Instance ID

instanceID is a unique identifier that is generated per Custom Element instance. This enables you to differentiate between multiple instances of the same element on a page. It can also be useful when using a string based diffing library like Morphdom which keys on unique identifiers to know when to update versus replace an element.

export default function MyCard({ html, state }) {
  const { attrs={}, instanceID='' } = state
  const { content='', heading='' } = attrs

  return html`
<figure id="figure-${instanceID}">
Pro tip: As in the example above, prefix the id with the element name in order to use the id with multiple child elements.

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