At a user's suggestion, I added the lang="ja" attribute to the "found_kanji" div element at https://kanji.sljfaq.org/. Apparently some systems don't show it correctly and think it is Chinese without that.
I've updated WWW::LinkRot.
Some of the links had gone dead, e.g. http to https and so on, and others had moved without a redirect, particularly the w3schools ones.
I've changed over to use CSS grids instead of tables. The results look quite nice I think.
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