Why DOCTYPE is required in HTML(ANGULAR)?

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If in Angular with AOT , all typescript, HTML and CSS code gets converted into JS after complication, then why we need to mention DOCTYPE in HTML?

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Serhii On

Angular's Ahead-of-Time (AOT) compilation process converts TypeScript, HTML, and CSS code into JavaScript during build time, the DOCTYPE declaration in HTML remains essential for defining the document type, ensuring standards compliance, improving browser compatibility, and facilitating error handling and validation.