Updates to flashing

guidelines/groups/animation-and-movement/avoid-physical-harm.md

@@ -1,7 +1,8 @@
 ---
 children:
-  - no-flashing
-  - no-flashing-no-exceptions
+  - no-flashing-over-threshold
+  - no-flashing-over-threshold-no-exceptions
+  - single-flash
   - no-visual-motion
   - no-visual-motion-no-exceptions
   - trigger-warning-available

guidelines/groups/animation-and-movement/avoid-physical-harm/no-flashing-over-threshold-no-exceptions.md

@@ -0,0 +1,29 @@
+---
+status: developing
+type: supplemental
+title: No flashing over threshold (no exceptions)
+issueLabel: No flashing (no exceptions)
+---
+
+All :term[flashes] are below the :term[general flash and red flash thresholds] without a minimum size.
+
+:::note
+There are people who may not know they are susceptible to photosensitive seizures, and people who may have a much larger view of content (zoomed in or with the display close to the eye).
+:::
+
+:::ednote
+<b>Method(s)</b>
+* Design content without using :term[flashing].
+:::
+
+:::tests
+<b>Procedure</b>
+
+For each instance of flashing:
+1. Is the :term[flashing] below the size threshold defined by the :term[general flash and red flash threshold]?
+2. Is the flashing below the frequency defined by the general flash and red flash threshold?
+
+
+<b>Expected results</b>
+* #1 or #2 is true
+:::

guidelines/groups/animation-and-movement/avoid-physical-harm/no-flashing-over-threshold.md

@@ -0,0 +1,38 @@
+---
+status: developing
+type: foundational
+issueLabel: No flashing
+---
+
+All :term[flashes] are below the :term[general flash and red flash thresholds].
+
+:::except-when
+- The flashing is :term[essential].
+:::
+
+:::note
+If there is an :term[accessibility supported] method of setting a user-preference to prevent flashing, the content can be considered to avoid flashing if that preference is respected.
+:::
+
+:::ednote
+There is research into the size and frequency metrics underway. The exact values are likely to change before WCAG3 is published.
+:::
+
+:::ednote
+<b>Method(s)</b>
+* Consider if :term[flashing] is :term[essential] and, if it is not, refrain from including it.
+* Ensure that (an accessibility supported) user-setting to avoid animation and flashing is respected
+* Ensure that any flashing is below [X] size in the users’ view.
+:::
+
+:::tests
+<b>Procedure</b>
+
+For each instance of flashing:
+1. Is the flashing :term[essential]?
+2. Does the flashing exceed the thresholds defined by the :term[general flash and red flash thresholds]?
+
+<b>Expected results</b>
+* #1 is true, or
+* #2 is false.
+:::

guidelines/groups/animation-and-movement/avoid-physical-harm/single-flash.md

@@ -0,0 +1,33 @@
+---
+status: exploratory
+type: foundational
+---
+
+Content does not include a change of contrast (over 4.5:1) going from light to dark (or dark to light) of more than 30% of the visible content area (viewport).
+
+:::except-when
+- A new :term[page]/:term[view] is loaded.
+- The flash is :term[essential].
+:::
+
+
+:::ednote
+This is a new provision for a big, intense, single on/off flash. This is reported as a trigger by group members, but we need data on this, and a definition that includes size/intensity to avoid including non-triggers such as menus.
+:::
+
+:::ednote
+<b>Method(s)</b>
+* Design content without large changes of contrast. For example, when a menu with a light background is opened, it opens over a light background. Videos do not go from a dark to light background in less than a second.
+:::
+
+:::tests
+<b>Procedure</b>
+
+For each change of contrast:
+1. Is the change of contrast triggered by a loading a new :term[page]/:term[view]?
+2. Is the change of contrast more than 4.5:1?
+3. Is the area of the change of contrast at least 30% of the viewport?
+
+<b>Expected results</b>
+* #1 is true, or #2 and #3 are false
+:::

informative/guidelines/animation-and-movement/avoid-physical-harm/single-flash.md

@@ -0,0 +1 @@
+## Tests