February 2010
Intermediate to advanced
352 pages
11h 4m
English
Content preview from HTML & CSS: The Good PartsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Rendering Modes, Flavors of HTML, and Document Type Declarations
As of this writing, HTML has been steadily evolving for 17 years. Five versions have been developed, and HTML5, the most recent of these, is steadily making its way to popular use though it is not yet complete. The World Wide Web Consortium (W3C) has also published a Recommendation for XHTML, the XML-conformant version of HTML 4.01.
Note
While it is still too early to know what the “good parts” of HTML5 will be, throughout this book we will cover new HTML5 functionality where it might change best practices.
Since version 1.0, HTML has included something called the document type declaration at the very beginning of the document. This identifies the version of HTML used in a document to a user agent, but was generally ignored by web browsers until 2001. For example, the document type declaration for HTML 4.01 Strict would look like the following:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
The most significant impact of the document type declaration is its influence on the way that element footprints are rendered. Different DOCTYPEs lead to different rendering modes. (They also set expectations for HTML validators.)
Note
You’ve probably seen the acronym “DTD,” which expands to “Document Type Definition.” The DTD is the machine-readable definition that the document type declaration is intended to reference. At any rate, the declaration and definition are different matters; the former ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.