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HTMLUnknownElement 代表着一个无效的HTML元素，派生自 HTMLElement 接口,，但它没有任何可用的附加属性或方法.
属性
没有特效属性，继承自父级 HTMLElement.
方法
没有指定方法;继承来自父级的属性, HTMLElement.
规范
| 规范 | 状态 | 建议 |
|---|---|---|
| HTML Living Standard HTMLUnknownElement |
Living Standard | 没有修改HTML5. |
| HTML5 HTMLUnknownElement |
Recommendation | 初始定义 |
浏览器兼容性
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 | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |