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HTML5 Video DOM




HTML5 <video> - Take Control Using the DOM

The HTML5 <video> element also has methods, properties, and events.
There are methods for playing, pausing, and loading, for example. There are properties (e.g. duration, volume, seeking) that you can read or set. There are also DOM events that can notify you, for example, when the <video> element begins to play, is paused, is ended, etc.

The examples below illustrate, in a simple way, how to address a <video> element, read and set properties, and call methods.

Example:


<!DOCTYPE html> 
<html> 
<body> 


<div style="text-align:center"> 
  <button onclick="playPause()">Play/Pause</button> 
  <button onclick="makeBig()">Big</button>
  <button onclick="makeSmall()">Small</button>
  <button onclick="makeNormal()">Normal</button>
  <br /> 
  <video id="video1" width="420">
    <source src="mov_bbb.mp4" type="video/mp4" />
    <source src="mov_bbb.ogg" type="video/ogg" />
    Your browser does not support HTML5 video.
  </video>
</div> 


<script type="text/javascript"> 
var myVideo=document.getElementById("video1"); 


function playPause()

if (myVideo.paused) 
  myVideo.play(); 
else 
  myVideo.pause(); 



function makeBig()

myVideo.width=560; 



function makeSmall()

myVideo.width=320; 



function makeNormal()

myVideo.width=420; 

</script> 


<p>Video courtesy of <a href="http://www.bigbuckbunny.org/" target="_blank">Big Buck Bunny</a>.</p>
</body> 
</html>

HTML5 <video> - Methods, Properties, and Events

The table below lists the video methods, properties, and events supported by most browsers:
MethodsPropertiesEvents
play()currentSrcplay
pause()currentTimepause
load()videoWidthprogress
canPlayTypevideoHeighterror
durationtimeupdate
endedended
errorabort
pausedempty
mutedemptied
seekingwaiting
volumeloadedmetadata
height
width
Note: Of the video properties, only videoWidth and videoHeight are immediately available. The other properties are available after the video's meta data has loaded.

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HTML5 VIDEO



Many modern websites show videos. HTML5 provides a standard for showing them.

Video on the Web

Until now, there has not been a standard for showing a video/movie on a web page.
Today, most videos are shown through a plug-in (like flash). However, different browsers may have different plug-ins.
HTML5 defines a new element which specifies a standard way to embed a video/movie on a web page: the <video> element.

Browser Support


Internet Explorer 9, Firefox, Opera, Chrome, and Safari support the <video> element.
Note: Internet Explorer 8 and earlier versions, do not support the <video> element.

HTML5 Video - How It Works

To show a video in HTML5, this is all you need:
Example:


<video width="320" height="240" controls="controls">
  <source src="movie.mp4" type="video/mp4" />
  <source src="movie.ogg" type="video/ogg" />
  Your browser does not support the video tag.
</video>




The control attribute adds video controls, like play, pause, and volume.
It is also a good idea to always include width and height attributes. If height and width are set, the space required for the video is reserved when the page is loaded. However, without these attributes, the browser does not know the size of the video, and cannot reserve the appropriate space to it. The effect will be that the page layout will change during loading (while the video loads).
You should also insert text content between the <video> and </video> tags for browsers that do not support the <video> element.
The <video> element allows multiple <source> elements. <source> elements can link to different video files. The browser will use the first recognized format.

Video Formats and Browser Support

Currently, there are 3 supported video formats for the <video> element: MP4, WebM, and Ogg:
BrowserMP4WebMOgg
Internet Explorer 9YESNONO
Firefox 4.0NOYESYES
Google Chrome 6YESYESYES
Apple Safari 5YESNONO
Opera 10.6NOYESYES
  • MP4 = MPEG 4 files with H264 video codec and AAC audio codec
  • WebM = WebM files with VP8 video codec and Vorbis audio codec
  • Ogg = Ogg files with Theora video codec and Vorbis audio codec




HTML5 Video Tags

TagDescription
<video>Defines a video or movie
<source>Defines multiple media resources for media elements, such as <video> and <audio>
<track>Defines text tracks in mediaplayers
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HTML5 - New Elements



New Elements in HTML5

The internet has changed a lot since HTML 4.01 became a standard in 1999.
Today, some elements in HTML 4.01 are obsolete, never used, or not used the way they were intended to. These elements are removed or re-written in HTML5.
To better handle today's internet use, HTML5 includes new elements for better structure, better form handling, drawing, and for media content.

New Semantic/Structural Elements

HTML5 offers new elements for better structure:
TagDescription
<article>Defines an article
<aside>Defines content aside from the page content
<bdi>Isolates a part of text that might be formatted in a different direction from other text outside it
<command>Defines a command button that a user can invoke
<details>Defines additional details that the user can view or hide
<summary>Defines a visible heading for a <details> element
<figure>Specifies self-contained content, like illustrations, diagrams, photos, code listings, etc.
<figcaption>Defines a caption for a <figure> element
<footer>Defines a footer for a document or section
<header>Defines a header for a document or section
<hgroup>Groups a set of <h1> to <h6> elements when a heading has multiple levels
<mark>Defines marked/highlighted text
<meter>Defines a scalar measurement within a known range (a gauge)
<nav>Defines navigation links
<progress>Represents the progress of a task
<ruby>Defines a ruby annotation (for East Asian typography)
<rt>Defines an explanation/pronunciation of characters (for East Asian typography)
<rp>Defines what to show in browsers that do not support ruby annotations
<section>Defines a section in a document
<time>Defines a date/time
<wbr>Defines a possible line-break

