What is DOCUMENT TYPE DEFINITION (DTD)

Document type definition also called DTD. DTD documents coded in a particular language called HTML (Hyper Text Markup Language). In HTML code DTD define as <!DOCTYPE>.
The definition of DTD (Document Type Definition) is “a particular document or set of statements that follow the rules and regulations of the SGML (Standard Generalized Markup Language) or XML (Extensible Markup Language).
The function of a DTD (Document Type Definition) is to describe the document structure, list of authorized elements and attributes and authorized structure widget.

Example

<!DOCTYPE html>
<html>
<head>
<title>Web Data</title>
</head>
<body>
Unique content of the document......
</body>
</html>

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