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CSS is used in DHTML to control the look and feel of the Web page. Style sheets define the colors and fonts of text, the background colors and images, and the placement of objects on the page. Using scripting and the DOM, you can change the style of various elements.

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Scripts written in either JavaScript or ActiveX are the two most common scripting languages used to activate DHTML. You use a scripting language to control the objects specified in the DOM.

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The Dynamic part allows the users to interact with the site this is different to the static option where there is no interaction.

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The DOM is what allows you to access any part of your Web page to change it with DHTML. Every part of a Web page is specified by the DOM and using its consistent naming conventions you can access them and change their properties

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XHTML or HTML 4.x is used to create the page itself and build the elements for the CSS and the DOM to work on.

There is nothing special about XHTML for DHTML - but having valid XHTML is even more important, as there are more things working from it than just the browser

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What is it?
Real Player is a cross-platform media player app, developed by RealNetworks. It is compatible with: MP3, MP4, QuickTime File Format, Windows Media Format, RealAudio and RealVideos. It is available on other operating systems other than Windows like; Linux, Unix, Palm OS, Windows Mobile, Android and Symbian.

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Give examples of some functions.
RealPlayer has a built in, dedicated Converter application. It also acts as a media web browser as you can watch videos on popular social media platforms like Facebook, Twitter and YouTube. As well as this, you can post on these websites any videos saved or edited on the RealPlayer.

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When was Real Player first released?
Real Player was released by RealNetworks 22 years ago in April of 1995.

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What controversy has surrounded RealPlayer?
Earlier versions of RealPlayer was criticized for containing adware and spyware. In 1999 security researcher Richard M. Smith dissected some of RealJukebox's network traffic and discovered that it was sending a unique identifier with information about the music titles to which its users were listening. The story blew up so much so that PC World magazine named the 1999 version of RealPlayer the second worst tech products of All Time. RealNetworks issued a patch, and the spyware was removed in version 1.02.

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What is Silverlight?
Microsoft Silverlight is a deprecated application framework for writing and running rich internet applications, similar to Adobe Flash.
Microsoft announced the end of life of Silverlight 5 in 2012. In 2013, Microsoft announced that they had ceased development of Silverlight except for patches and bugfixes. Microsoft has set the support end date for Silverlight 5 to be October 2021. Silverlight is no longer supported on web browsers such as Google Chrome since September 2015 and in Firefox in early 2017 and it was never in Microsoft Edge.

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Who made QuickTime:
Quick Time is a audio and digital player developed by Apple the lead developer of QuickTime was Bruce Leak. and ran the first public demonstration in May 1991

What is it?
Quick Time is a multimedia software that is used for handling video, Sound, Animation, Graphics, text, interactivity.

What OS does it work on?
This software works with both apple products and also windows 7 and onward.

Is it Free:
The full version of the product is not free but there is a free version that does not have all of the features.

What does it Provide?
The QuickTime software provides,:

- encoding and transcoding vidio and audio from one format to another
- decoding vidio and audo, then sending th decoded stream to the grapphics or audo subsystem for play back in MAC OS x .
- A plug-in architecture for swuppoting additional codecs

What file formats does it support?

_ AIFF, WAV, DV, MP3, MPED-1

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FutureSplash was originally developed by Jonathan Gay, which was then acquiered by Macromedia in 1996 and released as Flash.

Shockwave was first developed by Harry Chesley, John Newlin, Sarah Allen and Ken Day in 1995 and was released in 1995.

In 2005 Macromedia was acquired by Adobe.

File Extensions
Flash = .fla
Shockwave = .swf

Main Differences

- Flash files load more quickly than Shockwave files

- Shockwave is more versatile allowing the creation of more complex games, detailed animation and interactivity.

Uses
Both can be used to create games, interactive content, animations, display videos and play audio.

Advantages of Flash
- Can make a website more interactive
- Industry standard for low-end animation, therefore lots of tutorials available
- User can easily create animations with ActionScript
- Open source format

Disadvantages of Flash
- Does not work on mobile devices
- Security vulnerabilities
- Viewing flash requires flash player to be installed - some users may not want / be able to install this.