HTML and CSS Reference
In-Depth Information
• How to use the new semantic elements to lay out a page.
• How to deal with older versions of Internet Explorer that don't recognize the new
elements.
• About the new form features you can implement immediately in HTML5.
• How to use new UI elements, such as progress bars and collapsible sections.
Let's get started by examining the basic structure of an HTML5 document. If you're not in-
terested in the basics, you can read quickly until you reach section 1.2 , which goes beyond
semantic markup and into the HTML5 ecosystem.
1.1.1. Creating the basic structure of an HTML5 document
HTML5 documents are structured in the same way as older versions of HTML: you put
a <!DOCTYPE> declaration at the top of the document and open and close the HTML
document with matching <html> and </html> tags. Between these tags, you have a
<head> section, where you place <meta> information and other noncontent items such
as stylesheets, and a <body> section, where your page content should go. If you've writ-
ten HTML pages or applications before, none of this will be new to you, but you need to
be aware of some subtle differences, which we'll cover in this section:
• The HTML5 DOCTYPE declaration syntax.
• How to use the opening <html> element.
• How to use the shorter versions of the various elements in the <head> section.
Let's look more closely at these differences by examining hello.html, the HTML5 equival-
ent of a “Hello, World!” application, shown in the following listing.
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