* Clone and add prefixes for at-rule
(rule, prefix)
| 15 | * Clone and add prefixes for at-rule |
| 16 | */ |
| 17 | add(rule, prefix) { |
| 18 | let prefixeds = this.prefixeds(rule) |
| 19 | |
| 20 | if (this.already(rule, prefixeds, prefix)) { |
| 21 | return |
| 22 | } |
| 23 | |
| 24 | let cloned = this.clone(rule, { selector: prefixeds[this.name][prefix] }) |
| 25 | rule.parent.insertBefore(rule, cloned) |
| 26 | } |
| 27 | |
| 28 | /** |
| 29 | * Is rule already prefixed before |