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Owing that there are several document types, of which HTML is but one, the DTD, or Document Type Declaration is of necessity written in another language. SGML is the language that DTDs are written in.
The role played by SGML in the early days may well have been supplanted by XML in modern times. Either way, it’s another language helping the client to adapt to the current document with which it is interacting. On top of that we have C++ (C# in IE and Edge, Go in Chrome) helping ES manage the behavior of the interface as well as manage the style sheets and other browser features.
All the behind the scenes stuff is of no concern to us on the development side. It’s what we call tools. We didn’t make the hammer or wrench, only use them.
My question is about the element that was mentioned in the introduction to HTML. I learned that other elements are content, not just plain texts, but in The Tag section, it was mentioned that the html tag does not have structure or content; by default, it does not have content. on still we start putting other tags or elements while writing?
Yes, you are correct. In HTML, the <html> tag is a container element that wraps around the entire HTML document. It provides a structure for the document and serves as the root element. While the <html> tag itself does not have visible content in the web page, it establishes the document’s structure and acts as a container for other tags or elements.
<html>
<head>
<title>My HTML Document</title>
</head>
<body>
<!-- Content goes here -->
<h1>Hello, World!</h1>
<p>This is a sample HTML document.</p>
</body>
</html>
In the examples above, the <html> tag itself does not have visible content, but it provides the structure for the document and contains other tags (<head> and <body> ) that, in turn, include additional content and elements.