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Re: [csswg-drafts] [css-transforms-1] Neutral element for addition wrt animating transforms

From: Brian Birtles via GitHub <sysbot+gh@w3.org>
Date: Tue, 09 Jan 2018 05:19:41 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-356183123-1515475180-sysbot+gh@w3.org>
Sorry, looking at the mails linked to in this thread, this issue appears to be referring to SMIL. I [argued about a decade ago](https://birtles.wordpress.com/animatetransform-issues/by-animation-and-scale-transformations/) that the underlying value for scale should be 1 in SMIL. The SVG 1.2 Tiny test suite, however, used zero so I made Firefox follow that. I don't know if it's worth trying to fix SMIL now, or at least not `<animateTransform>`. We could try to fix it for `<animate>` I guess.

The ["neutral value for composition"](https://drafts.csswg.org/web-animations-1/#neutral-value-for-composition) is something internal to Web Animations. It's just a roundabout way of saying, "use the underlying value". It should probably be dropped and it doesn't need to be defined here. I would just say that for SVG animation, the underlying value used for a by-animation of transform is a zero matrix.

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Received on Tuesday, 9 January 2018 05:19:46 UTC

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