HTML and CSS Reference
When the user navigates to another page fragment, only the content of the contenthost element
will be replaced—everything else will remain unchanged. Figure 7-5 shows the home screen; the
dashed area indicates the area reserved to the contenthost element, where each successive page will
be loaded and displayed.
FIGURE 7-5 The layout of the home screen.
With this infrastructure set, you are now ready to build the picture gallery.