New Media Elements

HTML5 offers new elements for media content:
TagDescription
<audio>Defines sound content
<video>Defines a video or movie
<source>Defines multiple media resources for <video> and <audio>
<embed>Defines a container for an external application or interactive content (a plug-in)
<track>Defines text tracks for <video> and <audio>

The new <canvas> Element </canvas>

TagDescription
<canvas>Used to draw graphics, on the fly, via scripting (usually JavaScript)

New Form Elements


HTML5 offers new form elements, for more functionality:
TagDescription
<datalist>Specifies a list of pre-defined options for input controls
<keygen>Defines a key-pair generator field (for forms)
<output>Defines the result of a calculation



Removed Elements

The following HTML 4.01 elements are removed from HTML5:
  • <acronym>
  • <applet>
  • <basefont>
  • <big>
  • <center>
  • <dir>
  • <font>
  • <frame>
  • <frameset>
  • <noframes>
  • <strike>
  • <tt>
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HTML5 is The New HTML Standard



HTML5

  • New Elements
  • New Attributes
  • Full CSS3 Support
  • Video and Audio
  • 2D/3D Graphics
  • Local Storage
  • Local SQL Database
  • Web Applications
HTML5 Example:
<video controls="controls" height="240" width="320">
<source src="movie.mp4" type="video/mp4"></source>
<source src="movie.ogg" type="video/ogg"></source>
<source src="movie.webm" type="video/webm"></source>
Your browser does not support the video tag.
</video>

HTML5 Introduction

What is HTML5?

HTML5 will be the new standard for HTML.

The previous version of HTML, HTML 4.01, came in 1999. The web has changed a lot since then.

HTML5 is still a work in progress. However, the major browsers support many of the new HTML5 elements and APIs.

How Did HTML5 Get Started?

HTML5 is a cooperation between the World Wide Web Consortium (W3C) and the Web Hypertext Application Technology Working Group (WHATWG).

WHATWG was working with web forms and applications, and W3C was working with XHTML 2.0. In 2006, they decided to cooperate and create a new version of HTML.

Some rules for HTML5 were established:

New features should be based on HTML, CSS, DOM, and JavaScript
Reduce the need for external plugins (like Flash)
Better error handling
More markup to replace scripting
HTML5 should be device independent
The development process should be visible to the public

The HTML5 <!doctype>

In HTML5 there is only one declaration, and it is very simple:


<!DOCTYPE html>

Minimum HTML5 Document

Below is a simple HTML5 document, with the minimum of required tags:

Minimum HTML5 Document
Below is a simple HTML5 document, with the minimum of required tags:

<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
The content of the document......
</body>
</html>

HTML5 - New Features

Some of the most interesting new features in HTML5:
  • The <canvas> element for 2D drawing
  • The <video> and <audio> elements for media playback
  • Support for local storage
  • New content-specific elements, like <article>, <footer>, <header>, <nav>, <section>
  • New form controls, like calendar, date, time, email, url, search



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HTML Tutorial Part-5: HTML Paragraph and HTML Text Formatting



Paragraphs are defined with the <p> tag.
Example:
<p>This is a paragraph</p>
<p>This is another paragraph</p>
Note: Browsers automatically add an empty line before and after a paragraph.

Don't Forget the End Tag
Most browsers will display HTML correctly even if you forget the end tag:
Example:
<p>This is a paragraph
<p>This is another paragraph
The example above will work in most browsers, but don't rely on it. Forgetting the end tag can produce unexpected results or errors.
Note: Future version of HTML will not allow you to skip end tags.

HTML Line Breaks:

Use the <br /> tag if you want a line break (a new line) without starting a new paragraph:
Example
<p>This is<br />a para<br />graph with line breaks</p>

he <br /> element is an empty HTML element. It has no end tag.
<br> or <br />

In XHTML, XML, elements with no end tag (closing tag) are not allowed.

Even if <br> works in all browsers, writing <br /> instead works better in XHTML and XML applications.

HTML Output - Useful Tips
You cannot be sure how HTML will be displayed. Large or small screens, and resized windows will create different results.

With HTML, you cannot change the output by adding extra spaces or extra lines in your HTML code.

The browser will remove extra spaces and extra lines when the page is displayed. Any number of lines count as one line, and any number of spaces count as one space.

HTML Text Formatting:

This text is bold

This text is big

This text is italic

This is computer output

This is subscript and superscript

HTML Formatting Tags:

HTML uses tags like <b> and <i> for formatting output, like bold or italic text.

These HTML tags are called formatting tags (look at the bottom of this page for a complete reference).
Remark     Often <strong> renders as <b>, and <em> renders as <i>.

However, there is a difference in the meaning of these tags:

<b> or <i> defines bold or italic text only.

<strong> or <em> means that you want the text to be rendered in a way that the user understands as "important". Today, all major browsers render strong as bold and em as italics. However, if a browser one day wants to make a text highlighted with the strong feature, it might be cursive for example and not bold!

HTML Text Formatting Tags

Tag Description
<b> Defines bold text
<big> Defines big text
<em> Defines emphasized text 
<i> Defines italic text
<small> Defines small text
<strong> Defines strong text
<sub> Defines subscripted text
<sup> Defines superscripted text
<ins> Defines inserted text
<del> Defines deleted text

HTML "Computer Output" Tags

Tag Description
<code> Defines computer code text
<kbd> Defines keyboard text 
<samp> Defines sample computer code
<tt> Defines teletype text
<var> Defines a variable
<pre> Defines preformatted text

HTML Citations, Quotations, and Definition Tags

Tag Description
<abbr> Defines an abbreviation
<acronym> Defines an acronym
<address> Defines contact information for the author/owner of a document
<bdo> Defines the text direction
<blockquote> Defines a long quotation
<q> Defines a short quotation
<cite> Defines a citation
<dfn> Defines a definition term

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