| Attributes |
| Name | Required | Request-time | Type | Description |
| collapsible | false | true | boolean | Whether the panel can be collapsed. The default value is true. |
| cssClass | false | true | java.lang.String | A CSS class for styling the component. |
| defaultState | false | true | java.lang.String | A default state for the component. Possible values are open and any string other than open. Any string other than open collapses the panel. The default value is open. |
| extended | false | true | boolean | Whether the panel is extended. The default value is false. |
| helpMessage | false | true | java.lang.String | Text to display as a help tool tip on mouse over of the panel's help icon. |
| iconCssClass | false | true | java.lang.String | An icon to display next to the panel's title. The icon can be specified using the name of one of the Bootstrap icon CSS classes found at http://marcoceppi.github.io/bootstrap-glyphicons/. |
| id | false | true | java.lang.String | An ID for the component instance. |
| markupView | false | true | java.lang.String | Deprecated as of 7.4.0, with no direct replacement. |
| parentId | false | true | java.lang.String | The ID of the component that contains the panel. If a liferay-ui:panel-container is used as the container for the panel, its ID is used as the value for the parentID. |
| persistState | false | true | boolean | Whether to remember the component's state and persist it to the database. The default value is false. |
| state | false | true | java.lang.String | A state for the component. Possible values are open and any string other than open. Any string other than open collapses the panel. |
| title | true | true | java.lang.String | A title to display at the top of the panel. |