| Main Index | Element Tree | Element Index | Browser Timelines | Support Page Notations |
| %Core% Attributes: Class | ID | Style |
| HTML | XHTML | Browsers | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Element | 2.0 | 3.0 | 3.2 | 4.0 | 1.0 | 1.1 | Internet Explorer |
Netscape | Opera |
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| A Href | -- | X | -- | X | X | X | 3.0 | 4.0B3 | 3.5 |
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| A Name | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Abbr | -- | -- | -- | X | X | X | -- | 6.0 | 4.0 |
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| Acronym | -- | -- | -- | X | X | X | 4.0 | 6.0 | 4.0 |
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| Address | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Applet | -- | -- | -- | X | X | -- | 4.0 | 4.0 | -- |
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| Area | -- | -- | -- | X | X | X | -- | -- | -- |
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| B | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Basefont | -- | -- | -- | -- | -- | -- | 3.0 | 4.0B5-4.x | -- |
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| Bdo | -- | -- | -- | X | X | X | 5.0 | 6.0 | 4.0 |
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| Big | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Blink | -- | -- | -- | -- | -- | -- | 4.0B1 | 4.0B2 | 7.2 |
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| Blockquote | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Body | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Br | -- | X | -- | X | X | X | 5.0 | 4.0 | 3.5 |
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| Button | -- | -- | -- | X | X | X | 4.0B1 | 6.0 | 5.0 |
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| Caption | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 4.0 |
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| Center | -- | -- | -- | X | X | -- | 3.0 | 4.0B2 | 3.5 |
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| Cite | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Code | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Col | -- | -- | -- | X | X | X | 4.0B1 | -- | 7.0 |
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| Colgroup | -- | -- | -- | X | X | X | 4.0B1 | -- | 7.0 |
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| Dd | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Del | -- | X | -- | X | X | X | 4.0 | 6.0 | 4.0 |
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| Dfn | -- | X | -- | X | X | X | 3.0 | 6.0 | 3.5 |
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| Dir | -- | X | -- | X | X | -- | 3.0 | 4.0B2 | 3.5 |
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| Div | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Dl | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Dt | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Em | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Fieldset | -- | -- | -- | X | X | X | 4.0B2 | 6.0 | 4.0 |
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| Font | -- | -- | -- | X | X | -- | 3.0 | 4.0B2 | 3.5 |
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| Form | -- | -- | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Frame | -- | -- | -- | X | X | -- | 4.0 | -- | -- |
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| Frameset | -- | -- | -- | X | X | -- | 4.0 | 6.0 | -- |
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| Head | -- | -- | -- | -- | -- | -- | 4.0 | -- | -- |
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| Hr | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Html | -- | X | -- | -- | -- | -- | 4.0 | 4.0 | 7.2 |
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| Heading | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| I | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Iframe | -- | -- | -- | X | X | -- | 4.0 | 6.0 | 4.0 |
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| Ilayer | -- | -- | -- | -- | -- | -- | -- | 4.0B2-4.x | -- |
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| Img | -- | X | -- | X | X | X | 4.0B1 | 6.0 | 3.5 |
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| Input Type=Button | -- | -- | -- | X | X | X | 4.0 | 4.0 | 4.0 |
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| Input Type=Checkbox | -- | X | -- | X | X | X | 4.0 | 4.0 | 4.0 |
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| Input Type=File | -- | X | -- | X | X | X | 4.0 | 4.0 | 4.0 |
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| Input Type=Hidden | -- | X | -- | X | X | X | -- | -- | -- |
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| Input Type=Image | -- | X | -- | X | X | X | 4.0 | 4.0 | 3.5 |
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| Input Type=Password | -- | X | -- | X | X | X | 4.0 | 4.0 | 4.0 |
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| Input Type=Radio | -- | X | -- | X | X | X | 4.0 | 4.0 | 4.0 |
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| Input Type=Reset | -- | X | -- | X | X | X | 4.0 | 4.0 | 4.0 |
