ParentNode

ParentNode 接口包含了只能对有子节点的节点（Node）对象有效的方法。

ParentNode 是一个原始接口，不能够创建这种类型的对象；它在 Element、Document 和 DocumentFragment 对象上被实现。

属性

ParentNode.children Read only: Returns a live HTMLCollection containing all objects of type Element that are children of this ParentNode.
ParentNode.firstElementChild Read only: Returns the Element that is the first child of this ParentNode, or null if there is none.
ParentNode.lastElementChild Read only: Returns the Element that is the last child of this ParentNode, or null if there is none.
ParentNode.childElementCount Read only: Returns an unsigned long giving the amount of children that the object has.

There is no inherited or specific and implemented methods.

Specification	Status	Comment
DOM ParentNode.firstElementChild	Living Standard	Splitted the `ElementTraversal` interface in `ChildNode` and `ParentNode`. The `firstElementChild`, `lastElementChild`, and `childElementCount` properties are now defined on the latter. The `Document` and `DocumentFragment` implemented the new interfaces. Added the `children` property. Added the `append()` and `prepend()` methods.
Element Traversal Specification ElementTraversal'	Recommendation	Added the initial definition of its properties to the `ElementTraversal` pure interface and use it on `Element`.

Help improve compatibility tables by filling out this 11 question survey.

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support (on `Element`)	1.0	3.5 (1.9.1)	9.0 [1]	10.0	4.0
Support on `Document` and `DocumentFragment`	29.0	25.0 (25.0)	Not supported	16.0	Not supported
`append()` and `prepend()`	Not supported	Not supported	Not supported	Not supported	Not supported

Feature	Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support (on `Element`)	(Yes)	1.0 (1.9.1)	(Yes)	(Yes)	(Yes)
Support on `Document` and `DocumentFragment`	(Yes)	25.0 (25.0)	Not supported	16.0	Not supported
`append()` and `prepend()`	Not supported	Not supported	Not supported	Not supported	Not supported

[1] Internet Explorer 6, 7 and 8 supported it, but erroneously returns Comment nodes as part of the results.