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这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。
The DocumentOrShadowRoot interface of the Shadow DOM API provides APIs that are shared between documents and shadow roots.
Properties
DocumentOrShadowRoot.activeElement只读- Returns the
elementwithin the shadow tree that has focus. DocumentOrShadowRoot.styleSheets只读- Returns a
StyleSheetListofCSSStyleSheetobjects for stylesheets explicitly linked into, or embedded in a document
Methods
DocumentOrShadowRoot.getSelection()- Returns a
Selectionobject representing the range of text selected by the user, or the current position of the caret. DocumentOrShadowRoot.elementFromPoint()- Returns the topmost element at the specified coordinates.
DocumentOrShadowRoot.elementsFromPoint()- Returns an array of all elements at the specified coordinates.
DocumentOrShadowRoot.caretPositionFromPoint()- Returns a
CaretPositionobject containing the DOM node containing the caret, and caret's character offset within that node.
| Specification | Status | Comment |
|---|---|---|
| DOM DocumentOrShadowRoot |
Living Standard | Initial definition. |
| Shadow DOM DocumentOrShadowRoot |
Obsolete | Implementation in Shadow DOM. |
Browser Compatibility
We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 53.0 | ? | ? | ? | ? |
| Feature | Android | Android Webview | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|---|
| Basic support | 未实现 | 53.0 | ? | ? | ? | ? | ? | 53.0 |