Custom Elements (deprecated V0 spec)
Original V0 version of the custom elements specification. See [Custom Elements V1](#feat=custom-elementsv1) for support for the latest version.
Custom Elements (V1)
One of the key features of the Web Components system, custom elements allow new HTML tags to be defined.
dataset & data-* attributes
Method of applying and accessing custom data to elements.
window api: customelements
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