Transcript Blind Friendly Website

Blind Friendly Website
Helena Koláčková
Czech Statistical Office
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz
Basic statistics
 0.6 – 1.5 % of population – severe visual
handicap; 15 % of population – trouble with
color sense
 In the CR 60 thous. – 150 thous. people with
severe visual handicap (60 % seniors)
 of which 12 % totally blind
 c. 4 % use PC with special equipment
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz
Purblind and blind persons
on PC
 c. 4 000 people with severe visual handicap
in the CR use PC („only“ 4 % of all severe
visual handicapped)
 16 % alternative senses – voice and tactile
outputs
 22 % screen enlargement – software
magnifier
 62 % combination of both these
possibilities
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz
Software magnifier
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz
Cataracts
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz
Glaucoma
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz
Diabetic Rethinopathy
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz
Basic facts about web site displaying
to purblind and blind persons
 Information in the form of text only;
 Information on the web page must be linear;
 Control of computer and all applications
solely with use of a keyboard and keyboard
commands;
 Using the software magnifier, users can see
only a small portion of web page at the same
time.
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz
Basic rules
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Relative font size;
Graphical objects should have their textual alternative defined;
It is necessary to indicate, that the link opens a new window;
Each form element has descriptive heading attached to it;
Web page content structure – through the use of headings H1 –
H6;
Web sites using scripts, objects, applets, cascade style sheets,
images are accessible to visually impaired users even without
all these supplements;
Colors of the foreground and background have adequate
contrast;
Web page code can be validated according to W3C;
Nothing is blinking on a web page quicker than once per
second.
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz
Time demands
 Checking up validity of 3 – 5 thous. files
 It took about 3 months (4 people)
 continuous validity checking during Web site
up-dating
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz
World standards
 W3C – World Wide Web Consorcium
 Methodology WCAG – Web Content
Accessibility Guidelines 1.0 (WAI – Web
Accessibility Initiative)
 Section 508 (Act to require Federal agencies
to make their electronic and information
technology accessible to people with
disabilities)
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz
Conclusion
Web pages adaptation to
accessible website
standards is not „only“
important for purblind
and blind persons, but it
can also help to other
handicapped groups.
 Aurally handicapped
 Locomotive
handicapped
 Users with displaying
problems
 Persons with
concentration problems
 Search engines
crawlers
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz
Thank you for your attention
[email protected]
CZECH STATISTICAL OFFICE
Na padesátém 81, CZ - 100 82 Praha 10, Czech Republic
www.czso.cz