?:^|[\s;])--[^;{]*?:[^{};]*?;/gim,
-mixinProp: /(?:^|[\s;])--[^;{]*?:[^{;]*?{[^}]*?};?/gim,
-mixinApply: /@apply[\s]*\([^)]*?\)[\s]*;/gim,
-varApply: /[^;:]*?:[^;]*var[^;]*;/gim,
+customProp: /(?:^|[\s;])--[^;{]*?:[^{};]*?(?:[;\n]|$)/gim,
+mixinProp: /(?:^|[\s;])--[^;{]*?:[^{;]*?{[^}]*?}(?:[;\n]|$)?/gim,
+mixinApply: /@apply[\s]*\([^)]*?\)[\s]*(?:[;\n]|$)?/gim,
+varApply: /[^;:]*?:[^;]*var[^;]*(?:[;\n]|$)?/gim,
 keyframesRule: /^@[^\s]*keyframes/
 };
 return api;
@@ -1889,12 +2036,14 @@ this.forEachStyleRule(rules, callback);
 return this.parser.stringify(rules, preserveProperties);
 },
 forRulesInStyles: function (styles, callback) {
+if (styles) {
 for (var i = 0, l = styles.length, s; i < l && (s = styles[i]); i++) {
 this.forEachStyleRule(this.rulesForStyle(s), callback);
 }
+}
 },
 rulesForStyle: function (style) {
-if (!style.__cssRules) {
+if (!style.__cssRules && style.textContent) {
 style.__cssRules = this.parser.parse(style.textContent);
 }
 return style.__cssRules;
@@ -2047,23 +2196,33 @@ rule.selector = p$.join(COMPLEX_SELECTOR_SEP);
 },
 _transformComplexSelector: function (selector, scope, hostScope) {
 var stop = false;
+var hostContext = false;
 var self = this;
 selector = selector.replace(SIMPLE_SELECTOR_SEP, function (m, c, s) {
 if (!stop) {
-var o = self._transformCompoundSelector(s, c, scope, hostScope);
-if (o.stop) {
-stop = true;
-}
-c = o.combinator;
-s = o.value;
+var info = self._transformCompoundSelector(s, c, scope, hostScope);
+stop = stop || info.stop;
+hostContext = hostContext || info.hostContext;
+c = info.combinator;
+s = info.value;
+} else {
+s = s.replace(SCOPE_JUMP, ' ');
 }
 return c + s;
 });
+if (hostContext) {
+selector = selector.replace(HOST_CONTEXT_PAREN, function (m, pre, paren, post) {
+return pre + paren + ' ' + hostScope + post + COMPLEX_SELECTOR_SEP + ' ' + pre + hostScope + paren + post;
+});
+}
 return selector;
 },
 _transformCompoundSelector: function (selector, combinator, scope, hostScope) {
 var jumpIndex = selector.search(SCOPE_JUMP);
-if (selector.indexOf(HOST) >= 0) {
+var hostContext = false;
+if (selector.indexOf(HOST_CONTEXT) >= 0) {
+hostContext = true;
+} else if (selector.indexOf(HOST) >= 0) {
 selector = selector.replace(HOST_PAREN, function (m, host, paren) {
 return hostScope + paren;
 });
@@ -2082,7 +2241,8 @@ stop = true;
 return {
 value: selector,
 combinator: combinator,
-stop: stop
+stop: stop,
+hostContext: hostContext
 };
 },
 _transformSimpleSelector: function (selector, scope) {
@@ -2090,20 +2250,32 @@ var p$ = selector.split(PSEUDO_PREFIX);
 p$[0] += scope;
 return p$.join(PSEUDO_PREFIX);
 },
-rootRule: function (rule) {
-this._transformRule(rule, this._transformRootSelector);
+documentRule: function (rule) {
+rule.selector = rule.parsedSelector;
+this.normalizeRootSelector(rule);
+if (!nativeShadow) {
+this._transformRule(rule, this._transformDocumentSelector);
+}
+},
+normalizeRootSelector: function (rule) {
+if (rule.selector === ROOT) {
+rule.selector = 'body';
+}
 },
-_transformRootSelector: function (selector) {
-return selector.match(SCOPE_JUMP) ? this._transformComplexSelector(selector) : selector.trim() + SCOPE_ROOT_SELECTOR;
+_transformDocumentSelector: function (selector) {
+return selector.match(SCOPE_JUMP) ? this._transformComplexSelector(selector, SCOPE_DOC_SELECTOR) : this._transformSimpleSelector(selector.trim(), SCOPE_DOC_SELECTOR);
 },
 SCOPE_NAME: 'style-scope'
 };
 var SCOPE_NAME = api.SCOPE_NAME;
-var SCOPE_ROOT_SELECTOR = ':not([' + SCOPE_NAME + '])' + ':not(.' + SCOPE_NAME + ')';
+var SCOPE_DOC_SELECTOR = ':not([' + SCOPE_NAME + '])' + ':not(.' + SCOPE_NAME + ')';
 var COMPLEX_SELECTOR_SEP = ',';
 var SIMPLE_SELECTOR_SEP = /(^|[\s>+~]+)([^\s>+~]+)/g;
 var HOST = ':host';
+var ROOT = ':root';
 var HOST_PAREN = /(\:host)(?:\(((?:\([^)(]*\)|[^)(]*)+?)\))/g;
+var HOST_CONTEXT = ':host-context';
+var HOST_CONTEXT_PAREN = /(.*)(?:\:host-context)(?:\(((?:\([^)(]*\)|[^)(]*)+?)\))(.*)/;
 var CONTENT = '::content';
 var SCOPE_JUMP = /\:\:content|\:\:shadow|\/deep\//;
 var CSS_CLASS_PREFIX = '.';
@@ -2278,6 +2450,7 @@ return mo;
 });
 }());
 Polymer.StyleProperties = function () {
+'use strict';
 var nativeShadow = Polymer.Settings.useNativeShadow;
 var matchesSelector = Polymer.DomApi.matchesSelector;
 var styleUtil = Polymer.StyleUtil;
@@ -2344,6 +2517,10 @@ collectPropertiesInCssText: function (cssText, props) {
 var m;
 while (m = this.rx.VAR_CAPTURE.exec(cssText)) {
 props[m[1]] = true;
+var def = m[2];
