Transcript Click on your choice now: [Link] [Link]

Making The Web Usable
By Everyone
(Including people with disabilities,
people with slow net connections,
people with broken mice, etc.)
Gregory C. Lowney, Microsoft Corporation, Human Factors and the World Wide Web Confernce, October 30, 1996
Which would you choose?
Click on your choice now:
[Link]
[Link]
Many users cannot see graphic images. They may be
using text-mode browsers, or have turned off graphics to
speed up performance on slow connections, and rely on
speech or Braille output.
Provide descriptions for all images using the ALT attribute.
Click where?
Click on your state to
get more information
[Image]
What is going on here?
Tables are used for Frames are used for
positioning text and dividing the window
graphics in rows into regions that are
and columns. scrolled independently.
Screen reader utilities use synthesized speech or a Braille
display to read a page for individuals who are blind. They
based solely on the text on the screen, oblivious to the fact
that one line of text spans multiple columns.
Provide an alternate page that does not rely on frames or
tables.
HELP!
Select a driver
(WARNING: drivers shown in red
are dangerously unstable and
should not be used)
• Install Version 6
• Install Version 7
• Install Version 8
Some users won’t be able to see the colors you
choose. They may be color blind, or relying on voice
output rather than seeing the screen directly, or using
a text mode web browser.
Don’t convey important information by color alone.
Was this author very confused?
as designers we demand...
as designers we demand...
~2~
~2~
the ability to control
the presentation of a
Web document...
You can achieve spectacular effects by creative use of style
sheets. However, these are lost on users who rely on voice
output, use browsers that don’t support style sheets, or apply
their own style sheets to make pages more legible.
Make sure your web pages are usable when style sheets are
turned off.
Select one what?
Choose a link:
•Click here
•Click here
•This
•Jump
Some tools present a drop-down menu of all the links
on a page, or recognize when the user speaks the
name of a link. If several links have the same name,
or the names are ambiguous or too generic, such
lists become unusable.
Give all links names that are brief and can be
understood out of context.
Please read carefully
This is an example of text that is extremely difficult for most people to read. That
results from the combination of type face, the size, style, and the combination of
foreground and background colors. If you could control the display attributes you
could make it easier to read on your own computer, but when the author uses
fixed font attributes it can leave the user feeling frustrated, angry, and
unenlightened.
Text that seems legible to one person may be unreadable
to another. Many people with low vision need to adjust
their browser options to show text as bright text on a black
background, or use large or sans-serif fonts. If you hardcode text attributes, it can be as hard for them as the
previous view was for you.
Provide an alternative to hard-coded font attributes;
use style sheets when possible.