Horizontal Scroller: Specs & Contract

The source is on the horizontal scroller page. The strip's spec asserts every seam names the x axis; the marquee's two specs prove the chunker as a pure Static class and the marquee as composition, against the marquee's own contract. The scroller's records, which the strip inherits by construction, are on Virtual Scroller: Specs & Contract; the method is on Testing & Invariants.

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