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[css3-animations] Ease animation modes under-specified.

From: Alex Danilo <alex@abbra.com>
Date: Mon, 14 Feb 2011 20:56:38 +1100
Message-Id: <EAQLGL.95FNQ90LIAEF@abbra.com>
To: www-style@w3.org
Hello Style-afficonados,

	I've been reviewing the document at:

http://www.w3.org/TR/css3-animations/

	which is of course the CSS3 animations working draft.

	Section 2.1 describes 'Timing functions for keyframes'. In it
are 'animation-timing-function' properties called:

* 'ease-out'
* 'ease-in'
* ease

	All these property values have no definition for what they
are supposed to do. There is a vague English description about what
a UA should _try_ to do but no actual definition.

	Should the 'ease' set be a cubic spline function, a series
of connected linear interpolations, a quadratic?

	For interoperability, these need to be specified as a time
variant function that can be replicated across browsers. Reading WebKit
source will not suffice as a substitute.

	UA authors would appreciated clarification of the expected
behaviour.

Thanks in advance,
Alex
Received on Monday, 14 February 2011 09:57:09 GMT

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