It's HTML Doctype: What is it?
The HTML version that the page is using is indicated to the browser by DOCTYPE.
It aids in the proper display of the page by the browser.
👉 Doctype is a browser instruction, not an HTML tag.
🧠 Why Is Doctype Important?
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🌍 guarantees accurate rendering across all browsers
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🛑 Prevents unexpected layout problems, or "quirks mode."
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✅ Ensures that your page complies with web standards
Browsers may behave differently without Doctype 😵💫.
For full details follow this tutorial: HTML Doctype