HTML5 is much smarter, so its need simple syntax to specify it, Few of them are below:
Quotes are optional for attributes.
Uppercase tag names.
Closing empty elements are optional.
Attribute values are optional.
DOCTYPE -
In the older version of HTML, we need to write a long like to declare DOCTYPE because HTML is SGML(Standard Generalized Markup Language) based so its need a DTD (document type definition).
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