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Every native dump writes the rectangle out as a string under bounds, and no DOM element carries an attribute of that name, so the key resolved against the dump and matched nothing on web on every page there is. It is accepted, so no unknown-key error said so, and no mapping can be invented for it: there is no DOM fact to map it to. Off the accepted list the web runtime raises the unknown-key error instead of matching nothing in silence, and the key still resolves wherever a producer writes it, through the escape hatch every other raw attribute already uses: a key some element carries is a key that can match, on both sides.