E:first-line/E::first-line { sRules }
CSS3將偽對象選擇符(Pseudo-Element Selectors)前面的單個冒號(:)修改為雙冒號(::)用以區別偽類選擇符(Pseudo-Classes Selectors)，但以前的寫法仍然有效。
即E:first-line可轉化為E::first-line
| Selector | IE | Firefox | Chrome | Safari | Opera | iOS Safari | Android Browser | Android Chrome |
|---|---|---|---|---|---|---|---|---|
| Basic Support | 6.0 #1 | 2.0+ | 4.0+ | 3.1+ | 3.5+ | 3.2+ | 2.1+ | 18.0+ |
| 7.0+ | ||||||||
| ::first-letter | 6.0 | |||||||
| 7.0-8.0 #2 | ||||||||
| 9.0+ |