shaping: isolation, bdi

Skip if the two sequences to the right have different shapes: ععع ععع.
Skip if the number 2 here appears to the left of the Arabic word: اثنان 2.
Test passes if the three Arabic characters DON'T join, making the two boxes identical.

Assertion: Shaping IS broken across inline box boundaries when isolation occurs.

The middle character of the top box is surrounded by a bdi element. The lower box uses ZWNJ between characters and markup to show the expected outcome.
The first 'skip' directive compares a sequence separated by unstyled span markup to one without. If the displayed results are different this test will always fail, regardless of the styling, and should be skipped.
This test only works if the bdi tag produces isolation in this browser. The 'skip' directive with the number tests that.
The test uses a Noto Naskh Arabic webfont to control variables related to font choice.