已正式宣告棄用: This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.

Warning: document.registerElement()                       已經被棄用,建議使用               customElements.define().

document.registerElement()                 可以在瀏覽器中註冊一個新的自訂標籤(元素)and returns a constructor for the new element.

Note: This is an experimental technology. The browser you use it in must support Web Components. See Enabling Web Components in Firefox.


var constructor = document.registerElement(tag-name, options);


自訂的標籤名稱需有一個 橫線  ( - ), 例如my-tag.
options 選擇性

An object with properties prototype to base the custom element on, and extends, an existing tag to extend. Both of these are optional.



var Mytag = document.registerElement('my-tag');

現在新的標籤已經在瀏覽器中註冊了. The Mytag variable holds a constructor that you can use to create a my-tag element in the document as follows:

document.body.appendChild(new Mytag());

This inserts an empty my-tag element that will be visible if you use the browser's developer tools. It will not be visible if you use the browser's view source capability. And it won't be visible in the browser unless you add some content to the tag. Here is one way to add content to the new tag:

var mytag = document.getElementsByTagName("my-tag")[0];
mytag.textContent = "I am a my-tag element.";


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