[css-transforms-1] Clarify use matrix entry index order in pseudo-code #924

Author: dirkschulze

css-transforms-1/Overview.bs

@@ -376,9 +376,9 @@ Issue(w3c/csswg-drafts#892): Clarify what the reference box of paint servers, <a
 
 A reference box adds an additional offset to the origin specified by the 'transform-origin' property.
 
-For SVG elements without an associated CSS layout box, the [=used value=] for <a value for=transform-box>border-box</a> is <a value for=transform-box>view-box</a>.
+For SVG elements without an associated CSS layout box, the [=used value=] for ''transform-box/border-box'' is ''transform-box/view-box''.
 
-For elements with an associated CSS layout box, the [=used value=] for <a value for=transform-box>fill-box</a> and <a value for=transform-box>view-box</a> is <a value for=transform-box>border-box</a>.
+For elements with an associated CSS layout box, the [=used value=] for ''transform-box/fill-box'' and ''transform-box/view-box'' is ''transform-box/border-box''.
 
 
 The SVG <a element-attr for>transform</a> Attribute {#svg-transform}
@@ -1158,7 +1158,7 @@ Decomposition also makes use of the following function:
 
 The pseudo code below is based upon the "unmatrix" method in "Graphics Gems II, edited by Jim Arvo".
 
-Issue(w3c/csswg-drafts#924): Clarify column/row order for matrix in pseudo code.
+Matrices in the pseudo code use the column-major order. The first index on a matrix entry represents the column and the second index represents the row.
 
 Issue(w3c/csswg-drafts#483): Incorrect indices for matrix?
 
@@ -1278,7 +1278,9 @@ Afterwards, each component of the decomposed values translation, scale, angle, m
 
 <h4 id="recomposing-to-a-2d-matrix">Recomposing to a 2D matrix</h4>
 
-After interpolation, the resulting values are used to transform the elements user space. One way to use these values is to recompose them into a 4x4 matrix. This can be done following the pseudo code below:
+After interpolation, the resulting values are used to transform the elements user space. One way to use these values is to recompose them into a 4x4 matrix. This can be done following the pseudo code below.
+
+Matrices in the pseudo code use the column-major order. The first index on a matrix entry represents the column and the second index represents the row.
 
 <pre>
 Input:  translation ; a 2 component vector
@@ -1391,6 +1393,7 @@ The following changes were made since the <a href="https://www.w3.org/TR/2017/WD
 * Added <a href="#priv-sec">privacy and security</a> section.
 * Use [[SVG2]] definitions for <a>transformable elements</a>.
 * Added special syntax for <a element-attr for>transform</a>, <{linearGradient/gradientTransform}> and <{pattern/patternTransform}> attributes.
+* Clarify index order of matrix entries in pseudo-code.
 
 ISSUE: Add all changes.