HTML5 semantic elements

HTML5 offers some new elements, primarily for semantic purposes. The elements include: `section`, `article`, `aside`, `header`, `footer`, `nav`, `figure`, `figcaption`, `time`, `mark` & `main`.

css property: display: `table`, `table-cell`, `table-column`, `table-column-group`, `table-footer-group`, `table-header-group`, `table-row`, and `table-row-group`

html element: footer