This document is a section of the web browser standards support document. It includes detailed information about HTML support in major web browsers.
HTML is the primary language that makes up a webpage. It puts together all of the text, images, scripts, and other content.
In most web browsers, you can view this page's HTML code by going to the View menu and selecting “Page Source” or “Source”.
The following are the elements and attributes that make up the structure of an HTML document.
The attribute collections at the bottom reflect the browser's best support for those attributes. Support may be weaker in some elements. See the specific element information for details.
| Feature | IE 7 | Firefox 2 | Firefox 3 | Opera 9 |
|---|---|---|---|---|
| a | ||||
| (General) | I | I | I | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| accesskey | Y | Y | Y | I |
| charset | Y | Y | Y | Y |
| coords | I | I | I | Y |
| href | Y | Y | Y | Y |
| hreflang | I | Y | Y | I |
| name | I | Y | Y | Y |
| onblur | Y | Y | Y | Y |
| onfocus | Y | Y | Y | Y |
| rel | I | Y | Y | I |
| rev | I | Y | Y | I |
| shape | I | I | I | 90% |
| tabindex | I | Y | Y | Y |
| target | I | I | I | I |
| type | Y | Y | Y | Y |
| abbr | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 50% |
| acronym | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 50% |
| address | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| area | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| accesskey | Y | Y | Y | Y |
| alt | I | Y | Y | Y |
| coords | Y | Y | Y | Y |
| href | Y | Y | Y | Y |
| nohref | Y | Y | Y | Y |
| onblur | Y | Y | Y | Y |
| onfocus | Y | Y | Y | Y |
| shape | 80% | Y | Y | 90% |
| tabindex | Y | Y | Y | Y |
| target | I | I | I | I |
| b | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| base | ||||
| (General) | Y | Y | Y | Y |
| href | Y | Y | Y | Y |
| target | I | I | I | I |
| bdo | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| dir | Y | Y | Y | Y |
| lang | 75% | Y | Y | 75% |
| big | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| blockquote | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| cite | I | Y | Y | I |
| body | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| onload | Y | Y | Y | Y |
| onunload | Y | Y | Y | Y |
| br | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| button | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| accesskey | Y | Y | Y | I |
| disabled | Y | Y | Y | Y |
| name | I | Y | Y | Y |
| onblur | Y | Y | Y | Y |
| onfocus | Y | Y | Y | Y |
| tabindex | I | Y | Y | Y |
| type | 88% | Y | Y | Y |
| value | I | Y | Y | Y |
| caption | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| cite | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| code | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| col | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 63% | 75% | 75% | 75% |
| Event attributes | 50% | 50% | 50% | 50% |
| I18n attributes | 75% | 50% | 50% | 50% |
| Cell alignment attributes | 37% | 50% | 50% | 68% |
| span | Y | Y | Y | Y |
| width | I | Y | Y | I |
| colgroup | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 63% | 75% | 75% | 75% |
| Event attributes | 50% | 50% | 50% | 50% |
| I18n attributes | 75% | 50% | 50% | 50% |
| Cell alignment attributes | 37% | 50% | 50% | 68% |
| span | Y | Y | Y | Y |
| width | I | Y | Y | I |
| dd | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| del | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| cite | I | Y | Y | I |
| datetime | I | Y | Y | I |
| dfn | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| div | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| dl | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| dt | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| em | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| fieldset | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| form | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| accept | Y | Y | Y | Y |
