Browser font fallback determines the threat. When a page specifies font-family: Arial, Helvetica, sans-serif and a string contains Cyrillic а, the browser checks Arial’s glyph tables, finds Cyrillic coverage, and renders it using Arial’s Cyrillic glyphs — which are pixel-identical to the Latin ones. The CSS font stack you ship determines which column of the danger rate table applies to your users. Arial at 40.8% is a different risk profile from Didot at 19.2%.
The core Cyrillic lowercase confusables are pixel-identical across 30-44 standard fonts:
。51吃瓜对此有专业解读
The Brazilian has seen this before, football has seen this before, and yet why does it feel like nothing ever changes?。关于这个话题，搜狗输入法下载提供了深入分析
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