This image shows a detail of a page in edit mode Source view. At the top is the status message, "Editing Page: For Testing." Below that are the View menu and Page Properties button. Below these is a toolbar with Add Content, Edit, Delete, Cut, and Paste controls. The mouse pointer hovers over the Edit button, and the button is called out. Below the toolbar is the hierarchical list of page components. A Box layout component is selected and called out. Below the list is a breadcrumb list of page components arranged hierarchically, from the page itself down to the currently selected component. In the WYSIWYG portion of the page, the selected Box layout component is outlined in blue.