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Element.prefix 只读属性返回指定元素的命名空间前缀，如果未指定前缀，则返回null。
在DOM4之前，该API是在 Node interface 中定义的。
Syntax
string = element.prefix
Examples
The following logs "x" to the console.
<x:div onclick="console.log(this.prefix)"/>
Notes
This will only work when a namespace-aware parser is used, i.e. when a document is served with an XML MIME type. This will not work for HTML documents.
Specifications
| Specification | Status | Comment |
|---|---|---|
| DOM4 Element.prefix |
Recommendation | Initial definition |
Browser compatibility
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 46.0[1] | (Yes) | 48.0 (48.0)[1] | ? | (Yes) | ? |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | ? | (Yes) | 48.0 (48.0)[1] | ? | ? | ? |
[1] This API was previously available on the Node API.