BDI: neutral to immediately preceding letter

Test passes if the two boxes are identical.

אב...
אב...
אב...
ab...
ab...
ab...
‭אב...‬
‭אב...‬
‭אב...‬
‭...ba‬
‭...ba‬
‭...ba‬

'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.'

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HTML5

the-dir-attribute-090
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Assumptions: