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Truth is, I don't know what percentage of users have Flash or online PDF
readers.
Even in 1990 the w3c site gives:
"In September 2000, NPD Research, the parent company of MediaMetrix,
conducted a study to determine what percentage of Web browsers have
Flash preinstalled. The results show that 96.4% of Web users can
experience Macromedia Flash content without having to download and
install a player."
As of now, Adobe says it is about 99% for several of the most
developed nations. See: http://www.adobe.com/products/player_census/flashplayer/
.. I would guess the more important question today might be how many
people have flash blocked. If blocked, it likely is much easier to get
people to turn flash on if they need it for the site than it is to get
them to download it.
Adobe likely has info somewhere about the penetration of their pdf
reader, but I did not have time to hunt through the huge Adobe site
for this. My impression that it likely is installed on a very high
percentage of computers that are used online, and Adobe even has
special edition of their reader for portable devices. I suppose some
might have pdf turned off, but I have seen no data concerning this.
The local newspaper I read, not a major one, now offers an online
subscription to their full newspaper on their web site, and I
subscribed to it. It is all in pdf. It is quite easy to read, and even
easier to read on a large screen HD TV I have connected to the
computer using a standard computer monitor conection - not a low
resolution s-video connection. With a wireless keyboard and mouse at
an easy chair, it is much easier to read than a print version of the
paper. It is easy to jump to different sections of the paper and to
individual pages within each section. Graphics are more than good
enough, considering the low resolution used for images in many
newspapers. The main thing missing, likely important to a few, is the
ability to fill in the crossword puzzle online, so one has to print
out the puzzle. However it is quite easy to allow adding text writing
ability to a pdf document. For example, the US federal income tax site
allows you to fill out many of the most needed forms online and print
out the completed form if you wish.
Many scientific journal now are published in online editions in pdf as
well as in printed editions. The online edition often is considerably
less expensive than the printed version.
No matter what you do, someone, somewhere, likely will not be able to
use it. Although I have not heard of it, it would not even surprise me
if someone wrote a program to block text. Perhaps that would be a hit
for avid porn viewers so they would not have to be bothered by text
and could concentrate only on images of the "hard stuff" .