[css-transforms-1] transform presentation attribute may be start/end value of CSS Transitions. w3c#2684

Author: dirkschulze

css-transforms-1/Overview.bs

@@ -796,9 +796,7 @@ SVG transform functions of the <a element-attr for>transform</a>, <{pattern/patt
 
 The SVG transform function <a href="#svg-rotate">rotate</a> with 3 values can not be mapped to a corresponding CSS <<transform-function>>. The 2 optional number values represent a horizontal translation value ''cx'' followed by a vertical translation value ''cy''. Both number values get interpreted as CSS <<length>> types with ''px'' units and define the origin for rotation. The behavior is equivalent to an initial translation by ''cx'', ''cy'', a rotation defined by the first number value interpreted as <<angle>> type with ''deg'' unit followed by a translation by ''-cx'', ''-cy''.
 
-If the value of a <a element-attr for>transform</a> attribute is the start or end value of a CSS Transition and the SVG <a href="svg-transform-list">transform list</a> contains at least one <a href="#svg-rotate">rotate</a> transform function with 3 values, the individual SVG transform functions must get <a>post-multiplied</a> and the resulting matrix must get mapped to a <<matrix()>> CSS <<transform-function>> and used as start/end value of the CSS Transition.
-
-Issue(w3c/csswg-drafts#2684): Implementations differ. More testing is required.
+A <a element-attr for>transform</a> attribute can be the start or end value of a CSS Transition. If the value of a <a element-attr for>transform</a> attribute is the start or end value of a CSS Transition and the SVG <a href="svg-transform-list">transform list</a> contains at least one <a href="#svg-rotate">rotate</a> transform function with 3 values, the individual SVG transform functions must get <a>post-multiplied</a> and the resulting matrix must get mapped to a <<matrix()>> CSS <<transform-function>> and used as start/end value of the CSS Transition.
 
 User coordinate space {#svg-user-coordinate-space}
 --------------------------------------------------
@@ -1473,6 +1471,7 @@ The following changes were made since the <a href="https://www.w3.org/TR/2017/WD
 * Remove 3-value <<rotate()>> from transform function primitives.
 * Be more specific about computation of [=transformation matrix=] and [=current transformation matrix=].
 * Define reference box for paint servers and <{clipPath}> element.
+* Specify behavior of transform presentation attribute with 3-value-rotate as start or end value of a transition.
 * Editorial changes.
 
 <h2 class=no-num id='acknowledgments'>Acknowledgments</h2>