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[css-animations-2] Make animation-duration:auto resolve to 0s for legacy compat #6530 #8952

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Jun 29, 2023
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[css-animations-2] Make animation-duration:auto resolve to 0s for legacy compat #6530 #8952

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6 changes: 6 additions & 0 deletions css-animations-2/Overview.bs
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Expand Up @@ -462,6 +462,12 @@ Declaring Animations</h2>
However, if 'animation-fill-mode' is set to ''animation-fill-mode/none''
the keyframes of the animation animation will have no noticeable effect.

For backwards-compatibility with Level 1,
when the [=computed value=] of 'animation-timeline' is ''animation-timeline/auto''
(i.e. only one list value, and that value being ''animation-timeline/auto''),
the [=resolved value=] of ''animation-duration/auto'' for 'animation-duration'
is ''0s'' whenever its [=used value=] would also be ''0s''.

## The 'animation-timing-function' property ## {#animation-timing-function}

The 'animation-timing-function' is used to determine the [=timing function=]
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