HTML and CSS Reference
In-Depth Information
O
NLINE
http://htmlref.com/ch2/helloworld.html
For all practical purposes, all that is different from standard HTML in this example is
the
<!DOCTYPE>
statement. Given such minimal changes, of course, basic HTML5 will
immediately render correctly in browsers, as demonstrated in Figure 2-1.
As indicated by its atypical
<!DOCTYPE>
statement, HTML5 is not defined as an SGML
or XML application. Because of the non-SGML/XML basis for HTML, there is no concept of
validation in HTML5; instead, an HTML5 document is checked for conformance to the
specification, which provides the same practical value as validation. So the lack of a formal
DTD is somewhat moot. As an example, consider the following flawed markup:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>
Hello Malformed HTML5 World
</title>
</head>
<body>
<!-- note bad close tag below -->
<h1>
Hello Malformed HTML5
<h1>
<!-- unknown tag found here -->
<p>
Welcome to the
<danger>
future
</danger>
of markup!
</p>
<!-- missing </body> -->
</html>
F
IGURE
2-1 HTML5 is alive.
