| Comment | HTML comment. |
| CommentData | Info associated with hast comments by the ecosystem. |
| Data | Info associated with hast nodes by the ecosystem. |
| Doctype | HTML document type. |
| DoctypeData | Info associated with hast doctypes by the ecosystem. |
| Element | HTML element. |
| ElementContentMap | Registry of all hast nodes that can occur as children of Element. |
| ElementData | Info associated with hast elements by the ecosystem. |
| Literal | Abstract hast node that contains the smallest possible value. |
| Node | Abstract hast node. |
| Parent | Abstract hast node that contains other hast nodes (children). |
| Properties | Info associated with an element. |
| Root | Document fragment or a whole document. |
| RootContentMap | Registry of all hast nodes that can occur as children of Root. |
| RootData | Info associated with hast root nodes by the ecosystem. |
| Text | HTML character data (plain text). |
| TextData | Info associated with hast texts by the ecosystem. |
| Content deprecated | Union of registered hast nodes that can occur in Root. |
| ElementContent | Union of registered hast nodes that can occur in Element. |
| Literals | Union of registered hast literals. |
| Nodes | Union of registered hast nodes. |
| Parents | Union of registered hast parents. |
| RootContent | Union of registered hast nodes that can occur in Root. |