Key bindings for the Math Explorer

The table below is an overview of all keybindings available for the interactive Math Explorer. It is divided into three parts:

essential keys,
keys for advanced navigation options, and
special keys for navigating in tables.

For additional information and details see also:

The release notes for the MathJax Accessibility Extension.
The README at github which contains more details on how to run the explorer and in particular provides a support matrix by operating system, browser and screen reader.

	Essential Keys
`Shift`+`Space`	Activate explorer. Requires focus on maths expression. NOTE: Depending on the implementation quality of the particular browser/screenreader/OS combination (especially Chrome and IE), users might have to disable screenreader reading modes (e.g., "browse mode" in NVDA, "virtual cursor" in JAWS) before being able to launch the application.
`Escape`	Leave exploration mode. NOTE: When restarted, the application will continue where the user left off.

`Down`	Explore next lower level of the formula by moving down in the sub-expression tree. Exploration will start at the left-most sub-expression on the level.
`Up`	Move up the sub-expression tree.
`Right`	Navigate the expression horizontally by moving to the next sub-expression on the current level.
`Left`	Navigate the expression horizontally by moving to the previous sub-expression on the current level.
	An earcon is played as indicator that the boundary of an expression has been reached in either direction.

	Advanced Options
`Tab`	Repeat previous speech-text or announcement.
`Space`	Get positional information, i.e., the current level in the sub-expression tree as well as collapsibility/expandability of the current subexpression.
`Enter`	Collapse or expand expression under cursor, if possible. Speech-text is regenerated to match.
`Home`	Navigate directly to top-most level of expression.
`X`	Summarise the expression under cursor, without collapsing it.
`Z`	Give detailed description of expression under cursor, without expanding it.
`V`	Start new virtual cursor from the current position.
`P`	Go to last position or previous virtual cursor
`U`	Undo all virtual cursors, i.e. go to position where first virtual cursor was started.

	Special key combinations for navigating tables
`Shift`+ `Down`	Move one cell vertically down in the table.
`Shift`+ `Up`	Move one cell vertically up in the table.
`Shift`+ `Right`	Move one cell horizontally right in the table.
`Shift`+ `Left`	Move one cell horizontally left in the table.

`0-9`+`0-9`	Move directly to cell (n,m) if it exists. (0,0) is cell (10,10).