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The `super` keyword in custom elements extends beyond just calling it first in constructors. You don't need to invoke the constructor at all unless adding to it. The `super` keyword can be used outside constructors to call parent methods like `connectedCallback()`, and `super.observedAttributes` with spread syntax avoids redeclaring inherited attributes. This approach leverages inheritance to reduce code duplication and simplify maintenance of custom element libraries.

Leveraging The Super Keyword In Custom Elements