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MacOS renders Unicode up and down arrows in mismatched fonts breaking visual consistency

thefloatingcontinent.com 7 hours ago 5 min read ↗ Original

MacOS displays Unicode up and down arrows using different fonts, causing inconsistent proportions despite identical code point designations.

WHY IT MATTERS

This inconsistency affects UI design and cross-platform rendering, where visual uniformity is often assumed. Engineers relying on Unicode for consistent symbol representation may encounter unexpected behavior in MacOS environments, requiring additional font handling or fallbacks.

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The three things worth knowing

Unicode specifies up and down arrows (U+21E7, U+21E9) as visually identical but mirrored glyphs.

MacOS’s Lucida Grande font only renders the up arrow, forcing the down arrow into a fallback font (STIXGeneral).

The mismatch stems from legacy encoding (Big5) support in Lucida Grande, not intentional Unicode design.

THE CLUSTER

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thefloatingcontinent.com via Lobsters When the Down Arrow is not an Upside-Down Up Arrow (2022) 7 hours Open ↗