text: 
  
      Polymer({
  
        is: 'iron-icon',
  
        properties: {
  
          /**
           * The name of the icon to use. The name should be of the form:
           * `iconset_name:icon_name`.
           */
          icon: {
            type: String,
            observer: '_iconChanged'
          },
  
          /**
           * The name of the theme to used, if one is specified by the
           * iconset.
           */
          theme: {
            type: String,
            observer: '_updateIcon'
          },
  
          /**
           * If using iron-icon without an iconset, you can set the src to be
           * the URL of an individual icon image file. Note that this will take
           * precedence over a given icon attribute.
           */
          src: {
            type: String,
            observer: '_srcChanged'
          }
        },
  
        _DEFAULT_ICONSET: 'icons',
  
        _iconChanged: function(icon) {
          var parts = (icon || '').split(':');
          this._iconName = parts.pop();
          this._iconsetName = parts.pop() || this._DEFAULT_ICONSET;
          this._updateIcon();
        },
  
        _srcChanged: function(src) {
          this._updateIcon();
        },
  
        _usesIconset: function() {
          return this.icon || !this.src;
        },
  
        _updateIcon: function() {
          if (this._usesIconset()) {
            if (this._iconsetName) {
              this._iconset = this.$.meta.byKey(this._iconsetName);
              if (this._iconset) {
                this._iconset.applyIcon(this, this._iconName, this.theme);
              } else {
                this._warn(this._logf('_updateIcon', 'could not find iconset `'
                  + this._iconsetName + '`, did you import the iconset?'));
              }
            }
          } else {
            if (!this._img) {
              this._img = document.createElement('img');
              this._img.style.width = '100%';
              this._img.style.height = '100%';
            }
            this._img.src = this.src;
            Polymer.dom(this.root).appendChild(this._img);
          }
        }
  
      });
  
    