Editorial: define isIdentity in terms of internal variables; rename 'is2D' internal variable to 'is 2D'

Author: zcorpan

geometry/Overview.bs

@@ -799,7 +799,7 @@ element</dfn>, <dfn dfn-for=matrix>m22 element</dfn>, <dfn dfn-for=matrix>m23 el
 dfn-for=matrix>m24 element</dfn>, <dfn dfn-for=matrix>m31 element</dfn>, <dfn dfn-for=matrix>m32
 element</dfn>, <dfn dfn-for=matrix>m33 element</dfn>, <dfn dfn-for=matrix>m34 element</dfn>, <dfn
 dfn-for=matrix>m41 element</dfn>, <dfn dfn-for=matrix>m42 element</dfn>, <dfn dfn-for=matrix>m43
-element</dfn>, <dfn dfn-for=matrix>m44 element</dfn> and <a for=matrix>is2D</a>.
+element</dfn>, <dfn dfn-for=matrix>m44 element</dfn> and <a for=matrix>is 2D</a>.
 {{DOMMatrixReadOnly}} as well as the inheriting interface {{DOMMatrix}} must be able to access and
 set the value of these variables.
 
@@ -906,7 +906,7 @@ they have identical IEEE 754 double-precision bit patterns.
 
  <li><p>Set <a for=matrix>m33 element</a> and <a for=matrix>m44 element</a> to ''1''.
 
- <li><p>Set <a for=matrix>is2D</a> to <code>true</code>.
+ <li><p>Set <a for=matrix>is 2D</a> to <code>true</code>.
 
  <li><p>Return <var>matrix</var>
 </ol>
@@ -920,7 +920,7 @@ they have identical IEEE 754 double-precision bit patterns.
  <li><p>Set <a for=matrix>m11 element</a> to <a for=matrix>m44 element</a> to the values of
  <var>init</var> in column-major order.
 
- <li><p>Set <a for=matrix>is2D</a> to <code>false</code>.
+ <li><p>Set <a for=matrix>is 2D</a> to <code>false</code>.
 
  <li><p>Return <var>matrix</var>
 </ol>
@@ -1086,7 +1086,7 @@ method on {{DOMMatrix}} must follow these steps:
 {{DOMMatrixReadOnly/m23}}, {{DOMMatrixReadOnly/m43}}, {{DOMMatrixReadOnly/m14}},
 {{DOMMatrixReadOnly/m24}}, {{DOMMatrixReadOnly/m34}} are set to something else than ''0'' or
 {{DOMMatrixReadOnly/m33}}, {{DOMMatrixReadOnly/m44}} are set to something else than ''1'' set <a
-for=matrix>is2D</a> to <code>false</code>.
+for=matrix>is 2D</a> to <code>false</code>.
 
 <div dfn-type=attribute dfn-for="DOMMatrixReadOnly, DOMMatrix">
  <p>The <dfn><code>m11</code></dfn> attribute, on getting, must return the <a for=matrix>m11
@@ -1190,19 +1190,19 @@ for=matrix>is2D</a> to <code>false</code>.
 <p>The following attributes provide status information about {{DOMMatrixReadOnly}}.
 
