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GIF

The Graphics Interchange Format is a bitmap image format very adequate for images and flat pictures, that was introduced by CompuServe and has come into usage for animated images.

Graceful degradation

Since  web  browsers  have  been  around  as  long  as  the  Web,  it  is  possible  to  have customers  viewing  your  web  pages  in  browsers  that  are  extremely  old  and  missing features of more modern browsers. Graceful degradation is a strategy of handling web page design for different browsers. A  web  design  that  is  built  to  gracefully  degrade  is  intended  to  be  viewed  first  by  the most modern browsers, and then as older, less feature­rich browsers view it it should degrade in a way that is still functional, but with fewer features. The  main  difference  between  the  graceful  degradation  strategy  and  progressive enhancement  is  where  you  start  your  design.  If  you  start  with  the  lowest  common denominator  and  then add features  for  more  modern  browsers  for  your  web  pages, you're using progressive enhancement. If you start with the most modern, cutting edge features, and then scale back, you're using graceful degradation.

Graceful  Degradation  Doesn't  Mean  Telling  Your  Readers,  "Download  the  Most Recent  Browser".  One  of  the  reasons  many  modern  designers  don't  like  the graceful  degradation  approach  is  because  it  often  turns  into  a  demand  that readers download the most modern browser for the page to work. But this is not graceful degradation. If you find yourself wanting to write "download browser X to get this feature to work", you have left the realm of graceful degradation and moved into browser­centric design.

A good rule of thumb is to follow the same rules for graceful degradation as you would for progressive enhancement:<br />1. Write valid, standards­compliant HTML<br />2. Use external style sheets for your designs and layout<br />3. Use externally linked scripts for interactivity<br />4. Make sure the content is accessible even to low­level browsers without CSS or JavaScript<br />Then  go  out  and  build  the  most  cutting­edge  design  you  can!  Just  make  sure  that  it  degrades  in  less  functional <br />browsers but still works.