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HTML 5

HTML 5. New Tags, New Attributes, New JavaScript APIs, Forms, Validation, Audio, Video, SVG, Canvas. Doncho Minkov. Telerik Corporation. www.telerik.com. Table of Contents. Introduction to HTML 5 Changed Old Tags New Tags Audio and Video Tags

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HTML 5

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  1. HTML 5 New Tags, New Attributes, New JavaScript APIs, Forms, Validation, Audio, Video, SVG, Canvas Doncho Minkov Telerik Corporation www.telerik.com

  2. Table of Contents • Introduction to HTML 5 • Changed Old Tags • New Tags • Audio and Video Tags • New Structural Tags (<header>, <footer>, …) • New Form Elements and Validation • New Attributes • Canvas vs. SVG • Local Storage

  3. Introduction to HTML 5 What the … is HTML 5?

  4. What is HTML 5? • HTML5 – the next major revision of the HTML • Currently under development • Far away from final version • Developed under the HTML 5 working group of the World Wide Web Consortium (W3C) in 2007 • First Public Working Draft of the specification • January 22, 2008 • Parts of HTML5 are being implemented in browsers before the whole specification is ready

  5. HTML – Past, Present, Future • 1991 – HTML first mentioned – Tim Berners-Lee – HTML tags • 1993 – HTML (first public version, published at IETF) • 1993 – HTML 2 draft • 1995 – HTML 2 – W3C • 1995 – HTML 3 draft • 1997 – HTML 3.2 – “Wilbur” • 1997 – HTML 4 – ”Cougar” – CSS • 1999 – HTML 4.01 (final) • 2000 – XHTML draft • 2001 – XHTML (final) • 2008 – HTML5 / XHTML5 draft • 2011 – feature complete HTML5 • 2022 – HTML5 – final specification

  6. HTML 5 Goals • Latest version is HTML5 • Aimed to have all of the power of native applications • Run on any platform (Windows, Linux, iPhone, Android, etc.) • New features should be based on HTML, CSS, DOM and JavaScript • Reduce the need for external plugins • Better error handling • More markup to replace scripting

  7. Designer Outlook What a Designer Should Know?

  8. Changed Old Tags • Doctype tag: • HTML tag: • Meta tag: • Link tag: <!DOCTYPE html> <html lang="en" xml:lang="en"> <meta charset="utf-8"> <link rel="stylesheet" href="style-original.css">

  9. New Layout Sctucture • Better layout structure: new structural elements • <section> • <header> • <nav> • <article> • <aside> • <footer> <header> <nav> <section> <aside> <header> <article> <footer> <footer>

  10. New Layout Sctucture (2) • Elements like header and footer are not meant to be only at the top and bottom of the page • Header and footer of each document section • Not very different from <DIV> tag but are more semantically well defined in the document structure

  11. New Layout Sctucture – Example <body> <header> <hgroup> <h1>HTML 5 Presentation</h1> <h2>New Layout Structure</h2>     </hgroup> </header> <nav>     <ul> Lecture     </ul> <ul> Demos     </ul> <ul> Trainers     </ul> </nav>

  12. New Layout Sctucture – Example (2) <section> <article> <header>         <h1>First Paragraph</h1>       </header> <section> Some text </section> </article> </section> <aside> <a href="http://academy.telerik.com"> more info</a> </aside> <footer> Done by Doncho Minkov, (c) 2011, Telerik Academy </footer> </body>

  13. New Layout Structure Tags Live Demo

  14. New Tags • <article> • For external content, like text from a news-article, blog, forum, or any other external source • <aside> • For content aside from (but related to) the content it is placed in • <details> • For describing details about a document, or parts of a document • <summary> • A caption, or summary, inside the details element

  15. New Tags (2) • <mark> • For text that should be highlighted • <nav> • For a section of navigation • <section> • For a section in a document (e.g. chapters, headers, footers) • <wbr> • Word break. For defining an appropriate place to break a long word or sentence • Other tags • <command>,<datalist>, <details>,<progress>, etc.

  16. New Media Tags • Media Tags • <audio> • Attributes: autoplay, controls, loop, src • <video> • Attributes: autoplay, controls, loop, height, width, src <audio width="360" height="240" controls= "controls" > <source src="someSong.mp3" type="audio/mp3"> </source> Audio tag is not supported </audio>

  17. Playing Audio Live Demo

  18. Embed Tag – New Syntax • <embed> • Defines embedded content, such as a plug-in • Attributes • src="url", type="type" <embed src="helloworld.swf" />

  19. New Attributes • New attributes

  20. New <input> Types • New <input>type(s)

  21. New Form Tags:<input type="range"> Live Demo

  22. Built-In Forms Validation Live Demo

  23. Canvas vs. SVG

  24. Canvas • Allows dynamic, scriptable rendering of 2D shapes and bitmap images • Low level, procedural model • Updates a bitmap • Does not have a built-in scene graph • Consists of a drawable region defined in HTML • Has height and width attributes • Accessible by JavaScript Code • Used for building graphs, animations, games, and image composition

