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CustomStateSet: has() method - Web APIs

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1. Web
2. Web APIs
3. CustomStateSet
4. has()

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• Syntax
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1. Web Components
2. CustomStateSet
3. Instance properties
   1. size
4. Instance methods
   1. add()
   2. clear()
   3. delete()
   4. entries()
   5. forEach()
   6. has()
   7. keys()
   8. values()
5. Related pages for Web Components
   1. CustomElementRegistry
   2. Document.createElement()
   3. Element.attachShadow()
   4. Element.shadowRoot
   5. Element.slot
   6. ElementInternals
   7. Event.composed
   8. Event.composedPath
   9. HTMLElement.attachInternals()
   10. HTMLSlotElement
   11. HTMLTemplateElement
   12. Node.getRootNode()
   13. Node.isConnected
   14. ShadowRoot
   15. Window.customElements

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Baseline 2024

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The has() method of the CustomStateSet interface returns a Boolean asserting whether an element is present with the given value.

js

has(value)

value

The value to test for in the CustomStateSet object.

A Boolean, true if value exists in the CustomStateSet.

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This page was last modified on Mar 26, 2024 by MDN contributors.

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