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Remarks
Parameters (comma-separated): Value, Mode, Scale, Leading — all optional. Mode: content (grow to the tallest font on the line — default), primary (primary font only, so fallback glyphs never enlarge the line), or scaled (exactly Scale × fontSize). Value: optional nudge on top of the mode — 150% or 1.5em (multiplier), 40 (absolute pixels), +10 / -5 (delta pixels). A bare number is pixels, not a multiplier; 0 or empty means no nudge. Scale: the multiplier for scaled mode; ignored otherwise. Leading: how extra spacing is split — halfLeading (CSS), leadingAbove (Figma), leadingBelow (Android). To set a later parameter without the earlier ones, leave them empty: <lh=,primary>, <lh=,scaled,2>. When several ranges set an absolute height on a line, the largest wins.