  25. Canvas Example • In HTML: <canvas id="example" width="200" height="200"> This is displayed if HTML5 Canvas is not supported. </canvas> • Access with JavaScript: var example = document.getElementById('example'); var context = example.getContext('2d'); context.fillStyle = "rgb(255,0,0)"; context.fillRect(30, 30, 50, 50);

  26. Canvas Example • In HTML: <canvas id="example" width="200" height="200"> This is displayed if HTML5 Canvas is not supported. </canvas> • Access with JavaScript: var example = document.getElementById('example'); var context = example.getContext('2d'); context.fillStyle = "rgb(255,0,0)"; context.fillRect(30, 30, 50, 50);

  27. SVG • SVG stands for Scalable Vector Graphics • A language for describing 2D-graphics • Graphical applications • Most of the web browsers can display SVG just like they can display PNG, GIF, and JPG • Internet Explorer users may have to install the Adobe SVG Viewer • HTML5 allows embedding SVG • Directly using <svg>...</svg> • https://developer.mozilla.org/en/SVG

  28. SVG Example <!DOCTYPE html> <head> <title>SVG</title> <meta charset="utf-8" /> </head> <body> <h2>HTML5 SVG Circle</h2> <svg id="svgelem" height="200" xmlns="http://www.w3.org/2000/svg"> <circle id="redcircle" cx="50" cy="50" r="50" fill="red" /> </svg> </body> </html>

  29. SVG Gradient Example <svg id="svgelem" height="200" xmlns="http://www.w3.org/2000/svg"> <defs> <radialGradient id="gradient" cx="50%" cy="50%" r="50%" fx="50%" fy="50%"> <stop offset="0%" style="stop-color:rgb(200,200,200);stop-opacity:0"/> <stop offset="100%" style="stop-color:rgb(0,0,255);stop-opacity:1"/> </radialGradient> </defs> <ellipse cx="100" cy="50" rx="100" ry="50" style="fill:url(#gradient)" /> </svg>

  30. Canvas vs. SVG Live Demo

  31. Local Storage • More persistent than temporary internet files and cookies • Most useful for (mobile) devices that are not connected to the Internet all the time, or when bandwidth is scarce • More storage space available - 5MB limit per domain (recommended by W3C), compared to 4KB per cookie

  32. Local Storage Demo HTML <form> <fieldset> <label for="value">enter key name:</label> <input type="text" id="key" /> <label for="value">enter key value:</label> <input type="text" id="value" /> </fieldset> <fieldset> <button type="button" onclick="setValue()"> store the key value</button> <button type="button" onclick="getValue()"> retrieve the key value</button> <button type="button" onclick="getCount()"> retrieve the number of keys</button> <button type="button" onclick="clearAll()"> clear all key values</button> </fieldset> </form>

  33. Local Storage Demo Script var$ = function (id) { return document.getElementById(id); } function setValue() { window.localStorage.setItem($("key").value, $("value").value); } function getValue() { alert(window.localStorage.getItem($("key").value)); } function getCount() {alert(window.localStorage.length);} function clearAll() {window.localStorage.clear();}

  34. End User Outlook What is the Advantage to the End User?

  35. HTML 5 – End User Outlook • Provides a very rich user experience without Plug-ins • RIA replacement? • Better Performance • Leverages GPU for bettergraphical experience

  36. How to Detect HTML5? • HTML5 is not a thing someone can detect • It consists of many elements that can be detected • <canvas>, <video>, etc. • The HTML5 specification defines how tags interact with JavaScript • Through the Document Object Model (DOM) • HTML5 doesn’t just define a <video>tag • There is also a corresponding DOM API for video objects in the DOM • You can use this API to detect support for different video formats, etc.

  37. HTML 5 – Showcases and Resources • HTML 5 Rocks – Examples, Demos, Tutorials • http://www.html5rocks.com/ • HTML 5 Demos • http://html5demos.com/ • Internet Explorer 9 Test Drive for HTML 5 • http://ie.microsoft.com/testdrive/ • Apple Safari HTML 5 Showcases • http://www.apple.com/html5/ • Dive into HTML 5 • http://diveintohtml5.org/

  38. HTML 5 ? ? Questions? ? ? ? ? ? ? ? ? ?

  39. Homework • Make the following Web Page. • Note that there should be validators for emails and url (email and url are required fields) • Using the previouslymade Web Page, add functionality to check ifthe text in "email"and "repeat email" fields is equal. If not showwarning message and reload the page

  40. Homework (2) • Using Canvas draw the following figures • Try doing the sameusing SVG • Hint: Use JavaScript

  41. Homework (3) • Build the following Web Page using HTML5 and CSS 2.1 • Use "Lorem Ipsum" to fill with some sample Content • Try to make the pagelook OK whenthe window is resized

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