The xsf:taskpane element is a child element of the xsf:xDocumentClass element and is used to specify a form-specific (custom) task pane.
xsf:taskpane has two attributes:
caption ” Specifies the name displayed in the drop-down menu used to select a task pane.
href ” Specifies the URL of an HTML file that contains the HTML code, and any applicable script code, which creates the appearance and functionality of the task pane.