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| Tag | Attribute | 2.0 | 3.0 | 3.2 | Internet Explorer |
Mosaic | Netscape | |
|---|---|---|---|---|---|---|---|---|
| Em | X | X | X | 1.0 | 2.0A3 | 1.0 | ||
| Class | -- | X | -- | 3.0B1 | -- | 4.0B2 | ||
| ID | -- | X | -- | 3.0B1 | -- | 4.0B2 | ||
| Style | -- | -- | -- | 3.0B1 | -- | 4.0B3 | ||
| Embed | -- | -- | -- | 3.0B2 | -- | 1.1 | ||
| Class | -- | -- | -- | 3.0B1 | -- | 4.0B2 | ||
| Height | -- | -- | -- | 3.0B2 | -- | 1.1 | ||
| ID | -- | -- | -- | 3.0B1 | -- | 4.0B2 | ||
| Src | -- | -- | -- | 3.0B2 | -- | 1.1 | ||
| Style | -- | -- | -- | 3.0B1 | -- | 4.0B3 | ||
| Width | -- | -- | -- | 3.0B2 | -- | 1.1 | ||