Introduction to HTML5. History of HTML HTML first published 1991 2012 2002 - 2009 2000 HTML 2.0 HTML 3.2 HTML 4.01 XHTML 1.0 XHTML 2.0 HTML5 1995 1997.

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Presentation transcript:

Introduction to HTML5

History of HTML HTML first published HTML 2.0 HTML 3.2 HTML 4.01 XHTML 1.0 XHTML 2.0 HTML HTML5 is much more tolerant and can handle markup from all the prior versions. Though HTML5 was published officially in 2012, it has been in development since After HTML 4.01 was released, focus shifted to XHTML and its stricter standards. XHTML 2.0 had even stricter standards than 1.0, rejecting web pages that did not comply. It fell out of favor gradually and was abandoned completely in 2009.

What is HTML5? HTML5 is the newest version of HTML, only recently gaining partial support by the makers of web browsers. It incorporates all features from earlier versions of HTML, including the stricter XHTML. It adds a diverse set of new tools for the web developer to use. It is still a work in progress. No browsers have full HTML5 support. It will be many years – perhaps not until 2018 or later - before being fully defined and supported.

Goals of HTML5 Support all existing web pages. With HTML5, there is no requirement to go back and revise older websites. Reduce the need for external plugins and scripts to show website content. Improve the semantic definition (i.e. meaning and purpose) of page elements. Make the rendering of web content universal and independent of the device being used. Handle web documents errors in a better and more consistent fashion.

New Elements in HTML5 These are just some of the new elements introduced in HTML5. We will be exploring each of these during this course.

Other New Features in HTML5 Built-in audio and video support (without plugins) Enhanced form controls and attributes The Canvas (a way to draw directly on a web page) Drag and Drop functionality Support for CSS3 (the newer and more powerful version of CSS) More advanced features for web developers, such as data storage and offline applications.

First Look at HTML5 Remember the DOCTYPE declaration from XHTML? <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " In HTML5, there is just one possible DOCTYPE declaration and it is simpler: Just 15 characters! The DOCTYPE tells the browser which type and version of document to expect. This should be the last time the DOCTYPE is ever changed. From now on, all future versions of HTML will use this same simplified declaration.

The Element This is what the element looked like in XHTML: Again, HTML5 simplifies this line: Each of the worlds major languages has a two-character code, e.g. Spanish = "es", French = "fr", German = "de", Chinese = "zh", Arabic = "ar". The lang attribute in the element declares which language the page content is in. Though not strictly required, it should always be specified, as it can assist search engines and screen readers.

The Section Here is a typical XHTML section: My First XHTML Page And the HTML5 version: Notice the simplified character set declaration, the shorter CSS stylesheet link text, and the removal of the trailing slashes for these two lines. My First HTML5 Page

Basic HTML5 Web Page Putting the prior sections together, and now adding the section and closing tags, we have our first complete web page in HTML5: My First HTML5 Page HTML5 is fun! Let's open this page in a web browser to see how it looks…

Viewing the HTML5 Web Page Even though we used HTML5, the page looks exactly the same in a web browser as it would in XHTML. Without looking at the source code, web visitors will not know which version of HTML the page was created with.