The purpose of DOCTYPE is to:
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Specify Document Type: It indicates the version of HTML or XHTML that the document is written in, helping browsers understand how to interpret the content.
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Ensure Standards Compliance: By declaring a DOCTYPE, you enable standards mode in browsers, which ensures that the page is rendered according to web standards rather than in quirks mode, which can lead to inconsistent rendering.
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Improve Compatibility: It helps maintain compatibility across different web browsers, ensuring that the webpage displays consistently for users regardless of the browser they are using.
Overall, the DOCTYPE declaration is essential for proper web development and rendering.
