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| Tag | Attribute | 2.0 | 3.0 | 3.2 | 4.0 | Internet Explorer |
Mosaic | Netscape | |
|---|---|---|---|---|---|---|---|---|---|
| H1-H6 | X | X | X | X | 1.0 | 1.0 | 1.0 | ||
| %Core% | -- | X | -- | X | 3.0 | -- | 4.0B2 | ||
| %Events% | -- | -- | -- | X | 4.0B1 | -- | -- | ||
| %Language% | -- | X | -- | X | X?? | -- | -- | ||
| Align | -- | X | X | X | 1.0 | 2.0B4 | 1.0 | ||
| H7 | -- | -- | -- | -- | -- | 1.0 | -- | ||
| Head | X | X | X | X | 1.0 | 1.0 | 1.0 | ||
| %Language% | -- | -- | -- | X | -- | -- | -- | ||
| Profile | -- | -- | -- | X | -- | -- | -- | ||
| Hr | X | X | X | X | 1.0 | 1.0 | 1.0 | ||
| %Core% | -- | X | -- | X | 3.0 | -- | 4.0B2 | ||
| %Events% | -- | -- | -- | X | 4.0B1 | -- | -- | ||
| Align | -- | -- | X | X | 1.0 | 2.0FB | 1.0 | ||
| Color | -- | -- | -- | -- | 3.0A1 | -- | -- | ||
| Noshade | -- | -- | X | X | 1.0 | 2.0FB | 1.0 | ||
| Size | -- | -- | X | X | 1.0 | 2.0FB | 1.0 | ||
| Width | -- | -- | X | X | 1.0 | 2.0FB | 1.0 | ||
| HTML | X | X | X | X | 1.0 | 1.0 | 1.0 | ||
| %Language% | -- | -- | -- | X | -- | -- | -- | ||