This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Avoid using it and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
document.registerElement() is deprecated in favor of
This page is not complete.
document.registerElement() method registers a new custom element in the browser 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);
- The name of the custom element. The name must contain a dash (-), for example
An object with properties prototype to base the custom element on, and extends, an existing tag to extend. Both of these are optional.
Here is a very simple example:
var Mytag = document.registerElement('my-tag');
Now the new tag is registered in the browser. The
Mytag variable holds a constructor that you can use to create a
my-tag element in the document as follows:
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"); mytag.textContent = "I am a my-tag element.";
|Feature||Android webview||Chrome for Android||Edge mobile||Firefox for Android||Opera Android||iOS Safari||Samsung Internet|
|Basic support||35||35||No||31 — 591||25||No||?|
1. From version 31 until version 59 (exclusive): this feature is behind the
dom.webcomponents.enabled preference (needs to be set to
true) and the
dom.webcomponents.customelements.enabled preference (needs to be set to
true). To change preferences in Firefox, visit about:config.