| Implemented |
| Will not implement |
| Dangerous attribute/property |
| Present in CSS1 |
| Attribute | Tags | Notes |
|---|---|---|
| CSS | ||
| style | All | Needs CSS parser |
| Questionable | ||
| accesskey | A | May interfere with main interface |
| tabindex | A | May interfere with main interface |
| target | A | Config enabled, only useful for frame layouts |
| Miscellaneous | ||
| datetime | DEL, INS | No visible effect, ISO format |
| rel | A | Largely user-defined, nofollow |
| rev | A | Largely user-defined |
| axis | TD, TH | W3C only: No browser implementation |
| char | COL, COLGROUP, TBODY, TD, TFOOT, TH, THEAD, TR | W3C only: No browser implementation |
| headers | TD, TH | W3C only: No browser implementation |
| scope | TD, TH | W3C only: No browser implementation |
| URI | ||
| cite | BLOCKQUOTE, Q | - |
| DEL, INS | - | |
| href | A | - |
| longdesc | IMG | - |
| src | IMG | Required |
| Transform | ||
| align | CAPTION | - |
| IMG | Near-equiv style 'caption-side', drop left and right | |
| TABLE | Margin-left and margin-right = auto or parent div | |
| HR | Margin-left and margin-right = auto or parent div (disputed, 'text-align' may work) | |
| H1, H2, H3, H4, H5, H6, P | Equivalent style 'text-align' | |
| alt | IMG | Required, insert image filename if non-existant |
| bgcolor | TABLE | Equivalent style 'background-color' (test compat) |
| TR | Equivalent style 'background-color' (test compat) | |
| TD, TH | Equivalent style 'background-color' | |
| border | IMG | No clean way, either set 'border-width' in parent A, custom CSS class ~'nolinkborder' if border=0 |
| clear | BR | Near-equiv style 'clear', transform 'all' into 'both' |
| compact | DL, OL, UL | Boolean, needs custom CSS class |
| dir | BDO | Required, insert ltr (or configuration value) if none |
| height | TD, TH | Near-equiv style 'height', needs px suffix if original was in pixels |
| hspace | IMG | Near-equiv styles 'margin-top' and 'margin-bottom' |
| lang | * | Copy value to xml:lang |
| name | IMG | Turn into ID |
| A | Turn into ID? (not deprecated) | |
| noshade | HR | Boolean, style 'border-style:solid;' |
| nowrap | TD, TH | Boolean, style 'white-space:nowrap;' (not compat with IE5) |
| size | HR | Near-equiv 'width', needs px suffix if original was pixels |
| src | IMG | Required, insert blank or default img if not set |
| start | OL | Poorly supported 'counter-reset', transform may not be desirable |
| type | LI | Equivalent style 'list-style-type', different allowed values though. (needs testing) |
| OL | ||
| UL | ||
| value | LI | Poorly supported 'counter-reset', transform may not be desirable, see ol.start |
| vspace | IMG | Near-equiv styles 'margin-left' and 'margin-right', see hspace |
| width | HR | Near-equiv style 'width', needs px suffix if original was pixels |
| TD, TH | ||
| Name | Notes |
|---|---|
| Standard | |
| background-color | - |
| background | Depends on background-* |
| border | - |
| border-color | - |
| border-style | - |
| border-width | - |
| border-* | - |
| border-*-color | - |
| border-*-style | - |
| border-*-width | - |
| clear | - |
| color | - |
| float | May require layout precautions with clear |
| font | - |
| font-family | CSS validator may complain if fallback font family not specified |
| font-size | - |
| font-style | - |
| font-variant | - |
| font-weight | - |
| letter-spacing | - |
| line-height | - |
| list-style-position | Strange behavior in browsers |
| list-style-type | Well-supported values are: disc, circle, square decimal, lower-roman, upper-roman, lower-alpha and upper-alpha. See also CSS 3. Mostly IE lack of support. |
| list-style | - |
| margin | - |
| margin-* | - |
| padding | - |
| padding-* | - |
| text-align | - |
| text-decoration | No blink (argh my eyes) |
| text-indent | - |
| text-transform | - |
| width | Interesting |
| word-spacing | IE 5 no support |
| Table | |
| border-collapse | - |
| caption-side | - |
| empty-cells | No IE support, possible fix with ? |
| table-layout | - |
| vertical-align | Also applies to others with explicit height |
| Absolute positioning | |
| bottom | Dangerous, must be non-negative |
| left | |
| right | |
| top | |
| clip | - |
| position | - |
| z-index | Dangerous |
| Unknown | |
| background-image | Dangerous |
| background-attachment | Depends on background-image |
| background-position | Depends on background-image |
| cursor | Dangerous but fluffy |
| display | Dangerous but interesting; will not implement list-item, run-in (Opera only) or table (no IE); inline-block has incomplete IE6 support and requires -moz-inline-box for Mozilla. |
| height | Interesting, why use it? |
| list-style-image | Dangerous? |
| max-height | No IE 5/6 |
| min-height | |
| max-width | |
| min-width | |
| orphans | No IE support |
| widows | No IE support |
| overflow | IE 5/6 almost (remove visible if set) |
| page-break-after | IE 5.5/6 and Opera |
| page-break-before | Mostly supported |
| page-break-inside | Opera only |
| quotes | May be dropped from CSS2 |
| visibility | Dangerous |
| white-space | Spotty implementation: pre (no IE 5/6), nowrap (no IE 5), pre-wrap (only Opera), pre-line (no-support). Fixable? |
| Aural | |
| azimuth | - |
| cue | - |
| cue-after | - |
| cue-before | - |
| elevation | - |
| pause-after | - |
| pause-before | - |
| pause | - |
| pitch-range | - |
| pitch | - |
| play-during | - |
| richness | - |
| speak-header | Table related |
| speak-numeral | - |
| speak-punctuation | - |
| speak | - |
| speech-rate | - |
| stress | - |
| voice-family | - |
| volume | - |
| Will not implement | |
| content | Not applicable for inline styles |
| counter-increment | Needs content, Opera only |
| counter-reset | Needs content, Opera only |
| direction | No support |
| outline-color | IE Mac and Opera on outside, Mozilla on inside and needs -moz-outline, no IE support. |
| outline-style | |
| outline-width | |
| outline | |
| unicode-bidi | No support |