This test ensures that we update the page-wide active modal when an aria-modal element is dynamically added and removed.

PASS: Modal content is not initially accessible.

Un-hiding aria-modal element.
PASS: Background is inaccessible, modal content is accessible.

Re-hiding aria-modal element.
PASS: Background is accessible, modal content is inaccessible.

PASS successfullyParsed is true

TEST COMPLETE