Heydon Pickering 12/30/2025

Leveraging The Super Keyword In Custom Elements

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This technical article clarifies the proper use of the 'super' keyword in JavaScript's class-based custom elements. It debunks the common but misleading advice to always call 'super()' first in a constructor, explaining when it's actually necessary. The article provides practical examples of using 'super' in constructors, lifecycle methods like connectedCallback, and for inheriting static properties like observedAttributes, promoting efficient code reuse through inheritance.

Leveraging The Super Keyword In Custom Elements

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