+if (def && def.match(this.rx.IS_VAR)) {
+props[def] = true;
+}
 }
 },
 reify: function (props) {
@@ -2443,27 +2620,29 @@ return props;
 },
 transformStyles: function (element, properties, scopeSelector) {
 var self = this;
-var hostRx = new RegExp(this.rx.HOST_PREFIX + element.is + this.rx.HOST_SUFFIX);
+var hostSelector = styleTransformer._calcHostScope(element.is, element.extends);
+var rxHostSelector = element.extends ? '\\' + hostSelector.slice(0, -1) + '\\]' : hostSelector;
+var hostRx = new RegExp(this.rx.HOST_PREFIX + rxHostSelector + this.rx.HOST_SUFFIX);
 return styleTransformer.elementStyles(element, function (rule) {
 self.applyProperties(rule, properties);
 if (rule.cssText && !nativeShadow) {
-self._scopeSelector(rule, hostRx, element.is, element._scopeCssViaAttr, scopeSelector);
+self._scopeSelector(rule, hostRx, hostSelector, element._scopeCssViaAttr, scopeSelector);
 }
 });
 },
-_scopeSelector: function (rule, hostRx, is, viaAttr, scopeId) {
+_scopeSelector: function (rule, hostRx, hostSelector, viaAttr, scopeId) {
 rule.transformedSelector = rule.transformedSelector || rule.selector;
 var selector = rule.transformedSelector;
 var scope = viaAttr ? '[' + styleTransformer.SCOPE_NAME + '~=' + scopeId + ']' : '.' + scopeId;
 var parts = selector.split(',');
 for (var i = 0, l = parts.length, p; i < l && (p = parts[i]); i++) {
-parts[i] = p.match(hostRx) ? p.replace(is, is + scope) : scope + ' ' + p;
+parts[i] = p.match(hostRx) ? p.replace(hostSelector, hostSelector + scope) : scope + ' ' + p;
 }
 rule.selector = parts.join(',');
 },
 applyElementScopeSelector: function (element, selector, old, viaAttr) {
 var c = viaAttr ? element.getAttribute(styleTransformer.SCOPE_NAME) : element.className;
-v = old ? c.replace(old, selector) : (c ? c + ' ' : '') + this.XSCOPE_NAME + ' ' + selector;
+var v = old ? c.replace(old, selector) : (c ? c + ' ' : '') + this.XSCOPE_NAME + ' ' + selector;
 if (c !== v) {
 if (viaAttr) {
 element.setAttribute(styleTransformer.SCOPE_NAME, v);
@@ -2477,7 +2656,7 @@ var cssText = style ? style.textContent || '' : this.transformStyles(element, pr
 var s = element._customStyle;
 if (s && !nativeShadow && s !== style) {
 s._useCount--;
-if (s._useCount <= 0) {
+if (s._useCount <= 0 && s.parentNode) {
 s.parentNode.removeChild(s);
 }
 }
@@ -2498,13 +2677,23 @@ element._customStyle = style;
 }
 return style;
 },
+mixinCustomStyle: function (props, customStyle) {
+var v;
+for (var i in customStyle) {
+v = customStyle[i];
+if (v || v === 0) {
+props[i] = v;
+}
+}
+},
 rx: {
-VAR_ASSIGN: /(?:^|;\s*)(--[^\:;]*?):\s*?(?:([^;{]*?)|{([^}]*)})(?=;)/gim,
-MIXIN_MATCH: /(?:^|\W+)@apply[\s]*\(([^)]*)\);?/im,
-VAR_MATCH: /(^|\W+)var\([\s]*([^,)]*)[\s]*,?[\s]*((?:[^,)]*)|(?:[^;]*\([^;)]*\)))[\s]*?\)/gim,
-VAR_CAPTURE: /\([\s]*(--[^,\s)]*)(?:,[\s]*(--[^,\s)]*))?(?:\)|,)/gim,
+VAR_ASSIGN: /(?:^|[;\n]\s*)(--[\w-]*?):\s*(?:([^;{]*)|{([^}]*)})(?:(?=[;\n])|$)/gi,
+MIXIN_MATCH: /(?:^|\W+)@apply[\s]*\(([^)]*)\)/i,
+VAR_MATCH: /(^|\W+)var\([\s]*([^,)]*)[\s]*,?[\s]*((?:[^,)]*)|(?:[^;]*\([^;)]*\)))[\s]*?\)/gi,
+VAR_CAPTURE: /\([\s]*(--[^,\s)]*)(?:,[\s]*(--[^,\s)]*))?(?:\)|,)/gi,
+IS_VAR: /^--/,
 BRACKETED: /\{[^}]*\}/g,
-HOST_PREFIX: '(?:^|[^.])',
+HOST_PREFIX: '(?:^|[^.#[:])',
 HOST_SUFFIX: '($|[.:[\\s>+~])'
 },
 HOST_SELECTORS: [':host'],
@@ -2517,35 +2706,6 @@ var v = 1 << n % 32;
 bits[o] = (bits[o] || 0) | v;
 }
 }();
-Polymer.StyleDefaults = function () {
-var styleProperties = Polymer.StyleProperties;
-var styleUtil = Polymer.StyleUtil;
-var style = document.createElement('style');
-var api = {
-style: style,
-_styles: [style],
-_properties: null,
-applyCss: function (cssText) {
-this.style.textContent += cssText;
-styleUtil.clearStyleRules(this.style);
-this._properties = null;
-},
-get _styleProperties() {
-if (!this._properties) {
-styleProperties.decorateStyles(this._styles);
-this._styles._scopeStyleProperties = null;
-this._properties = styleProperties.scopePropertiesFromStyles(this._styles);
-}
-return this._properties;
-},
-_needsStyleProperties: function () {
-},
-_computeStyleProperties: function () {
-return this._styleProperties;
-}
-};
-return api;
-}();
 (function () {
 Polymer.StyleCache = function () {
 this.cache = {};
@@ -2576,8 +2736,10 @@ clear: function () {
 this.cache = {};
 },
 _objectsEqual: function (target, source) {
+var t, s;
 for (var i in target) {
-if (target[i] !== source[i]) {
+t = target[i], s = source[i];