 <div dfn-type=attribute dfn-for=DOMMatrixReadOnly>
- <p>The <dfn><code>is2D</code></dfn> attribute must return the value of <a for=matrix>is2D</a>.
-
- <p>The <dfn><code>isIdentity</code></dfn> attribute must return <code>true</code> if
- {{DOMMatrixReadOnly/m12}}, {{DOMMatrixReadOnly/m13}}, {{DOMMatrixReadOnly/m14}},
- {{DOMMatrixReadOnly/m21}}, {{DOMMatrixReadOnly/m23}}, {{DOMMatrixReadOnly/m24}},
- {{DOMMatrixReadOnly/m31}}, {{DOMMatrixReadOnly/m32}}, {{DOMMatrixReadOnly/m34}},
- {{DOMMatrixReadOnly/m41}}, {{DOMMatrixReadOnly/m42}}, {{DOMMatrixReadOnly/m43}} are ''0'' and
- {{DOMMatrixReadOnly/m11}}, {{DOMMatrixReadOnly/m22}}, {{DOMMatrixReadOnly/m33}},
- {{DOMMatrixReadOnly/m44}} are ''1''. Otherwise it must return <code>false</code>.
+ <p>The <dfn><code>is2D</code></dfn> attribute must return the value of <a for=matrix>is 2D</a>.
+
+ <p>The <dfn><code>isIdentity</code></dfn> attribute must return <code>true</code> if <a
+ for=matrix>m12 element</a>, <a for=matrix>m13 element</a>, <a for=matrix>m14 element</a>, <a
+ for=matrix>m21 element</a>, <a for=matrix>m23 element</a>, <a for=matrix>m24 element</a>, <a
+ for=matrix>m31 element</a>, <a for=matrix>m32 element</a>, <a for=matrix>m34 element</a>, <a
+ for=matrix>m41 element</a>, <a for=matrix>m42 element</a>, <a for=matrix>m43 element</a> are ''0''
+ and <a for=matrix>m11 element</a>, <a for=matrix>m22 element</a>, <a for=matrix>m33 element</a>, <a
+ for=matrix>m44 element</a> are ''1''. Otherwise it must return <code>false</code>.
 </div>
 
 <p>Every {{DOMMatrixReadOnly}} object must be flagged with a boolean <dfn for=matrix
-export>is2D</dfn>. This flag indicates that:
+export>is 2D</dfn>. This flag indicates that:
 
 <ol>
  <li><p>The current matrix was initialized as a 2D matrix. See individual <a
@@ -1211,10 +1211,10 @@ export>is2D</dfn>. This flag indicates that:
  <li><p>Only 2D transformation operations were applied. Each <a
  href="#mutable-transformation-methods">mutable</a> or <a
  href="#immutable-transformation-methods">immutable transformation method</a> defines if <a
- for=matrix>is2D</a> must be set to <code>false</code>.
+ for=matrix>is 2D</a> must be set to <code>false</code>.
 </ol>
 
-<p class=note><a for=matrix>is2D</a> can never be set to <code>true</code> when it was set to
+<p class=note><a for=matrix>Is 2D</a> can never be set to <code>true</code> when it was set to
 <code>false</code> before on a {{DOMMatrix}} object with the exception of calling the
 {{DOMMatrix/setMatrixValue()}} method.
 
@@ -1420,7 +1420,7 @@ export>is2D</dfn>. This flag indicates that:
  <dt><dfn>stringifier()</dfn>
  <dd>
   <dl class=switch>
-    <dt>If <a for=matrix>is2D</a> is <code>true</code>
+    <dt>If <a for=matrix>is 2D</a> is <code>true</code>
     <dd><p>Return a DOMString in the form of a CSS Transforms <<matrix()>> function where <var
     ignore>a</var> is {{DOMMatrixReadOnly/a}} attribute, <var ignore>b</var> is
     {{DOMMatrixReadOnly/b}} attribute, <var ignore>c</var> is {{DOMMatrixReadOnly/c}} attribute,
@@ -1503,8 +1503,8 @@ user agents.
 
    <li><p>The <var>otherObject</var> matrix gets post-multiplied to the current matrix.
 
-   <li><p>If <a for=matrix>is2D</a> of <var>otherObject</var> is <code>false</code>, set <a
-   for=matrix>is2D</a> of the current matrix to <code>false</code>.
+   <li><p>If <a for=matrix>is 2D</a> of <var>otherObject</var> is <code>false</code>, set <a
+   for=matrix>is 2D</a> of the current matrix to <code>false</code>.
 
    <li><p>Return the current matrix.
   </ol>
@@ -1517,8 +1517,8 @@ user agents.
 
    <li><p>The <var>otherObject</var> matrix gets pre-multiplied to the current matrix.
 
-   <li><p>If <a for=matrix>is2D</a> of <var>otherObject</var> is <code>false</code>, set <a
-   for=matrix>is2D</a> of the current matrix to <code>false</code>.
+   <li><p>If <a for=matrix>is 2D</a> of <var>otherObject</var> is <code>false</code>, set <a
+   for=matrix>is 2D</a> of the current matrix to <code>false</code>.
 
