what is shadow DOM? what are synthetic Events? What is UNIT testing?

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Shadow DOM is a way to encapsulate the styling and structure of a web component, synthetic events are events created by the browser to mimic real events, and unit testing is a method to test individual units or components of a software.

Shadow DOM allows for scoped styles and markup within a web component.
Synthetic events are events like 'click' or 'change' that are created by the browser to simulate user interactions.
Unit testing involves testing individual units or components of a software in isolation to ensure they work correctly.
Example: Shadow DOM can be used to create custom elements with encapsulated styles and markup.
Example: Synthetic events can be triggered programmatically to simulate user interactions for testing purposes.
Example: Unit testing can be done using frameworks like Jest or Mocha to test individual functions or components.

what is shadow DOM? what are synthetic Events? What is UNIT testing?

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