[css-transforms-1][editorial] Export 'identity transform' for convenience.

Author: tabatkins

css-transforms-1/Overview.bs

@@ -138,7 +138,7 @@ Terminology {#terminology}
 
 When used in this specification, terms have the meanings assigned in this section.
 
-<div data-export>
+<div export>
     : <dfn>transformable element</dfn>
     :: A transformable element is an element in one of these categories:
         * all elements whose layout is governed by the CSS box model except for non-replaced inline boxes, table-column boxes, and table-column-group boxes [[!CSS2]],
@@ -162,7 +162,7 @@ When used in this specification, terms have the meanings assigned in this sectio
     : <dfn>2D matrix</dfn>
     ::  A 3x2 transformation matrix, or a 4x4 matrix where the items m<sub>31</sub>, m<sub>32</sub>, m<sub>13</sub>, m<sub>23</sub>, m<sub>43</sub>, m<sub>14</sub>, m<sub>24</sub>, m<sub>34</sub> are equal to ''0'' and m<sub>33</sub>, m<sub>44</sub> are equal to ''1''.
 
-    : <dfn>identity transform function</dfn>
+    : <dfn lt="identity transform function|identity transform">identity transform function</dfn>
     :: A <a href="#transform-functions">transform function</a> that is equivalent to a identity 4x4 matrix (see <a href="#mathematical-description">Mathematical Description of Transform Functions</a>). Examples for identity transform functions are ''translate(0)'', ''translateX(0)'', ''translateY(0)'', ''scale(1)'', ''scaleX(1)'', ''scaleY(1)'', ''rotate(0)'', ''skew(0, 0)'', ''skewX(0)'', ''skewY(0)'' and ''matrix(1, 0, 0, 1, 0, 0)''.
 
     : <dfn>post-multiply</dfn>