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| Tag | Attribute | 2.0 | 3.0 | 3.2 | 4.0 | 1.0 | 1.1 | IE | Mosaic | Netscape | Opera | Safari | ||
| Wbr | -- | -- | -- | -- | -- | -- | 1.0 | -- | 1.0 | 2.1-3.6x | 1.0 | |||