abs are created with an H1 header. If a page has three H1 headers, then there will be three tabs. The content for a tab are all the blocks that follow a H1 header until there is another H1 header or the end of the page is reached.
Content that comes before the first H1 header is not placed into a tab. Currently, there is no way to place content after the tabs.
The layout and style of the tabs and their respective contents can be modified using CSS.