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| Input Type=Submit | -- | X | -- | X | X | X | 4.0 | 4.0 | 4.0 |
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| Input Type=Text | -- | X | -- | X | X | X | 4.0 | 4.0 | 4.0 |
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| Ins | -- | X | -- | X | X | X | 4.0 | 6.0 | 4.0 |
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| Isindex | -- | -- | -- | X | X | -- | 4.0 | 4.0B5 | 4.0 |
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| Kbd | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Label | -- | -- | -- | X | X | X | 4.0B1 | 6.0 | 4.0 |
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| Layer | -- | -- | -- | -- | -- | -- | -- | 4.0B2-4.x | -- |
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| Legend | -- | -- | -- | X | X | X | 4.0B2 | 6.0 | 4.0 |
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| Li | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Link | -- | -- | -- | X | X | X | -- | -- | -- |
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| Listing | -- | -- | -- | -- | -- | -- | 3.0 | 4.0B2-4.x | 3.5 |
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| Map | -- | -- | -- | X | X | X | 4.0 | 6.0 | 5.0 |
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| Marquee | -- | -- | -- | -- | -- | -- | 3.0 | 6.0 | 3.5 |
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| Menu | -- | X | -- | X | X | -- | 3.0 | 4.0B2 | 3.5 |
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| Multicol | -- | -- | -- | -- | -- | -- | -- | 4.0B2-4.x | -- |
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| Nobr | -- | -- | -- | -- | -- | -- | 3.0 | 4.0B2 | 3.5 |
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| Noframes | -- | -- | -- | X | X | -- | -- | 4.0 | 3.5 |
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| Noscript | -- | -- | -- | X | X | X | 4.0 | -- | -- |
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| Object | -- | -- | -- | X | X | X | 4.0 | 6.0 | 4.0 |
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| Ol | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Optgroup | -- | -- | -- | X | X | X | 6.0 | 6.0 | -- |
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| Option | -- | X | -- | X | X | X | 4.0B2 | 6.0 | -- |
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| P | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Plaintext | -- | -- | -- | -- | -- | -- | 3.0 | 4.0B2 | 3.5 |
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| Pre | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Q | -- | -- | -- | X | X | X | 4.0 | 6.0 | 4.0 |
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| Rb | -- | -- | -- | -- | -- | X | -- | -- | -- |
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| Rbc | -- | -- | -- | -- | -- | X | -- | -- | -- |
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| Rp | -- | -- | -- | -- | -- | X | -- | -- | -- |
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| Rt | -- | -- | -- | -- | -- | X | 5.0B2 | -- | -- |
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| Rtc | -- | -- | -- | -- | -- | X | -- | -- | -- |
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| Ruby | -- | -- | -- | -- | -- | X | 5.0B2 | -- | -- |
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| S | -- | X | -- | X | X | -- | 3.0 | 4.0B2 | 3.5 |
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| Samp | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Select | -- | X | -- | X | X | X | 4.0B1 | 6.0 | 4.0 |
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| Small | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Span | -- | -- | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Strike | -- | -- | -- | X | X | -- | 3.0 | 4.0B2 | 3.5 |
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| Strong | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Sub | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Sup | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Table | -- | X | -- | X | X | X | 3.0 | 4.0 | 3.5 |
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| Tbody/Tfoot/Thead | -- | -- | -- | X | X | X | 4.0B1 | 6.0 | 6.0 |
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| Td/Th | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Textarea | -- | X | -- | X | X | X | 4.0B1 | 6.0 | 4.0 |
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| Tr | -- | X | -- | X | X | X | 3.0 | 6.0 | 3.5 |
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| Tt | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| U | -- | X | -- | X | X | -- | 3.0 | 4.0B2 | 3.5 |
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| Ul | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Var | -- | X | -- | X | X | X | 3.0 | 4.0B2 | 3.5 |
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| Wbr | -- | -- | -- | -- | -- | -- | 4.0 | -- | -- |
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| Xmp | -- | -- | -- | -- | -- | -- | 3.0 | 4.0B2 | 3.5 |
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