prefers-reduced-motion.html

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This WPT test may be referenced by the following Test IDs:
- /css/mediaqueries/prefers-reduced-motion.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<link rel="help" href="https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion" />

<script type="text/javascript" src="/resources/testharness.js"></script>

<script type="text/javascript" src="/resources/testharnessreport.js"></script>

<script type="text/javascript" src="resources/matchmedia-utils.js"></script>

<script>

query_should_be_known("(prefers-reduced-motion)");

query_should_be_known("(prefers-reduced-motion: no-preference)");

query_should_be_known("(prefers-reduced-motion: reduce)");

query_should_be_unknown("(prefers-reduced-motion: 0)");

query_should_be_unknown("(prefers-reduced-motion: none)");

query_should_be_unknown("(prefers-reduced-motion: 10px)");

query_should_be_unknown("(prefers-reduced-motion: no-preference reduce)");

query_should_be_unknown("(prefers-reduced-motion: reduced)");

query_should_be_unknown("(prefers-reduced-motion: no-preference/reduce)");

test(() => {

  // What this is saying is that 'no-preference' is not the default, so

  // irregardless of the current OS settings, (prefers-reduced-motion).matches

  // should not be equivalent to (prefers-reduced-motion: no-preference).matches.

  let booleanContext = window.matchMedia("(prefers-reduced-motion)");

  let noPreference = window.matchMedia("(prefers-reduced-motion: no-preference)");

  assert_equals(booleanContext.matches, !noPreference.matches);

}, "Check that no-preference evaluates to false in the boolean context");

</script>