Layout defaults

The HTML5 theme has both form and folder layout defaults.

Form layout defaults

The default rendering of the form is horizontally centered in the browser window and vertically aligned to the top. The sizable window style attribute determines whether the form is stretched to fill the browser:

If sizable="no", the content is not stretchable and the form takes its desired size.
If sizable="yes", the form is stretched to fill the entire browser window.

Folder layout defaults

The size of the folder is determined by the first folder page displayed. If the content of other folders tabs is larger than the first displayed folder, scrollbars are added. If other folder tabs have stretchable items (like tables), then the layout will be stretchable for all folder pages (including the first folder page).

You can set a minimum width and height for a folder by using the minWidth and minHeight presentation styles attributes.