An interesting feature of the HTML markup are <rp> tags designed to add parentheses or other fallback rendering for browsers old that don’t understand the ruby tags.
In similar spirit, whatever syntax extension you invent for markdown, many markdown converters will not understand it, and likely dump the syntax as-is to the output. Is that a consideration? Which, if any, of these syntaxes are acceptable fallbacks? For example the caret in syntaxes like “[図書館]^(としょかん)”, while is has a nice geeky meanins, probably looks silly if dumped as-is to the output?
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