Old Hunminjeongeum-era texts marked a syllable's tone by placing a dot beside it — called bangjeom (방점). Chinese and Japanese texts had a similar practice of placing a dot (圈点) beside a phrase to flag it as important. Where Western typography reaches for italics or bold, the East Asian vertical-writing tradition reached for a dot placed beside the character instead.
Underlines feel natural in Western text; emphasis dots feel natural in East Asian typesetting for a structural reason — an underline tends to visually collide with the dense strokes and descenders of Hangul or Hanzi, while a dot above the character interferes far less.
CSS `text-emphasis-style` supports values like `dot` (●), `circle` (○), `double-circle`, `triangle` (▲), and `sesame` (closest to the historical bangjeom mark); `text-emphasis-position` sets whether marks sit above or below (left/right in vertical writing); `text-emphasis-color` can give the dots their own color. `text-emphasis` is the shorthand for all three.
When to use
Use in place of underlines to emphasize a short Hangul or Hanzi phrase. For Latin text, italics and bold remain the more familiar emphasis tools.