+if (!(typeof t === 'object' && t ? this._objectsStrictlyEqual(t, s) : t === s)) {
 return false;
 }
 }
@@ -2585,10 +2747,57 @@ if (Array.isArray(target)) {
 return target.length === source.length;
 }
 return true;
+},
+_objectsStrictlyEqual: function (target, source) {
+return this._objectsEqual(target, source) && this._objectsEqual(source, target);
 }
 };
 }());
+Polymer.StyleDefaults = function () {
+var styleProperties = Polymer.StyleProperties;
+var styleUtil = Polymer.StyleUtil;
+var StyleCache = Polymer.StyleCache;
+var api = {
+_styles: [],
+_properties: null,
+customStyle: {},
+_styleCache: new StyleCache(),
+addStyle: function (style) {
+this._styles.push(style);
+this._properties = null;
+},
+get _styleProperties() {
+if (!this._properties) {
+styleProperties.decorateStyles(this._styles);
+this._styles._scopeStyleProperties = null;
+this._properties = styleProperties.scopePropertiesFromStyles(this._styles);
+styleProperties.mixinCustomStyle(this._properties, this.customStyle);
+styleProperties.reify(this._properties);
+}
+return this._properties;
+},
+_needsStyleProperties: function () {
+},
+_computeStyleProperties: function () {
+return this._styleProperties;
+},
+updateStyles: function (properties) {
+this._properties = null;
+if (properties) {
+Polymer.Base.mixin(this.customStyle, properties);
+}
+this._styleCache.clear();
+for (var i = 0, s; i < this._styles.length; i++) {
+s = this._styles[i];
+s = s.__importElement || s;
+s._apply();
+}
+}
+};
+return api;
+}();
 (function () {
+'use strict';
 var serializeValueToAttribute = Polymer.Base.serializeValueToAttribute;
 var propertyUtils = Polymer.StyleProperties;
 var styleTransformer = Polymer.StyleTransformer;
@@ -2610,12 +2819,23 @@ if (!this._scopeSelector && this._needsStyleProperties()) {
 this._updateStyleProperties();
 }
 },
+_findStyleHost: function () {
+var e = this, root;
+while (root = Polymer.dom(e).getOwnerRoot()) {
+if (Polymer.isInstance(root.host)) {
+return root.host;
+}
+e = root.host;
+}
+return styleDefaults;
+},
 _updateStyleProperties: function () {
-var info, scope = this.domHost || styleDefaults;
+var info, scope = this._findStyleHost();
 if (!scope._styleCache) {
 scope._styleCache = new Polymer.StyleCache();
 }
 var scopeData = propertyUtils.propertyDataFromStyles(scope._styles, this);
+scopeData.key.customStyle = this.customStyle;
 info = scope._styleCache.retrieve(this.is, scopeData.key, this._styles);
 var scopeCached = Boolean(info);
 if (scopeCached) {
@@ -2628,17 +2848,16 @@ if (!scopeCached) {
 info = styleCache.retrieve(this.is, this._ownStyleProperties, this._styles);
 }
 var globalCached = Boolean(info) && !scopeCached;
-style = this._applyStyleProperties(info);
+var style = this._applyStyleProperties(info);
 if (!scopeCached) {
-var cacheableStyle = style;
-if (nativeShadow) {
-cacheableStyle = style.cloneNode ? style.cloneNode(true) : Object.create(style || null);
-}
+style = style && nativeShadow ? style.cloneNode(true) : style;
 info = {
-style: cacheableStyle,
+style: style,
 _scopeSelector: this._scopeSelector,
 _styleProperties: this._styleProperties
 };
+scopeData.key.customStyle = {};
+this.mixin(scopeData.key.customStyle, this.customStyle);
 scope._styleCache.store(this.is, info, scopeData.key, this._styles);
 if (!globalCached) {
 styleCache.store(this.is, Object.create(info), this._ownStyleProperties, this._styles);
@@ -2646,7 +2865,7 @@ styleCache.store(this.is, Object.create(info), this._ownStyleProperties, this._s
 }
 },
 _computeStyleProperties: function (scopeProps) {
-var scope = this.domHost || styleDefaults;
+var scope = this._findStyleHost();
 if (!scope._styleProperties) {
 scope._computeStyleProperties();
 }
@@ -2655,7 +2874,7 @@ this.mixin(props, propertyUtils.hostPropertiesFromStyles(this._styles));
 scopeProps = scopeProps || propertyUtils.propertyDataFromStyles(scope._styles, this).properties;
 this.mixin(props, scopeProps);
 this.mixin(props, propertyUtils.scopePropertiesFromStyles(this._styles));
-this.mixin(props, this.customStyle);
+propertyUtils.mixinCustomStyle(props, this.customStyle);
 propertyUtils.reify(props);
 this._styleProperties = props;
 },
@@ -2671,15 +2890,15 @@ _scopeCount: 0,
 _applyStyleProperties: function (info) {
 var oldScopeSelector = this._scopeSelector;
 this._scopeSelector = info ? info._scopeSelector : this.is + '-' + this.__proto__._scopeCount++;
-style = propertyUtils.applyElementStyle(this, this._styleProperties, this._scopeSelector, info && info.style);