    <li><p>Return the current matrix.
   </ol>
@@ -1530,7 +1530,7 @@ user agents.
    matrix is <a href="https://drafts.csswg.org/css-transforms-1/#Translate3dDefined">described</a>
    in CSS Transforms. [[!CSS3-TRANSFORMS]]
 
-   <li><p>If <var>tz</var> is specified and not ''0'', set <a for=matrix>is2D</a> of the current
+   <li><p>If <var>tz</var> is specified and not ''0'', set <a for=matrix>is 2D</a> of the current
    matrix to <code>false</code>.
 
    <li><p>Return the current matrix.
@@ -1556,7 +1556,7 @@ user agents.
    arguments <var>originX</var>, <var>originY</var>, <var>originZ</var>.
 
    <li><p>If <var>scaleZ</var> is not ''1'' or <var>originZ</var> is not ''0'', set <a
-   for=matrix>is2D</a> of the current matrix to <code>false</code>.
+   for=matrix>is 2D</a> of the current matrix to <code>false</code>.
 
    <li><p>Return the current matrix.
   </ol>
@@ -1577,7 +1577,7 @@ user agents.
    <li><p>Apply a {{DOMMatrix/translateSelf()}} transformation to the current matrix with the
    arguments -<var>originX</var>, -<var>originY</var>, -<var>originZ</var>.
 
-   <li><p>If <var>scale</var> is not ''1'', set <a for=matrix>is2D</a> of the current matrix to
+   <li><p>If <var>scale</var> is not ''1'', set <a for=matrix>is 2D</a> of the current matrix to
    <code>false</code>.
 
    <li><p>Return the current matrix.
@@ -1593,7 +1593,7 @@ user agents.
 
    <li><p>If <var>rotZ</var> is still missing, set <var>rotZ</var> to zero.
 
-   <li><p>If <var>rotX</var> or <var>rotY</var> are non-zero, set <a for=matrix>is2D</a> of the
+   <li><p>If <var>rotX</var> or <var>rotY</var> are non-zero, set <a for=matrix>is 2D</a> of the
    current matrix to <code>false</code>.
 
    <li><p>Post-multiply a rotation transformation on the current matrix around the vector 0, 0, 1 by
@@ -1637,7 +1637,7 @@ user agents.
    href="https://drafts.csswg.org/css-transforms-1/#Rotate3dDefined">described</a> in CSS Transforms
    with <var>alpha</var> = <var>angle</var> in degrees. [[!CSS3-TRANSFORMS]]
 
-   <li><p>If <var>x</var> or <var>y</var> are not ''0'', set <a for=matrix>is2D</a> of the current
+   <li><p>If <var>x</var> or <var>y</var> are not ''0'', set <a for=matrix>is 2D</a> of the current
    matrix to <code>false</code>.
 
    <li><p>Return the current matrix.
@@ -1671,7 +1671,7 @@ user agents.
    <li><p>Invert the current matrix.
 
    <li><p>If the current matrix is not invertible set all attributes to ''NaN'' and set <a
-   for=matrix>is2D</a> to <code>false</code>.
+   for=matrix>is 2D</a> to <code>false</code>.
 
    <li><p>Return the current matrix.
   </ol>
@@ -1693,9 +1693,9 @@ user agents.
    <li><p>If <var>parsedValue</var> is ''transform/none'', set <var>parsedValue</var> to a
    <<transform-list>> containing a single identity matrix
 
-   <li><p>Set <a for=matrix>is2D</a> to <code>false</code> if the <<transform-list>> consists of any
+   <li><p>Set <a for=matrix>is 2D</a> to <code>false</code> if the <<transform-list>> consists of any
    <a href="https://drafts.csswg.org/css-transforms-1/#three-d-transform-functions">3D Transform
-   functions</a>. Otherwise set <a for=matrix>is2D</a> to <code>true</code>.
+   functions</a>. Otherwise set <a for=matrix>is 2D</a> to <code>true</code>.
 
    <li><p>Transform all <<transform-function>>s to 4x4 matrices by following the “<a
    href="https://drafts.csswg.org/css-transforms-1/#mathematical-description">Mathematical