Page 80 - GIGW2

CH 06 Design

audio descriptions must be provided (if all of the information in the video
track is already provided in the audio track, no audio description is necessary)
WCAG 1.2.2 & 1.2.3.

6.7.3 Animations

The use of animation can be an effective means for drawing attention to
key aspects of a website. However, Government websites should ensure
that animations used on the site do not distract or irritate users or lead to
unacceptable download times. Animation should be used only if it adds value
to a page. File sizes of animated images should be kept small by limiting the
number of frames.

a. Certain special effects such as blinking or flashing have been reported to cause
epileptic seizures. It is also seen that people are more sensitive to red flashing
than other colours.Web pages MUST not contain anything that flashes more
than three times in any one second period. (Ref. WCAG 2.3.2)

b. For any moving, blinking or scrolling information that starts automatically and
lasts for more than 5 seconds and is presented in parallel with other content,
there MUST be a mechanism for the user to pause, stop, or hide it (unless the
movement, blinking, or scrolling is part of an activity where it is essential).
Many web pages also contain auto updating content that disappears or is
updated in a preset interval of time e.g. stock prices, news etc. In such case
also the user MUST have a mechanism to pause, stop or hide the content or to
control its frequency unless this auto updation is a part of an activity where it
is essential. (Ref. WCAG 2.2.2)

c. If any audio on a Web page plays automatically for more than 3 seconds,
there MUST be mechanism to pause or stop the audio. Individuals who use
screen reading software can find it hard to hear the speech output if there is
other audio playing at the same time. Also as screen readers speech output
is controlled via the same volume control as the system sound control the
webpage MUST provide a means to control the volume of audio playing in
the page independently from the overall system volume level. (Ref. WCAG 1.4.2)

6.8
Navigation

Consistent navigation makes it easy to use a website since a visitor does not need to
understand or remember different navigation styles for different sections. Therefore to
promote ease-of-use for all citizens, Government websites must have a navigation scheme
that is used consistently across the website.

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