-if ((style || oldScopeSelector) && !nativeShadow) {
+var style = propertyUtils.applyElementStyle(this, this._styleProperties, this._scopeSelector, info && info.style);
+if (!nativeShadow) {
 propertyUtils.applyElementScopeSelector(this, this._scopeSelector, oldScopeSelector, this._scopeCssViaAttr);
 }
-return style || {};
+return style;
 },
 serializeValueToAttribute: function (value, attribute, node) {
 node = node || this;
-if (attribute === 'class') {
+if (attribute === 'class' && !nativeShadow) {
 var host = node === this ? this.domHost || this.dataHost : this;
 if (host) {
 value = host._scopeElementClass(node, value);
@@ -2694,8 +2913,11 @@ selector += (selector ? ' ' : '') + SCOPE_NAME + ' ' + this.is + (element._scope
 }
 return selector;
 },
-updateStyles: function () {
+updateStyles: function (properties) {
 if (this.isAttached) {
+if (properties) {
+this.mixin(this.customStyle, properties);
+}
 if (this._needsStyleProperties()) {
 this._updateStyleProperties();
 } else {
@@ -2719,8 +2941,8 @@ c.updateStyles();
 }
 }
 });
-Polymer.updateStyles = function () {
-styleDefaults._styleCache.clear();
+Polymer.updateStyles = function (properties) {
+styleDefaults.updateStyles(properties);
 Polymer.Base._updateRootStyles(document);
 };
 var styleCache = new Polymer.StyleCache();
@@ -2732,7 +2954,6 @@ Polymer.Base._addFeature({
 _registerFeatures: function () {
 this._prepIs();
 this._prepAttributes();
-this._prepExtends();
 this._prepConstructor();
 this._prepTemplate();
 this._prepStyles();
@@ -2772,53 +2993,52 @@ var nativeShadow = Polymer.Settings.useNativeShadow;
 var propertyUtils = Polymer.StyleProperties;
 var styleUtil = Polymer.StyleUtil;
 var styleDefaults = Polymer.StyleDefaults;
+var styleTransformer = Polymer.StyleTransformer;
 Polymer({
 is: 'custom-style',
 extends: 'style',
 created: function () {
-this._appliesToDocument = this.parentNode.localName !== 'dom-module';
-if (this._appliesToDocument) {
+this._tryApply();
+},
+attached: function () {
+this._tryApply();
+},
+_tryApply: function () {
+if (!this._appliesToDocument) {
+if (this.parentNode && this.parentNode.localName !== 'dom-module') {
+this._appliesToDocument = true;
 var e = this.__appliedElement || this;
-var rules = styleUtil.rulesForStyle(e);
-propertyUtils.decorateStyles([e]);
-this._rulesToDefaultProperties(rules);
-this.async(this._applyStyle);
+styleDefaults.addStyle(e);
+if (e.textContent) {
+this._apply();
+} else {
+var observer = new MutationObserver(function () {
+observer.disconnect();
+this._apply();
+}.bind(this));
+observer.observe(e, { childList: true });
+}
+}
 }
 },
-_applyStyle: function () {
+_apply: function () {
 var e = this.__appliedElement || this;
 this._computeStyleProperties();
 var props = this._styleProperties;
 var self = this;
 e.textContent = styleUtil.toCssText(styleUtil.rulesForStyle(e), function (rule) {
-if (rule.selector === ':root') {
-rule.selector = 'body';
-}
 var css = rule.cssText = rule.parsedCssText;
 if (rule.propertyInfo && rule.propertyInfo.cssText) {
 css = css.replace(propertyUtils.rx.VAR_ASSIGN, '');
 rule.cssText = propertyUtils.valueForProperties(css, props);
 }
-if (!nativeShadow) {
-Polymer.StyleTransformer.rootRule(rule);
-}
+styleTransformer.documentRule(rule);
 });
-},
-_rulesToDefaultProperties: function (rules) {
-styleUtil.forEachStyleRule(rules, function (rule) {
-if (!rule.propertyInfo.properties) {
-rule.cssText = '';
-}
-});
-var cssText = styleUtil.parser.stringify(rules, true);
-if (cssText) {
-styleDefaults.applyCss(cssText);
-}
 }
 });
 }());
 Polymer.Templatizer = {
-properties: { _hideTemplateChildren: { observer: '_showHideChildren' } },
+properties: { __hideTemplateChildren__: { observer: '_showHideChildren' } },
 _templatizerStatic: {
 count: 0,
 callbacks: {},
@@ -2847,6 +3067,7 @@ this._prepParentProperties(archetype, template);
 archetype._notifyPath = this._notifyPathImpl;
 archetype._scopeElementClass = this._scopeElementClassImpl;
 archetype.listen = this._listenImpl;
+archetype._showHideChildren = this._showHideChildrenImpl;
 var _constructor = this._constructorImpl;
 var ctor = function TemplateInstance(model, host) {
 _constructor.call(this, model, host);
@@ -2859,7 +3080,15 @@ this.ctor = ctor;
 _getRootDataHost: function () {
 return this.dataHost && this.dataHost._rootDataHost || this.dataHost;
 },
-_showHideChildren: function (hidden) {
+_showHideChildrenImpl: function (hide) {
+var c = this._children;
+for (var i = 0; i < c.length; i++) {
+var n = c[i];
