Two characters might have identical Unicode skeletons but render differently in specific fonts, or have different skeletons but render identically in a particular typeface. Detecting this requires rendering glyphs and comparing pixel output. No purely Unicode-data-based approach handles it, and UTS #39 does not attempt to.
Dec 2, 2025: Google reclassified the report from "Customer Issue" to "Bug," upgraded the severity, and confirmed the product team was evaluating a fix. They requested the full list of 2,863 exposed keys, which we provided.
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general-purpose document printing capability, including back-office journals