Google Chrome 69.0.3494.0 (Official Build) dev (64-bit), Firmware Version	Google_Eve. 9584.160.0

Steps to reproduce: 
# Flip convertible ChromeVox into tablet mode
# Turn on ChromeVox by holding both hardware volume keys for 5 seconds 
# Load a page with plenty of whitespace like Google search results
# Tap anywhere in a blank area of the page
Expected: focus moves to entire window, nothing read, perhaps an earcon plays
Actual: ChromeVox keeps itself on a focusable area at all times so if I touch an area with nothing that can be focused ChromeVox will find something nearby to focus on and read even if it is nowhere near the location of my finger