+if (n.style) {
+n.style.display = hide ? 'none' : '';
+n.__hideTemplateChildren__ = hide;
+}
+}
 },
 _debounceTemplate: function (fn) {
 this._templatizerStatic.callbacks[this._templatizerId] = fn.bind(this);
@@ -2882,6 +3111,9 @@ var parentProps = archetype._parentProps;
 for (var prop in parentProps) {
 archetype._addPropertyEffect(prop, 'function', this._createHostPropEffector(prop));
 }
+for (var prop in this._instanceProps) {
+archetype._addPropertyEffect(prop, 'function', this._createInstancePropEffector(prop));
+}
 },
 _customPrepAnnotations: function (archetype, template) {
 archetype._template = template;
@@ -2940,18 +3172,29 @@ return function (source, value) {
 this.dataHost['_parent_' + prop] = value;
 };
 },
+_createInstancePropEffector: function (prop) {
+return function (source, value, old, fromAbove) {
+if (!fromAbove) {
+this.dataHost._forwardInstanceProp(this, prop, value);
+}
+};
+},
 _extendTemplate: function (template, proto) {
 Object.getOwnPropertyNames(proto).forEach(function (n) {
 var val = template[n];
 var pd = Object.getOwnPropertyDescriptor(proto, n);
 Object.defineProperty(template, n, pd);
 if (val !== undefined) {
-template._propertySet(n, val);
+template._propertySetter(n, val);
 }
 });
 },
+_showHideChildren: function (hidden) {
+},
 _forwardInstancePath: function (inst, path, value) {
 },
+_forwardInstanceProp: function (inst, prop, value) {
+},
 _notifyPathImpl: function (path, value) {
 var dataHost = this.dataHost;
 var dot = path.indexOf('.');
@@ -2974,6 +3217,7 @@ this._rootDataHost = host._getRootDataHost();
 this._setupConfigure(model);
 this._pushHost(host);
 this.root = this.instanceTemplate(this._template);
+this.root.__noContent = !this._notes._hasContent;
 this.root.__styleScoped = true;
 this._popHost();
 this._marshalAnnotatedNodes();
@@ -2985,6 +3229,9 @@ children.push(n);
 n._templateInstance = this;
 }
 this._children = children;
+if (host.__hideTemplateChildren__) {
+this._showHideChildren(true);
+}
 this._tryReady();
 },
 _listenImpl: function (node, eventName, methodName) {
@@ -3011,6 +3258,20 @@ model[prop] = this['_parent_' + prop];
 }
 }
 return new this.ctor(model, this);
+},
+modelForElement: function (el) {
+var model;
+while (el) {
+if (model = el._templateInstance) {
+if (model.dataHost != this) {
+el = model.dataHost;
+} else {
+return model;
+}
+} else {
+el = el.parentNode;
+}
+}
 }
 };
 Polymer({
@@ -3057,7 +3318,7 @@ this._removeFromMap(this.store[key]);
 delete this.store[key];
 },
 _removeFromMap: function (item) {
-if (typeof item == 'object') {
+if (item && typeof item == 'object') {
 this.omap.delete(item);
 } else {
 delete this.pmap[item];
@@ -3069,7 +3330,7 @@ this.removeKey(key);
 return key;
 },
 getKey: function (item) {
-if (typeof item == 'object') {
+if (item && typeof item == 'object') {
 return this.omap.get(item);
 } else {
 return this.pmap[item];
@@ -3078,8 +3339,17 @@ return this.pmap[item];
 getKeys: function () {
 return Object.keys(this.store);
 },
-setItem: function (key, value) {
-this.store[key] = value;
+setItem: function (key, item) {
+var old = this.store[key];
+if (old) {
+this._removeFromMap(old);
+}
+if (item && typeof item == 'object') {
+this.omap.set(item, key);
+} else {
+this.pmap[item] = key;
+}
+this.store[key] = item;
 },
 getItem: function (key) {
 return this.store[key];
@@ -3091,7 +3361,7 @@ items.push(store[key]);
 }
 return items;
 },
-applySplices: function (splices) {
+_applySplices: function (splices) {
 var keySplices = [];
 for (var i = 0; i < splices.length; i++) {
 var j, o, key, s = splices[i];
@@ -3120,6 +3390,10 @@ return keySplices;
 Polymer.Collection.get = function (userArray) {
 return Polymer._collections.get(userArray) || new Polymer.Collection(userArray);
 };
+Polymer.Collection.applySplices = function (userArray, splices) {
+var coll = Polymer._collections.get(userArray);
+return coll ? coll._applySplices(splices) : null;
+};
 Polymer({
 is: 'dom-repeat',
 extends: 'template',
@@ -3149,19 +3423,18 @@ delay: Number
 },
 behaviors: [Polymer.Templatizer],
 observers: ['_itemsChanged(items.*)'],
+created: function () {
+this._instances = [];
+},
 detached: function () {
-if (this.rows) {
-for (var i = 0; i < this.rows.length; i++) {
+for (var i = 0; i < this._instances.length; i++) {
 this._detachRow(i);
 }
-}
 },
 attached: function () {
-if (this.rows) {
 var parentNode = Polymer.dom(this).parentNode;
-for (var i = 0; i < this.rows.length; i++) {