| accept-charset | I | Y | Y | Y |
| action | Y | Y | Y | Y |
| enctype | Y | Y | Y | Y |
| method | Y | Y | Y | Y |
| name | I | Y | Y | Y |
| onreset | Y | Y | Y | Y |
| onsubmit | Y | Y | Y | Y |
| target | I | I | I | I |
| frame | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 50% | 50% | 50% |
| frameborder | 83% | 83% | 83% | 83% |
| longdesc | I | I | I | I |
| marginheight | Y | Y | Y | Y |
| marginwidth | Y | Y | Y | Y |
| name | I | Y | Y | Y |
| noresize | Y | Y | Y | Y |
| scrolling | 88% | Y | Y | Y |
| src | Y | Y | Y | Y |
| frameset | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 50% |
| cols | Y | Y | Y | Y |
| onload | Y | Y | Y | Y |
| onunload | Y | Y | Y | Y |
| rows | Y | Y | Y | Y |
| h1 | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| h2 | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| h3 | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| h4 | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| h5 | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| h6 | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| head | ||||
| (General) | I | Y | Y | Y |
| I18n attributes | Y | Y | Y | Y |
| profile | I | I | I | I |
| hr | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| html | ||||
| (General) | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| i | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| iframe | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| align | Y | 80% | 80% | 80% |
| frameborder | Y | Y | Y | Y |
| height | Y | Y | Y | Y |
| longdesc | I | I | I | I |
| marginheight | Y | Y | Y | Y |
| marginwidth | Y | Y | Y | Y |
| name | I | Y | Y | Y |
| scrolling | 88% | Y | Y | Y |
| src | Y | Y | Y | Y |
| width | Y | Y | Y | Y |
| img | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 50% | Y | Y | 50% |
| alt | Y | Y | Y | Y |
| height | Y | Y | Y | Y |
| ismap | Y | Y | Y | Y |
| longdesc | I | Y | Y | I |
| name | I | Y | Y | Y |
| src | Y | Y | Y | Y |
| usemap | Y | Y | Y | Y |
| width | Y | Y | Y | Y |
| input | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 50% |
| accept | I | I | I | Y |
| accesskey | Y | Y | Y | Y |
| alt | Y | Y | Y | Y |
| checked | Y | Y | Y | Y |
| disabled | Y | Y | Y | Y |
| ismap | Y | Y | Y | Y |
| maxlength | Y | Y | Y | I |
| name | I | Y | Y | Y |
| onblur | Y | Y | Y | Y |
| onchange | Y | I | I | I |
| onfocus | Y | I | I | Y |
| onselect | Y | Y | Y | I |
| readonly | I | I | I | I |
| size | I | I | I | I |
| src | Y | Y | Y | Y |
| tabindex | I | Y | Y | Y |
| type | Y | Y | Y | Y |
| usemap | I | Y | Y | Y |
| value | Y | Y | Y | Y |
| ins | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| cite | I | Y | Y | I |
| datetime | I | Y | Y | I |
| kbd | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| label | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| accesskey | Y | Y | Y | Y |
| for | Y | Y | Y | Y |
| onblur | I | I | I | Y |
| onfocus | I | I | I | Y |
| legend | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| accesskey | Y | Y | Y | I |
| li | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| link | ||||
| (General) | I | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | 75% | 75% | 75% |
| charset | Y | Y | Y | Y |
| href | Y | Y | Y | Y |
| hreflang | I | Y | Y | I |
| media | I | I | I | I |
| rel | I | Y | Y | I |
| rev | I | Y | Y | I |
| target | Y | Y | Y | Y |
| type | Y | Y | Y | Y |
| map | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| name | I | Y | Y | Y |
| meta | ||||
| (General) | Y | Y | Y | Y |
| I18n attributes | 75% | 75% | 75% | 75% |
