The ...formats.html.markup package is intended to be for basic support for creating Content objects such as instances of HtmlTree, StringContent, Entity, etc.

Creation of complex structures is done in the ...formats.html package.

The "odd one out" in the formats.html.markup package is `Table`, which stands out as the one class to import and use javax.lang.model.element.Element. It also has a "backwards" import on the recently-new HtmlIds class to create HtmlId objects.

The package dependence graph would be better/simpler if we move the Table class to the parent package.