-Polymer.dom(parentNode).insertBefore(this.rows[i].root, this);
-}
+for (var i = 0; i < this._instances.length; i++) {
+Polymer.dom(parentNode).insertBefore(this._instances[i].root, this);
 }
 },
 ready: function () {
@@ -3178,7 +3451,7 @@ var sort = this.sort;
 this._sortFn = sort && (typeof sort == 'function' ? sort : function () {
 return dataHost[sort].apply(dataHost, arguments);
 });
-this._fullRefresh = true;
+this._needFullRefresh = true;
 if (this.items) {
 this._debounceTemplate(this._render);
 }
@@ -3189,7 +3462,7 @@ var filter = this.filter;
 this._filterFn = filter && (typeof filter == 'function' ? filter : function () {
 return dataHost[filter].apply(dataHost, arguments);
 });
-this._fullRefresh = true;
+this._needFullRefresh = true;
 if (this.items) {
 this._debounceTemplate(this._render);
 }
@@ -3207,7 +3480,7 @@ this.collection = null;
 this._error(this._logf('dom-repeat', 'expected array for `items`,' + ' found', this.items));
 }
 this._splices = [];
-this._fullRefresh = true;
+this._needFullRefresh = true;
 this._debounceTemplate(this._render);
 } else if (change.path == 'items.splices') {
 this._splices = this._splices.concat(change.value.keySplices);
@@ -3224,7 +3497,7 @@ path = path.substring(path.indexOf('.') + 1);
 var paths = this._observePaths;
 for (var i = 0; i < paths.length; i++) {
 if (path.indexOf(paths[i]) === 0) {
-this._fullRefresh = true;
+this._needFullRefresh = true;
 if (this.delay) {
 this.debounce('render', this._render, this.delay);
 } else {
@@ -3236,102 +3509,111 @@ return;
 }
 },
 render: function () {
-this._fullRefresh = true;
-this.debounce('render', this._render);
+this._needFullRefresh = true;
+this._debounceTemplate(this._render);
 this._flushTemplates();
 },
 _render: function () {
 var c = this.collection;
-if (!this._fullRefresh) {
+if (this._needFullRefresh) {
+this._applyFullRefresh();
+this._needFullRefresh = false;
+} else {
 if (this._sortFn) {
-this._applySplicesViewSort(this._splices);
+this._applySplicesUserSort(this._splices);
 } else {
 if (this._filterFn) {
-this._fullRefresh = true;
+this._applyFullRefresh();
 } else {
-this._applySplicesArraySort(this._splices);
-}
+this._applySplicesArrayOrder(this._splices);
 }
 }
-if (this._fullRefresh) {
-this._sortAndFilter();
-this._fullRefresh = false;
 }
 this._splices = [];
-var rowForKey = this._rowForKey = {};
-var keys = this._orderedKeys;
-this.rows = this.rows || [];
-for (var i = 0; i < keys.length; i++) {
-var key = keys[i];
-var item = c.getItem(key);
-var row = this.rows[i];
-rowForKey[key] = i;
-if (!row) {
-this.rows.push(row = this._insertRow(i, null, item));
-}
-row[this.as] = item;
-row.__key__ = key;
-row[this.indexAs] = i;
-}
-for (; i < this.rows.length; i++) {
-this._detachRow(i);
+var keyToIdx = this._keyToInstIdx = {};
+for (var i = 0; i < this._instances.length; i++) {
+var inst = this._instances[i];
+keyToIdx[inst.__key__] = i;
+inst.__setProperty(this.indexAs, i, true);
 }
-this.rows.splice(keys.length, this.rows.length - keys.length);
 this.fire('dom-change');
 },
-_sortAndFilter: function () {
+_applyFullRefresh: function () {
 var c = this.collection;
-if (!this._sortFn) {
-this._orderedKeys = [];
+var keys;
+if (this._sortFn) {
+keys = c ? c.getKeys() : [];
+} else {
+keys = [];
 var items = this.items;
 if (items) {
 for (var i = 0; i < items.length; i++) {
-this._orderedKeys.push(c.getKey(items[i]));
+keys.push(c.getKey(items[i]));
 }
 }
-} else {
-this._orderedKeys = c ? c.getKeys() : [];
 }
 if (this._filterFn) {
-this._orderedKeys = this._orderedKeys.filter(function (a) {
+keys = keys.filter(function (a) {
 return this._filterFn(c.getItem(a));
 }, this);
 }
 if (this._sortFn) {
-this._orderedKeys.sort(function (a, b) {
+keys.sort(function (a, b) {
 return this._sortFn(c.getItem(a), c.getItem(b));
 }.bind(this));
 }
+for (var i = 0; i < keys.length; i++) {
+var key = keys[i];
+var inst = this._instances[i];
+if (inst) {
+inst.__setProperty('__key__', key, true);
+inst.__setProperty(this.as, c.getItem(key), true);
+} else {
+this._instances.push(this._insertRow(i, key));
+}
+}
+for (; i < this._instances.length; i++) {
+this._detachRow(i);
+}
+this._instances.splice(keys.length, this._instances.length - keys.length);
 },
 _keySort: function (a, b) {
 return this.collection.getKey(a) - this.collection.getKey(b);
 },
-_applySplicesViewSort: function (splices) {
+_applySplicesUserSort: function (splices) {
 var c = this.collection;
-var keys = this._orderedKeys;
-var rows = this.rows;
