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⋮ i.e.: vertical ellipsis -- 3 dots on top of each other. This HTML entity is correctly rendered by my browser (PaleMoon), but the Validator returns this: ----- Line 2, Column 2: cannot generate system identifier for general entity "vellip" ⋮ An entity reference was found in the document, but there is no reference by that name defined. [...] ----- I am not using this entity inside a URL, rather inside the HTML text. This is the page that found this problem: <https://www.darioniedermann.it/sw/mtaopts.html>