n=e.removeAttribute;e.removeAttribute=function(e){r.call(this,e,null,n)},e.setAttribute._polyfilled=!0}}function r(e,t,n){e=e.toLowerCase();var r=this.getAttribute(e);n.apply(this,arguments);var o=this.getAttribute(e);this.attributeChangedCallback&&o!==r&&this.attributeChangedCallback(e,r,o)}function o(e){for(var t=0;t<E.length;t++)if(e===E[t])return!0}function i(e){var t=l(e);return t?i(t["extends"]).concat([t]):[]}function a(e){for(var t,n=e["extends"],r=0;t=e.ancestry[r];r++)n=t.is&&t.tag;e.tag=n...

BaseDescriptors={};var disableUpgradePropertySetter;if(settings.disableUpgradeEnabled){disableUpgradePropertySetter=function(property,value){this.__data__[property]=value;};var origAttributeChangedCallback=Polymer.Base.attributeChangedCallback;Polymer.Base.attributeChangedCallback=function(name,oldValue,newValue){if(!this.__hasInitialized&&name==='disable-upgrade'){this.__hasInitialized=true;this._propertySetter=Polymer.Bind._modelApi._propertySetter;this._configValue=Polymer.Base._configValue;t...