HTML5 and the future of web design

“HTML5 (also sometimes referred to as Web Applications 1.0) is a technology developed by the WHATWG, an open community started by three of the four major browser vendors: Mozilla, Opera, and Apple. HTML5 is not so much a replacement for HTML 4.01 or XHTML 1.0 as it is an upgrade or evolution. It aims for backwards compatibility, tries to remove undefined behavior in HTML 4.01 by defining it, and looks at the various browsers’ tag-soup parsing behavior to try to define the best solution that doesn’t break the web. At the same time, it adds sorely needed semantic elements for things such as improved form validation, interactive elements, and persistent storage.

HTML on the Web Today

While HTML 4.01 is formally an SGML-based document format, the only clients actually treating HTML that way are validators. Browsers, on the other hand, treat HTML documents as tag soup—they try to make sense out of, and display, even the most horridly broken document to their best ability. Very little content on the web is valid HTML 4.01; most of it is invalid and ill-formed, but browsers still have to parse it, or they will soon be disregarded as users switch to browsers that support their favorite sites.

Tag-soup handling—trying to correct errors in documents—is essential, but every browser does it a little differently. All browsers try to get as close as possible to how their largest competitors do it, but even when broken content works the same in different browsers, it doesn’t necessarily mean that they are performing error correction in the same way, just the way that both works for the common case and is most practical for them. HTML5 tries to put an end to this need for reverse engineering of competing browsers by defining exactly how this error correction is to be done. HTML5 doesn’t just define how valid documents are to be parsed, it also defines how parsing should work if documents are invalid, ill-formed, and broken, so that browser vendors can make their products fully interoperable with each other.”

Read the full article at Digital Web Magazine