| content | Y | Y | Y | Y |
| http-equiv | Y | Y | Y | Y |
| name | Y | Y | Y | Y |
| scheme | Y | Y | Y | Y |
| noframes | ||||
| (General) | I | Y | Y | Y |
| Core attributes | 50% | 88% | 88% | 75% |
| Event attributes | 50% | Y | Y | Y |
| I18n attributes | 50% | Y | Y | 75% |
| noscript | ||||
| (General) | I | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 50% |
| Event attributes | 50% | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 50% |
| object | ||||
| (General) | I | Y | Y | Y |
| Core attributes | 63% | 88% | 88% | 88% |
| Event attributes | 55% | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 50% |
| archive | I | I | I | I |
| classid | Y | Y | Y | Y |
| codebase | I | I | I | Y |
| codetype | Y | Y | Y | Y |
| data | I | I | I | Y |
| declare | I | I | I | Y |
| height | Y | Y | Y | Y |
| name | I | Y | Y | Y |
| standby | I | I | I | I |
| tabindex | I | Y | Y | I |
| type | Y | Y | Y | Y |
| usemap | Y | Y | Y | Y |
| width | Y | Y | Y | Y |
| ol | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| optgroup | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 75% |
| Event attributes | 50% | 70% | 70% | 40% |
| I18n attributes | 50% | Y | Y | 50% |
| disabled | I | Y | Y | Y |
| label | Y | Y | Y | Y |
| option | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 75% |
| Event attributes | 50% | 70% | 70% | 40% |
| I18n attributes | 50% | 50% | 50% | 50% |
| disabled | I | Y | Y | Y |
| label | Y | I | I | I |
| selected | Y | Y | Y | Y |
| value | Y | Y | Y | Y |
| p | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| param | ||||
| (General) | I | Y | Y | Y |
| id | Y | Y | Y | Y |
| name | Y | Y | Y | Y |
| type | Y | Y | Y | Y |
| value | Y | Y | Y | Y |
| valuetype | Y | Y | Y | Y |
| pre | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| q | ||||
| (General) | I | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| cite | I | Y | Y | I |
| samp | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| script | ||||
| (General) | Y | Y | Y | Y |
| charset | Y | Y | Y | Y |
| defer | Y | I | I | I |
| src | Y | Y | Y | Y |
| type | Y | Y | Y | Y |
| select | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | 85% |
| I18n attributes | 75% | Y | Y | 50% |
| disabled | Y | Y | Y | Y |
| multiple | Y | Y | Y | Y |
| name | I | Y | Y | Y |
| onblur | Y | Y | Y | Y |
| onchange | Y | Y | Y | I |
| onfocus | Y | Y | Y | Y |
| size | Y | Y | Y | Y |
| tabindex | I | Y | Y | Y |
| small | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| span | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| strong | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| style | ||||
| (General) | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| media | I | I | I | I |
| title | Y | Y | Y | Y |
| type | Y | Y | Y | Y |
| sub | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| sup | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| table | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| border | Y | Y | Y | Y |
| cellpadding | Y | Y | Y | Y |
| cellspacing | Y | I | I | Y |
| frame | Y | Y | Y | Y |
| rules | 92% | Y | Y | Y |
| summary | I | Y | Y | I |
| width | Y | Y | Y | Y |
| tbody | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| Cell alignment attributes | 37% | 68% | 68% | 68% |
| td | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| Cell alignment attributes | 37% | 68% | 68% | 68% |
| abbr | I | I | I | I |
| axis | I | I | I | I |
| colspan | I | Y | Y | I |
| headers | I | I | I | I |
| rowspan | I | Y | Y | Y |
| scope | I | I | I | I |
| textarea | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | 95% | 95% | 95% | 95% |
| I18n attributes | 75% | Y | Y | 75% |
| accesskey | Y | Y | Y | Y |
| cols | Y | Y | Y | Y |
| disabled | Y | Y | Y | Y |
