Now open the regular popup menus to the left. Pass over the image. In the last two pages, we have used a different script than our final one. One that omits the statements that we will discuss and add on this page. Point 5, above, demonstrates another important difference between Navigator and Explorer.
Navigator considers the document elements in mathematical abstraction.
It knows the menu element is there, and that it is enclosing the item, making it 'larger,' even though it occupies the same space as the item. As authors, we know the menu element is there. Explorer considers only the elements that occupy the page's two dimensional space. This ability to overlook elements is compensated for by the transference of event handling to contained elements. Scripted correctly, the event handlers can still handle statements meant for the overlooked outer element, as demonstrated by the functions on the previous page.