Sequence navigation in LMS.
The items within the ordered list with id="sequence-list" are two page tabs with a set of buttons to alternate between the two page tabs.
Without the appropriate role information, screen reader users may be unable to perceive the structure of these elements, and how activating a link will adjust the page.
Developers must fully implement the aria role of "tab", "tablist", and "tabpanel".
The tablist role should be placed on the element with id="sequence-list", the tabs (e.g. id="tab_0") should contain the role of tab, and the div elements they control (which should already contain aria-controls) should receive the role of tabpanel.
The button elements at the end should either be removed entirely if they simply duplicate the actions of the tab elements. Alternatively, adding an aria-describedby attribute to more fully explain what function these buttons serve may be one accessible option for these controls.
Hiding prev and next buttons in the header for screenreaders
Make sure focus still work correctly - buttons should not be focusable
Add aria roles of "tab", "tablist", and "tabpanel" to correct elements related to sequential nav