Hebrew Paseq (U+05C0), which maps to lowercase l, scores 0.923 mean SSIM. This is Hebrew punctuation, not a letter, yet it renders as a vertical bar nearly identical to l. Think “paypa׀.com” with Paseq replacing the L. It scores 0.997 in Tahoma, 0.988 in Arial Unicode MS, 0.951 in Microsoft Sans Serif. The scoring surfaces it correctly.
It's worth noting that these benchmarks compare a pure TypeScript/JavaScript implementation of the new API against the native (JavaScript/C++/Rust) implementations of Web streams in each runtime. The new API's reference implementation has had no performance optimization work — the gains come entirely from the design. A native implementation would likely show further improvement.
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This distinction matters for security. The same-font scenario is the dangerous one: a single font that renders both the spoofing character and its Latin target. Cross-font comparisons are closer to what browsers do (supplemental fonts for exotic characters), but the similarity drops significantly.
Here’s a few examples of what a user sees when they delete a passkey:
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