Index - B
| background | Yi.Style |
| Backward | Yi.Buffer.Basic |
| baseAttributes | Yi.Style |
| black | Yi.Style |
| blockCommentStyle | Yi.Style |
| blue | Yi.Style |
| bold | Yi.Style |
| brightwhite | Yi.Style |
| brown | Yi.Style |
| BufferRef | |
| 1 (Type/Class) | Yi.Buffer.Basic |
| 2 (Data Constructor) | Yi.Buffer.Basic |
| builtinStyle | Yi.Style |
| Byte | Yi.Lexer.Alex |