| beginPath | JavaScript.Web.Canvas |
| bezierCurveTo | JavaScript.Web.Canvas |
| BinaryType | JavaScript.Web.WebSocket |
| Blob | |
| 1 (Type/Class) | JavaScript.Web.Blob.Internal, JavaScript.Web.Blob |
| 2 (Data Constructor) | JavaScript.Web.WebSocket |
| BlobData | JavaScript.Web.MessageEvent |
| BlobType | JavaScript.Web.Blob.Internal |
| BlobTypeBlob | JavaScript.Web.Blob.Internal |
| BlobTypeFile | JavaScript.Web.Blob.Internal |
| BlobVal | JavaScript.Web.XMLHttpRequest |
| Bool | JavaScript.JSON.Types.Internal |
| Boolean | GHCJS.Foreign.Internal, GHCJS.Foreign |
| boolValue | JavaScript.JSON.Types.Internal |
| Bottom | JavaScript.Web.Canvas |
| break | Data.JSString |
| breakOn | Data.JSString |
| breakOnAll | Data.JSString |
| breakOnAll' | Data.JSString |
| breakOnEnd | Data.JSString |
| Buffer | GHCJS.Buffer.Types, GHCJS.Buffer |
| buffer | JavaScript.TypedArray.Internal, JavaScript.TypedArray, JavaScript.TypedArray.ST |
| build | JavaScript.Array.ST |
| byteLength | |
| 1 (Function) | JavaScript.TypedArray.ArrayBuffer |
| 2 (Function) | JavaScript.TypedArray.Internal, JavaScript.TypedArray, JavaScript.TypedArray.ST |
| 3 (Function) | GHCJS.Buffer |
| byteOffset | JavaScript.TypedArray.Internal, JavaScript.TypedArray, JavaScript.TypedArray.ST |