| name | I | Y | Y | Y |
| onblur | Y | Y | Y | Y |
| onchange | Y | Y | Y | Y |
| onfocus | Y | Y | Y | Y |
| onselect | Y | Y | Y | Y |
| readonly | Y | Y | Y | Y |
| rows | Y | Y | Y | Y |
| tabindex | I | Y | Y | Y |
| tfoot | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| Cell alignment attributes | 37% | 68% | 68% | 68% |
| th | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| Cell alignment attributes | 37% | 68% | 68% | 68% |
| abbr | I | I | I | I |
| axis | I | I | I | I |
| colspan | I | Y | Y | I |
| headers | I | I | I | I |
| rowspan | I | Y | Y | Y |
| scope | I | I | I | I |
| thead | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| Cell alignment attributes | 37% | 68% | 68% | 68% |
| title | ||||
| (General) | Y | Y | Y | Y |
| I18n attributes | 75% | 75% | 75% | 75% |
| tr | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| Cell alignment attributes | 37% | 68% | 68% | 68% |
| tt | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| ul | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| var | ||||
| (General) | Y | Y | Y | Y |
| Core attributes | 75% | 88% | 88% | 88% |
| Event attributes | Y | Y | Y | Y |
| I18n attributes | 75% | Y | Y | 75% |
| Core attributes | ||||
| class | Y | Y | Y | Y |
| id | I | Y | Y | Y |
| style | Y | Y | Y | Y |
| title | I | I | I | I |
| Event attributes | ||||
| onclick | Y | Y | Y | Y |
| ondblclick | Y | Y | Y | Y |
| onkeydown | Y | Y | Y | Y |
| onkeypress | Y | Y | Y | Y |
| onkeyup | Y | Y | Y | Y |
| onmousedown | Y | Y | Y | Y |
| onmousemove | Y | Y | Y | Y |
| onmouseout | Y | Y | Y | Y |
| onmouseover | Y | Y | Y | Y |
| onmouseup | Y | Y | Y | Y |
| Internationalization (i18n) attributes | ||||
| dir | Y | Y | Y | Y |
| lang | I | Y | Y | I |
| Cell alignment attributes | ||||
| align | 67% | 83% | 83% | 83% |
| char | N | I | I | I |
| charoff | N | I | I | I |
| valign | 80% | 90% | 90% | 90% |
| SGML inheritance | ||||
| Whitespace handling | I | I | I | I |
| Comments | I | Y | Y | I |
| CDATA Sections | N | N | N | Y |
| RCDATA Sections | N | N | N | N |
| IGNORE Sections | N | Y | Y | Y |
| INCLUDE Sections | N | N | N | N |
| TEMP Sections | N | N | N | N |
| Minimized attribute form | Y | Y | Y | Y |
| Null end tags | N | N | N | N |
| Unclosed tags | N | Y | Y | N |
| Empty start tags | N | N | N | N |
| Empty end tags | N | N | N | N |
The following are features of XHTML 1.0 that are not covered in the sections above.
Many of the changes were simply to make the language syntax more rigid. Aside from the well-formedness requirement, such added restrictions are not listed since they relate mostly to document authorship rather than browser handling, which is covered by well-formedness point.
| Feature | IE 7 | Firefox 2 | Firefox 3 | Opera 9 |
|---|---|---|---|---|
| HTML in XML | ||||
| (General) | N | Y | Y | Y |
| Documents must be well-formed | ||||
| (General) | I | Y | Y | Y |
| Media types | ||||
| application/xhtml+xml | N | Y | Y | Y |
| application/xml | N | Y | Y | Y |
| text/xml | N | Y | Y | Y |
| DTD changes | ||||
| End tag changes | I | I | I | I |
The following are features of XHTML 1.1 that are not covered in the sections above.
| Feature | IE 7 | Firefox 2 | Firefox 3 | Opera 9 |
|---|---|---|---|---|
| rb | ||||
| (General) | N | I | I | I |
| Core attributes | N | 88% | 88% | 75% |
| rbc | ||||
| (General) | N | I | I | I |
| Core attributes | N | 88% | 88% | 75% |
| rp | ||||
| (General) | N | I | I | I |
| Core attributes | N | 88% | 88% | 75% |
| rt | ||||
| (General) | N | I | I | I |
| Core attributes | N | 88% | 88% | 75% |
| rbspan | N | N | N | N |
| rtc | ||||
| (General) | N | I | I | I |
| Core attributes | N | 88% | 88% | 75% |
| ruby | ||||
| (General) | N | I | I | I |
| Core attributes | N | 88% | 88% | 75% |