Analysis of the table below:
There are no HTML techniques for this. The CSS Technique has an "AND" relationship to Guideline 2.3. In other words it would apply to both 1.2 & 1.3.
Guideline | Technology Independent Doc |
HTML Techniques | CSS | |
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Guideline 2.3 | 2.3: Allow users to avoid content that could cause photosensitive epileptic seizures. |
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Success Criteria 1: |
Level 1 Success Criteria for Guideline 2.3
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2.3.1 FlickerThis technique satisfies guideline(s):
Task:Ensure that users can avoid experiencing screen flicker.
A flickering or flashing screen may cause seizures in users with
photosensitive epilepsy and content developers should thus avoid
causing the screen to flicker. Seizures can be triggered by flickering
or flashing in the 4 to 59 flashes per second (Hertz) range with a
peak sensitivity at 20 flashes per second as well as quick changes
from dark to light (like strobe lights).
Editorial Note: A lot of this is now in the
Guidelines, need to discuss with the WCAG WG how much should here.
Also need information on testing and a reference to Trace's new
tool. (currently in the Guideline) depending on the resolution of
the WG.
Guideline 2.4 Facilitate the ability of users to orient themselves and move within the content. |
1.13 Text style effectsTask:@@
The following CSS2 properties can be used to style text:
Note. If blinking content (e.g., a headline that appears and disappears at regular intervals) is used, provide a mechanism for stopping the blinking. In CSS, 'text-decoration: blink' will cause content to blink and will allow users to stop the effect by turning off style sheets or overriding the rule in a user style sheet. Do not use the BLINK and MARQUEE elements. These elements are not part of any W3C specification for HTML (i.e., they are non-standard elements). |
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Success Criteria 2: |
Level 2 Success Criteria for Guideline 2.3
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Success Criteria 3: |
Level 3 Success Criteria for Guideline 2.3
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Informative |
Guideline 2.3 (flicker) Issues
Notes:
Editorial Note: A free tool will be available from the
University of Wisconsin's Trace Center that will carry out the above
analysis on Web content. The tool will be available by the second
quarter of 2004.
Who Benefits from Guideline 2.3 (Informative)
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