-var removedRows = [];
-var addedKeys = [];
+var instances = this._instances;
+var keyMap = {};
 var pool = [];
 var sortFn = this._sortFn || this._keySort.bind(this);
 splices.forEach(function (s) {
 for (var i = 0; i < s.removed.length; i++) {
-var idx = this._rowForKey[s.removed[i]];
-if (idx != null) {
-removedRows.push(idx);
-}
+var key = s.removed[i];
+keyMap[key] = keyMap[key] ? null : -1;
 }
 for (var i = 0; i < s.added.length; i++) {
-addedKeys.push(s.added[i]);
+var key = s.added[i];
+keyMap[key] = keyMap[key] ? null : 1;
 }
 }, this);
-if (removedRows.length) {
-removedRows.sort();
-for (var i = removedRows.length - 1; i >= 0; i--) {
-var idx = removedRows[i];
+var removedIdxs = [];
+var addedKeys = [];
+for (var key in keyMap) {
+if (keyMap[key] === -1) {
+removedIdxs.push(this._keyToInstIdx[key]);
+}
+if (keyMap[key] === 1) {
+addedKeys.push(key);
+}
+}
+if (removedIdxs.length) {
+removedIdxs.sort();
+for (var i = removedIdxs.length - 1; i >= 0; i--) {
+var idx = removedIdxs[i];
+if (idx !== undefined) {
 pool.push(this._detachRow(idx));
-rows.splice(idx, 1);
-keys.splice(idx, 1);
+instances.splice(idx, 1);
+}
 }
 }
 if (addedKeys.length) {
@@ -3345,19 +3627,19 @@ return this._sortFn(c.getItem(a), c.getItem(b));
 }.bind(this));
 var start = 0;
 for (var i = 0; i < addedKeys.length; i++) {
-start = this._insertRowIntoViewSort(start, addedKeys[i], pool);
+start = this._insertRowUserSort(start, addedKeys[i], pool);
 }
 }
 },
-_insertRowIntoViewSort: function (start, key, pool) {
+_insertRowUserSort: function (start, key, pool) {
 var c = this.collection;
 var item = c.getItem(key);
-var end = this.rows.length - 1;
+var end = this._instances.length - 1;
 var idx = -1;
 var sortFn = this._sortFn || this._keySort.bind(this);
 while (start <= end) {
 var mid = start + end >> 1;
-var midKey = this._orderedKeys[mid];
+var midKey = this._instances[mid].__key__;
 var cmp = sortFn(c.getItem(midKey), item);
 if (cmp < 0) {
 start = mid + 1;
@@ -3371,121 +3653,114 @@ break;
 if (idx < 0) {
 idx = end + 1;
 }
-this._orderedKeys.splice(idx, 0, key);
-this.rows.splice(idx, 0, this._insertRow(idx, pool, c.getItem(key)));
+this._instances.splice(idx, 0, this._insertRow(idx, key, pool));
 return idx;
 },
-_applySplicesArraySort: function (splices) {
-var keys = this._orderedKeys;
+_applySplicesArrayOrder: function (splices) {
 var pool = [];
+var c = this.collection;
 splices.forEach(function (s) {
 for (var i = 0; i < s.removed.length; i++) {
-pool.push(this._detachRow(s.index + i));
+var inst = this._detachRow(s.index + i);
+if (!inst.isPlaceholder) {
+pool.push(inst);
 }
-this.rows.splice(s.index, s.removed.length);
-}, this);
-var c = this.collection;
-splices.forEach(function (s) {
-var args = [
-s.index,
-s.removed.length
-].concat(s.added);
-keys.splice.apply(keys, args);
+}
+this._instances.splice(s.index, s.removed.length);
 for (var i = 0; i < s.added.length; i++) {
-var item = c.getItem(s.added[i]);
-var row = this._insertRow(s.index + i, pool, item);
-this.rows.splice(s.index + i, 0, row);
+var inst = {
+isPlaceholder: true,
+key: s.added[i]
+};
+this._instances.splice(s.index + i, 0, inst);
 }
 }, this);
+for (var i = this._instances.length - 1; i >= 0; i--) {
+var inst = this._instances[i];
+if (inst.isPlaceholder) {
+this._instances[i] = this._insertRow(i, inst.key, pool, true);
+}
+}
 },
 _detachRow: function (idx) {
-var row = this.rows[idx];
+var inst = this._instances[idx];
+if (!inst.isPlaceholder) {
 var parentNode = Polymer.dom(this).parentNode;
-for (var i = 0; i < row._children.length; i++) {
-var el = row._children[i];
-Polymer.dom(row.root).appendChild(el);
+for (var i = 0; i < inst._children.length; i++) {
+var el = inst._children[i];
+Polymer.dom(inst.root).appendChild(el);
 }
-return row;
+}
+return inst;
 },
-_insertRow: function (idx, pool, item) {
-var row = pool && pool.pop() || this._generateRow(idx, item);
-var beforeRow = this.rows[idx];
+_insertRow: function (idx, key, pool, replace) {
+var inst;
+if (inst = pool && pool.pop()) {
+inst.__setProperty(this.as, this.collection.getItem(key), true);
+inst.__setProperty('__key__', key, true);
+} else {
+inst = this._generateRow(idx, key);
+}
+var beforeRow = this._instances[replace ? idx + 1 : idx];
 var beforeNode = beforeRow ? beforeRow._children[0] : this;
 var parentNode = Polymer.dom(this).parentNode;
-Polymer.dom(parentNode).insertBefore(row.root, beforeNode);
-return row;
+Polymer.dom(parentNode).insertBefore(inst.root, beforeNode);
