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Add 'prefers-reduced-motion' media feature #586

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Add 'prefers-reduced-motion' media feature #586

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92de527
Add 'prefers-reduced-motion' media feature
grorg Oct 10, 2016
c2aa564
Remove 'none' from prefers-reduced-motion.
grorg Oct 11, 2016
f9c94b4
Change 'default' to 'no-preference'
grorg Jan 11, 2017
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48 changes: 47 additions & 1 deletion mediaqueries/Overview.bs
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Expand Up @@ -491,7 +491,7 @@ Evaluating Media Features in a Boolean Context</h4>
If the feature would be true for any value
<em>other than</em> the number ''0'',
a <<dimension>> with the value ''0'',
or the keyword ''none'',
or the keywords ''none'' and ''no-preference'',
the <a>media feature</a> evaluates to true.
Otherwise, it evaluates to false.

Expand Down Expand Up @@ -1783,6 +1783,52 @@ Rare Interaction Capabilities: the 'any-pointer' and 'any-hover' features</h3>
or to hide them altogether to reduce visual clutter if ''(any-pointer: fine)'' is false.
</div>



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<h2 id='mf-user-preferences'>
User Preference Media Features</h2>

<h3 id="prefers-reduced-motion">
Detecting the desire for less motion on the page: the 'prefers-reduced-motion' feature</h3>

<pre class='descdef mq'>
Name: prefers-reduced-motion
Value: no-preference | reduce
For: @media
Type: discrete
</pre>

The 'prefers-reduced-motion' media feature is used to detect if the user
has requested the system minimize the amount of animation or motion it
uses.

<dl dfn-type=value dfn-for="@media/prefers-reduced-motion">
<dt><dfn>no-preference</dfn>
<dd>
Indicates that the user has made no preference known
to the system. This keyword value evaluates as false
in the <a>boolean context</a>.

<dt><dfn>reduce</dfn>
<dd>
Indicates that user has notified the system that they
prefer an interface that minimizes the amount of movement
or animation, preferably to the point where all non-essential
movement is removed.

</dl>


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Maybe add a editorial note to the discussion in #442?

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I'd rather not do that, at least not without a summary of what you want people to go look for in that giant rambling of ours.

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