Prerequisites: A Hebrew font.
BDI: neutral when nested
Test passes if the two boxes below look exactly the same.
א + [a + [ב + [b + 4] + 3] + 2] + 1
א + [a + [ב + [b + 4] + 3] + 2] + 1
א + [a + [ב + [b + 4] + 3] + 2] + 1
a + [א + [b + [ב + 3] + 2] + 1] + 0
a + [א + [b + [ב + 3] + 2] + 1] + 0
a + [א + [b + [ב + 3] + 2] + 1] + 0
1 + [a + [3 + [b + 4] + ב] + 2] + א
1 + [a + [3 + [b + 4] + ב] + 2] + א
1 + [a + [3 + [b + 4] + ב] + 2] + א
a + [1 + [b + [3 + ב] + 2] + א] + 0
a + [1 + [b + [3 + ב] + 2] + א] + 0
a + [1 + [b + [3 + ב] + 2] + א] + 0
Assertion: 'For the purposes of applying the bidirectional algorithm to the paragraph-level container that a bdi element finds itself within, the bdi element must be treated like a U+FFFC OBJECT REPLACEMENT CHARACTER.' This must apply when a BDI is nested within a BDI.