Function: showBackground() Description: restores background content to the accessibility tree so that screen reader users can once again perceive it during navigation. Returns: domElement, or $A object if chained. Note: The showBackground() function has no impact on visual layout, but will instead restore background content that was previously hidden from non-sighted screen reader users via the hideBackground() function. Example: // Restore the background content so that it is once again perceivable and navigable for non-sighted screen reader users. $A.showBackground();