Compare two PPTX decks — structurally (shape by shape, with exact EMU/point numbers), by rendered pixels, or by dumping a single slide. Apply when aligning a deck generator against a hand-made reference, when checking a rebuilt deck against the previously committed one for regressions, or when reading exact values off someone else's slide. Triggers on requests to compare, diff or verify presentations, or when told to use "pptx-compare".
