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Flash: Industry-leading rich web-content rendering platformFlash started out as a proprietary animation solution by Macromedia, inc. as a software studio which enabled animators and developers alike to collaborate on rich, interactive media objects which could in turn be embedded in a web page and displayed within a standard web browser.

The Flash technology has almost always since its inception enjoyed a strong niche following on the web, with a loyal developer, contributor and user base, however it was Adobe's 2005 acquisition of Macromedia [1] which infused the Flash technology with new life, as it re-emerged as an entire rich media platform of its own, still designed for delivery over the web and standard browsers, but with many more capabilities and a larger scope. Entire applications could now be created using the Flash and Adobe ColdFusion combination, as could multimedia presentations including local video playback and remote video streaming using Flash's VP6 (.flv) video codec, or MP4 which was supported shortly after.


Cross-Domain Policy File

In 2003, Flash Player 7 software introduced a channel of client-server communication that was new to the web: direct cross-domain data loading, authorized by policy files. This was accomplished via files of the name "crossdomain.xml" loading in the root of a given domain (i.e. Adobe.com/crossdomain.xml), stored in the XML format, this became a "de facto" standard for cross-domain requests (see same-origin section of AJAX). Before their existence, it was very tough if not impossible for web applications to communicate across servers without an intermediary server-side script, however now by using a crossdomain.xml file it is possible to make Flash direct requests or Flash-backed AJAX requests across domains and ports (origins).[3] [4]

<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy SYSTEM "http://www.adobe.com/xml/dtds/cross-domain-policy.dtd">
  <site-control permitted-cross-domain-policies="master-only"/>
  <allow-access-from domain="swf.example.com" to-ports="123,456-458" />

Local Shared Objects

A Local Shared Object (commonly abbreviated as LSO) is the Flash-equivalent of a cookie. An LSO on a given domain is accessible only within the Flash application or object that created it.




External Links


  1. Adobe Acquires Macromedia: http://www.adobe.com/aboutadobe/pressroom/pressreleases/200504/041805AdobeAcquiresMacromedia.html
  2. http://www.adobe.com/content/dam/Adobe/en/devnet/swf/pdf/swf_file_format_spec_v10.pdf
  3. Policy file changes in Flash Player 9 and Flash Player 10: http://www.adobe.com/devnet/flashplayer/articles/fplayer9_security.html
  4. Policy file changes in Flash Player 9 and Flash Player 10 (WORKFLOWS -- i.e. what to do to ensure forward-compatibility): http://www.adobe.com/devnet/flashplayer/articles/fplayer9_security_05.html
  5. Welcome Adobe Animate CC, a new era for Flash Professional: https://blogs.adobe.com/creativecloud/welcome-adobe-animate-cc-a-new-era-for-flash-professional/
  6. Flash Studio Professional: https://adobe.com/mt/products/flash.html
  7. Animation with Scripting for Adobe Flash Professional CS5 Studio Techniques (BOOK): https://www.amazon.com/Animation-Scripting-Professional-Studio-Techniques/dp/0321683692
  8. Video with Adobe Flash CS4 Professional Studio Techniques: https://www.kobo.com/us/en/ebook/video-with-adobe-flash-cs4-professional-studio-techniques-1
  9. Flash MX Studio (BOOK): http://www.apress.com/us/book/9781590591888
  10. Convert Flash Ads to HTML5: http://helpx.adobe.com/animate/how-to/convert-flash-ads-to-html5.html
  11. Adobe demos Flash-to-HTML5 conversion tool: http://blogs.adobe.com/jnack/2010/10/adobe-demos-flash-to-html5-conversion-tool.html
  12. Adobe Converts Flash to HTML5 With Wallaby: http://www.htmlgoodies.com/beyond/webmaster/toolbox/adobe-converts-flash-to-html5-with-wallaby.html
  13. “Wallaby” Flash-to-HTML5 conversion tool now available: https://blogs.adobe.com/jnack/2011/03/wallaby-flash-to-html5-conversion-tool-now-available.html
  14. Google display ads go 100% HTML5: https://plus.google.com/+GoogleAds/posts/dYSJRrrgNjk
  15. Update your Flash ads: https://support.google.com/adwords/answer/6249073
  16. Swiffy -- convert SWF files to HTML5: http://googlecode.blogspot.ca/2011/06/swiffy-convert-swf-files-to-html5.html
  17. OGG in Flash? Yes you can. Now how about WMA?: http://bcdef.org/2009/05/13/ogg-in-flash-yes-you-can-now-how-about-wma/
  18. wikipedia: Tamarin (JavaScript engine)
  19. Adobe Flash just took another step towards death, thanks to Google: https://thenextweb.com/apps/2015/09/01/adobe-flash-just-took-another-step-towards-death-thanks-to-google/#.tnw_I94YgjKt
  20. Flash Embedding Cage Match: https://alistapart.com/article/flashembedcagematch
  21. Flash Satay & communication with Flash: https://forums.adobe.com/thread/211024
  22. Satay Method -- Embedding Flash in xHTML Site: https://www.webmasterworld.com/forum104/790.htm
  23. Creating a Flash motion tween: http://www.websiteoptimization.com/secrets/web-page/6-9-flash-motion-tween.html
  24. Flash wmode="transparent" not working in IE: http://forums.adobe.com/message/4097264
  25. You Deleted Your Cookies? Think Again: http://www.wired.com/epicenter/2009/08/you-deleted-your-cookies-think-again
  26. Create and publish HTML5 Canvas documents in Animate CC: https://helpx.adobe.com/animate/using/creating-publishing-html5-canvas-document.html
  27. ActionScript® 3.0 Reference docs for the Adobe® Flash® Platform - ColorExample.as: http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/fl/motion/Color.html

See Also

Adobe | ActionScript | Flex | HTML5 | Silverlight | JavaFX