delhi student's day
TRANSCRIPT
C # Corner : Delhi Student’s Day
Don’t be afraid, Let's Code
HTML 5
Be Crazy Not lazy
AGENDA
• HTML5: Past, Present & Future• What is HTML5• What's New in HTML5
• Simplified and Loose Syntax• New Elements and Attributes• Embedded Media• Canvas• Offline Storage• Drag and Drop• Geo-Location …Etc
• Don’t be afraid, Let's Code• (Lets Design a Drawing tool using
HTML5...)• Thanks ! Enjoy Programming
HTML5: PAST, PRESENT & FUTURE
• December 1997: HTML 4.0 is published by the W3C
• February - March 1998: XML 1.0 is published
• December 1999 - January 2000: ECMAScript 3rd Edition, XHTML 1.0 (Basically HTML tags reformulated in XML) and, HTML 4.01 recommendations are published
• May 2001: XHTML 1.1 recommendation is published
• August 2002: XHTML 2.0 first working draft is released.
• December 2002: XHTML 2.0 second working draft published.
• January 2008: First W3C working draft of HTML5 is published!!
• 84% of Developers Plan to Adopt Key HTML5 Features
• The key to understanding HTML5 is that it is not one, but a group of technologies. Within HTML5, developers have a tremendous amount of choice regarding what they use and what they don’t use
• The power of HTML5 being ready for prime-time can be seen in Microsoft’s choice to utilize it in Windows 8
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.
WHAT'S NEW IN HTML5
New Elements in HTML5
<article><aside><audio><canvas><datalist><figure>
<figcaption><footer><header><hgroup><mark><nav>
<progress><section><source><svg><time><video>
These are just some of the new elements introduced in HTML5. I will be exploring each of these during my sessions…
OTHER FEATURES
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" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
In HTML5, there is just one possible DOCTYPE declaration and it is simpler:
<!DOCTYPE html>
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 <HTML> ELEMENT
This is what the <html> element looked like in XHTML:
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
Again, HTML5 simplifies this line:
<html lang="en">
Each of the world’s major languages has a two-character code, e.g. Spanish = "es", French = "fr", German = "de", Chinese = "zh", Arabic = "ar".
The lang attribute in the <html> 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 <HEAD> SECTION
Here is a typical XHTML <head> section:
<head> <meta http-equiv="Content-type" content="text/html; charset=UTF-8" /> <title>My First XHTML Page</title> <link rel="stylesheet" type="text/css" href="style.css" /></head>
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.
<head> <meta charset="utf-8"> <title>My First HTML5 Page</title> <link rel="stylesheet" href="style.css"></head>
BASIC HTML5 WEB PAGE
Putting the prior sections together, and now adding the <body> section and closing tags, we have our first complete web page in HTML5:
<!DOCTYPE html><html lang="en"><head> <meta charset="utf-8"> <title>My First HTML5 Page</title> <link rel="stylesheet" href="style.css"></head><body> <p>HTML5 is fun!</p></body></html>
Let's open this page in a web browser to see how it looks…
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.
Don’t be afraid, Let's Code
CANVAS
With HTML5’s Canvas API, we’re no longer limited to drawing rectangles on our sites. We can draw anything we can imagine, all through JavaScript. This can improvethe performance of our websites by avoiding the need to download images off the network.With canvas, we can draw shapes and lines, arcs and text, gradients and patterns. In addition, canvas gives us the power to manipulate pixels in images and even video.
The Canvas 2D Context spec is supported in:■ Safari 2.0+■ Chrome 3.0+■ Firefox 3.0+■ Internet Explorer 9.0+■ Opera 10.0+■ iOS (Mobile Safari) 1.0+■ Android 1.0+
CREATING A CANVAS ELEMENT
….6.2. Drawing a canvas
We obtain our drawing context by calling the getContext method and passing itthe string "2d", since we’ll be drawing in two dimensions:
I WILL EXPLAIN IN BLOG
With Example: Pixel Bender
VALIDATING AN HTML/HTML5 DOCUMENT
Validating a HTML document means checking or verifing its code according to the standards of HTML5 specifications. For validating an HTML5 document we can use an HTML validator. These are programs that check HTML documents for conformance to the standards. Some common online HTML validator programs:
http://validator.w3.org/http://validator.whatwg.org/• Open a browser and URL ( http://validator.w3.org ).
• Select the "Validate by Direct Input" tab and add the HTML code of the FirstHTMLpage.html file in the provided area. (We can also upload the respective HTML file document directly or By URL).
• Click the check button. If the code complies with the HTML5 standards then the validator displays the results accordingly….
• Click the "Check" button ant note that if your document does not meet the standards of HTML5 then the errors occur, like…
• You can remove all the errors by using this platform…
VALIDATION
http://www.c-sharpcorner.com/UploadFile/79037b/validating-an-htmlhtml5-document/
Don’t Think Just Do
