Explanation

The unknownFlashingHazard value indicates that a publisher has not yet checked for flashing hazards or is unsure whether some content might present a hazard.

This value should typically only be used as a temporary placeholder if a publication must be released before an accessibility review can be completed.

The unknownFlashingHazard value must never be set together with the none, flashing, or noFlashingHazard values, as these values conflict.

The unknownFlashingHazard value should not be set with the unknown value, as these values are redundant.

Examples

Example 1 — EPUB 3
<meta property="schema:accessibilityHazard">unknownFlashingHazard</meta>
<meta property="schema:accessibilityHazard">noMotionSimulationHazard</meta>
<meta property="schema:accessibilityHazard">noSoundHazard</meta>
Example 2 — EPUB 2
<meta name="schema:accessibilityHazard" content="unknownFlashingHazard"/>
<meta name="schema:accessibilityHazard" content="noMotionSimulationHazard"/>
<meta name="schema:accessibilityHazard" content="noSoundHazard"/>
Example 3 — Audiobooks
"accessibilityHazard": [
   "unknownFlashingHazard",
   "noMotionSimulationHazard",
   "noSoundHazard"
]

ONIX Mapping

The unknownFlashingHazard value maps to ONIX list 143 code 24 ("Flashing risk unknown").

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