Some courses rely on Unicode which often is rendered too small to read, or not rendered at all, depending on which OS and browser you use, and other factors.
Some courses use ad-hoc romanizations not shared across many dictionaries, learning materials, signs for foreigners in the country, etc.
My course uses pictures of the letters in several different fonts: a few "standard" ones, a "modern" one, a "fancy" or "traditional" one, and one designed to be more readable in computer GUIs.
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