| Element/Attribute | Support | Notes |
|---|---|---|
| xbl | Yes | XBL subtrees only in a bound document are processed. |
| script-type | No | |
| style-type | No | |
| binding | Yes | |
| extends | Yes | Within the domain. |
| element | Yes | Selectors implementation differs from the Selectors spec. |
| implementation | Yes | |
| src | Yes | Within the domain. |
| template | Yes | |
| apply-author-sheets | No | |
| allow-selectors-through | No | |
| content | Yes | |
| includes | Yes | |
| apply-binding-sheets | No | |
| locked | Yes | |
| inherited | Yes | |
| xbl:attr | Yes | |
| xbl:pseudo | No | |
| xbl:text | Yes | |
| div | Yes | |
| class | Yes | |
| state | Yes | |
| title | No | |
| handlers | Yes | |
| handler | Partial | The handlers are added to the bound element, not to the handlers element. |
| event | Yes | |
| phase | Partial | The capture value is supported. |
| trusted | Yes | |
| propagate | No | |
| default-action | No | |
| button | Yes | |
| click-count | Yes | |
| modifiers | No | |
| key | No | |
| key-location | No | |
| text | No | |
| prev-value | No | |
| new-value | No | |
| attr-name | No | |
| attr-change | No | |
| resources | No | |
| style | Yes | |
| media | No | |
| src | Yes | Within the domain. |
| prefetch | No | |
| src | No | |
| script | Yes | |
| src | Yes | Within the domain. |