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Custom Element is a web component concept that defines a reusable browser-native HTML element.
Custom Element matters because custom elements help share UI across frameworks but require clear API and lifecycle boundaries. It gives builders a precise word for the thing they are changing, debugging, reviewing, or shipping.
Plainly
Think of Custom Element as a named piece of the app screen or browser toolbox. It gives one small job a clear name so the whole app is easier to understand.
In practice
Use it when checking how users interact with the page or how browser code behaves. In practice, name the owner, input, output, failure mode, and proof before relying on Custom Element.