| Description | Contains the message that is displayed when users are prompted for input. |
| Type | Specifies the content type of a placeholder. This attribute is mandatory. The defined values are: -image: placeholder can be replaced by an image. -object: placeholder can be replaced by an object. -table: placeholder can be replaced by a table. -text: placeholder can be replaced by text. -text-box: placeholder can be replaced by a text-box. |
| Value | Contains placeholder. |