code: function() {
      this.setColour(160);
      var src = 'https://www.gstatic.com/codesite/ph/images/star_on.gif';
      this.appendDummyInput()
          .appendField('image')
          .appendField(new Blockly.FieldTextInput(src), 'SRC');
      this.appendDummyInput()
          .appendField('width')
          .appendField(new Blockly.FieldTextInput('15',
              Blockly.FieldTextInput.numberValidator), 'WIDTH')
          .appendField('height')
          .appendField(new Blockly.FieldTextInput('15',
              Blockly.FieldTextInput.numberValidator), 'HEIGHT')
          .appendField('alt text')
          .appendField(new Blockly.FieldTextInput('*'), 'ALT');
      this.setPreviousStatement(true, 'Field');
      this.setNextStatement(true, 'Field');
      this.setTooltip('Static image (JPEG, PNG, GIF, SVG, BMP).\n' +
                      'Retains aspect ratio regardless of height and width.\n' +
                      'Alt text is for when collapsed.');
      this.setHelpUrl('https://www.youtube.com/watch?v=s2_xaEvcVI0#t=567');
    }
docs: Image.