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| HTML | XHTML | Browsers | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tag | Attribute | 2.0 | 3.0 | 3.2 | 4.0 | 1.0 | 1.1 | IE | Mosaic | Netscape | Opera | Safari | ||
| Q | -- | X | -- | X | X | X | 4.0* | -- | 6.0B1 | 4.0 | 1.0 | |||
| %Core% | -- | X | -- | X | X | X | 4.0 | -- | 6.0B1 | 4.0 | 1.0 | |||
| %Accessibility% | -- | -- | -- | X | X | X | 4.0B1 | -- | 6.0 | 5.0 | 1.2 | |||
| %Events% | -- | -- | -- | X | X | X | 4.0 | -- | 6.0B1 | 4.0 | 1.0 | |||
| %Language% | -- | X | -- | X | X | X | 4.0 | -- | -- | -- | -- | |||
| %Editing% | -- | -- | -- | -- | -- | -- | 5.5 | -- | -- | -- | -- | |||
| Cite | -- | -- | -- | X | X | X | -- | -- | 6.1 | -- | -- | |||