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Adds prefers-reduced-motion media query #580

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Adds prefers-reduced-motion media query #580

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4f78c6f
adds `prefers-reduced-motion` media query
celsobonutti Jun 21, 2022
e2e7218
use phantom types for `prefers-reduced-motion`
celsobonutti Jun 21, 2022
7515fc3
adjusts `preferReducedMotion` docs
celsobonutti Jun 21, 2022
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42 changes: 42 additions & 0 deletions src/Css/Media.elm
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ module Css.Media exposing
, Fine, Coarse, fine, coarse, pointer, anyPointer, CanHover, canHover
, hover, anyHover
, InitialOnly, Enabled, initialOnly, enabled, scripting
, noPreference, prefersReducedMotion, reduce
)

{-| Functions for building [`@media` queries](https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries).
Expand Down Expand Up @@ -942,6 +943,47 @@ scripting value =
feature "scripting" value


{-| -}
type alias ReducedMotionPreference a =
{ a | value : String, reducedMotionPreference : Compatible }


{-| -}
type alias Reduce =
{ value : String, reducedMotionPreference : Compatible }


{-| -}
type alias NoPreference =
{ value : String, reducedMotionPreference : Compatible }


{-| The value [`reduce`](https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion).
-}
reduce : Reduce
reduce =
{ value = "reduce", reducedMotionPreference = Compatible }


{-| The value [`no-preference`](https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion).
-}
noPreference : NoPreference
noPreference =
{ value = "no-preference", reducedMotionPreference = Compatible }


{-| Media feature [`prefers-reduced-motion`](https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-motion).
Queries the if the user agent's has a preference for less motion on the page.
Accepts `reduce` or `noPreference`.

media (prefersReducedMotion reduce) [ a [ hover [ transform none ] ] ]

-}
prefersReducedMotion : ReducedMotionPreference a -> Expression
prefersReducedMotion value =
feature "prefers-reduced-motion" value



-- PRIVATE HELPERS --

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4 changes: 4 additions & 0 deletions tests/Media.elm
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Expand Up @@ -142,6 +142,10 @@ mediaFeatures =
, ( scripting initialOnly, "initial-only" )
, ( scripting Media.enabled, "enabled" )
]
, testFeature "prefers-reduced-motion"
[ ( prefersReducedMotion reduce, "reduce" )
, ( prefersReducedMotion noPreference, "no-preference" )
]
]


Expand Down