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Doctype declaration.html

<!-- All HTML documents must start with a <!DOCTYPE> declaration. The declaration is not an HTML tag. It is an "information" to the browser about what document type to expect. --> ...
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Introduction to HTML ~About"!doctype html"~

<!doctype html> is a declaration for HTML documents on web pages, informing the web browser that this document is written in HTML5. This is positioned at the very first line of a web page, providing a ...
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DOCTYPE Declaration.txt

DOCTYPE Declaration:--The DOCTYPE declaration is an instruction that specifies the version of HTML (or XML) that a web page is written in. It stands for "Document Type Declaration." The purpose of the ...