On several of the visual examples of dotted emphasis, the dot placement is too close to the base text.
https://www.w3.org/TR/css-text-decor-3/images/text-emphasis-ja.png
The emboxes of the base text and dotted emphasis glyphs should touch and not overlap. The size of the dotted glyphs' emboxes are normally 50% of those of the base text, although sometimes further scaling of glyphs is necessary for larger dots.