Peter Lubbers - Pro HTML 5 Programming

Figure 1-1. A page rendered in standards-compliant mode
CHAPTER 1 ■ OVERVIEW OF HTML5
When you use the new HTML5 DOCTYPE, it triggers browsers to render the page in standardscompliant
mode. As you may know, Web pages can have different rendering modes, such as Quirks,
Almost Standards, and Standards (or no-quirks) mode. The DOCTYPE indicates to the browser which
mode to use and what rules are used to validate your pages. In Quirks mode, browsers try to avoid
breaking pages and render them even if they are not entirely valid. HTML5 introduces new elements and
others (more on this in the next section) so that if you use deprecated elements, your page will not be
valid.
New and Deprecated Elements
HTML5 introduces many new markup elements, which it groups into seven different content types.
These are shown below in Table 1-1.
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