+return inst;
 },
-_generateRow: function (idx, item) {
-var model = { __key__: this.collection.getKey(item) };
-model[this.as] = item;
+_generateRow: function (idx, key) {
+var model = { __key__: key };
+model[this.as] = this.collection.getItem(key);
 model[this.indexAs] = idx;
-var row = this.stamp(model);
-return row;
+var inst = this.stamp(model);
+return inst;
 },
 _showHideChildren: function (hidden) {
-if (this.rows) {
-for (var i = 0; i < this.rows.length; i++) {
-var c$ = this.rows[i]._children;
-for (var j = 0; j < c$.length; j++) {
-var c = c$[j];
-if (c.style) {
-c.style.display = hidden ? 'none' : '';
-}
-c._hideTemplateChildren = hidden;
+for (var i = 0; i < this._instances.length; i++) {
+this._instances[i]._showHideChildren(hidden);
 }
+},
+_forwardInstanceProp: function (inst, prop, value) {
+if (prop == this.as) {
+var idx;
+if (this._sortFn || this._filterFn) {
+idx = this.items.indexOf(this.collection.getItem(inst.__key__));
+} else {
+idx = inst[this.indexAs];
 }
+this.set('items.' + idx, value);
 }
 },
-_forwardInstancePath: function (row, path, value) {
+_forwardInstancePath: function (inst, path, value) {
 if (path.indexOf(this.as + '.') === 0) {
-this.notifyPath('items.' + row.__key__ + '.' + path.slice(this.as.length + 1), value);
-return true;
+this.notifyPath('items.' + inst.__key__ + '.' + path.slice(this.as.length + 1), value);
 }
 },
 _forwardParentProp: function (prop, value) {
-if (this.rows) {
-this.rows.forEach(function (row) {
-row[prop] = value;
+this._instances.forEach(function (inst) {
+inst.__setProperty(prop, value, true);
 }, this);
-}
 },
 _forwardParentPath: function (path, value) {
-if (this.rows) {
-this.rows.forEach(function (row) {
-row.notifyPath(path, value, true);
+this._instances.forEach(function (inst) {
+inst.notifyPath(path, value, true);
 }, this);
-}
 },
 _forwardItemPath: function (path, value) {
-if (this._rowForKey) {
+if (this._keyToInstIdx) {
 var dot = path.indexOf('.');
 var key = path.substring(0, dot < 0 ? path.length : dot);
-var idx = this._rowForKey[key];
-var row = this.rows[idx];
-if (row) {
+var idx = this._keyToInstIdx[key];
+var inst = this._instances[idx];
+if (inst) {
 if (dot >= 0) {
 path = this.as + '.' + path.substring(dot + 1);
-row.notifyPath(path, value, true);
+inst.notifyPath(path, value, true);
 } else {
-row[this.as] = value;
+inst.__setProperty(this.as, value, true);
 }
 }
 }
 },
-modelForElement: function (el) {
-var model;
-while (el) {
-if (model = el._templateInstance) {
-if (model.dataHost != this) {
-el = model.dataHost;
-} else {
-return model;
-}
-} else {
-el = el.parentNode;
-}
-}
-},
 itemForElement: function (el) {
 var instance = this.modelForElement(el);
 return instance && instance[this.as];
@@ -3549,8 +3824,10 @@ if (this.multi) {
 var scol = Polymer.Collection.get(this.selected);
 var skey = scol.getKey(item);
 if (skey >= 0) {
+if (this.toggle) {
 this.deselect(item);
-} else if (this.toggle) {
+}
+} else {
 this.push('selected', item);
 this.async(function () {
 skey = scol.getKey(item);
@@ -3573,15 +3850,16 @@ extends: 'template',
 properties: {
 'if': {
 type: Boolean,
-value: false
+value: false,
+observer: '_queueRender'
 },
 restamp: {
 type: Boolean,
-value: false
+value: false,
+observer: '_queueRender'
 }
 },
 behaviors: [Polymer.Templatizer],
-observers: ['_queueRender(if, restamp)'],
 _queueRender: function () {
 this._debounceTemplate(this._render);
 },
@@ -3637,7 +3915,7 @@ this._instance = null;
 },
 _wrapTextNodes: function (root) {
 for (var n = root.firstChild; n; n = n.nextSibling) {
-if (n.nodeType === Node.TEXT_NODE) {
+if (n.nodeType === Node.TEXT_NODE && n.textContent.trim()) {
 var s = document.createElement('span');
 root.insertBefore(s, n);
 s.appendChild(n);
@@ -3646,14 +3924,9 @@ n = s;
 }
 },
 _showHideChildren: function () {
-var hidden = this._hideTemplateChildren || !this.if;
+var hidden = this.__hideTemplateChildren__ || !this.if;
 if (this._instance) {
-var c$ = this._instance._children;
-for (var i = 0; i < c$.length; i++) {
-var c = c$[i];
-c.style.display = hidden ? 'none' : '';
-c._hideTemplateChildren = hidden;
-}
+this._instance._showHideChildren(hidden);
 }
 },
 _forwardParentProp: function (prop, value) {
@@ -3700,7 +3973,6 @@ created: function () {
 Polymer.ImportStatus.whenLoaded(this._readySelf.bind(this));
 },
 _registerFeatures: function () {
-this._prepExtends();
 this._prepConstructor();
 },
 _insertChildren: function () {