exploring ligatures: font size 120%

Skip if the two sequences to the right have different shapes: ععع ععع.
Test passes if the three Arabic characters don't join, or styling is applied to the glyph corresponding to the middle letter, or the styling is applied to the whole ligature.

Assertion: [exploratory] Styling part of a ligature for font-size will break joining behaviour across inline box boundaries, or apply the styling to the glyph corresponding to the middle letter, or apply the styling to the whole ligature.

The middle character in the box is surrounded by a span element to which the CSS style "font-size:120%" is applied.
The '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.
The test uses a Noto Naskh Arabic webfont to control variables related to font choice.