Actually require is 2D to be set to false in m13 setter

There was no "must" to set is 2D for m13 etc setters, and it was
stated "at a distance". This makes it a requirement, inline with
the definition for each setter.

Author: zcorpan

geometry/Overview.bs

@@ -157,24 +157,20 @@ steps:
 
 <div dfn-type=attribute dfn-for="DOMPointReadOnly, DOMPoint">
  <p>The <dfn><code>x</code></dfn> attribute, on getting, must return the <a for=point>x
- coordinate</a> value of the object it was invoked on. For the {{DOMPoint}} interface, setting the
- {{DOMPoint/x}} attribute must set the <a for=point>x coordinate</a> value of the object it was
- invoked on to the new value.
+ coordinate</a> value. For the {{DOMPoint}} interface, setting the
+ {{DOMPoint/x}} attribute must set the <a for=point>x coordinate</a> to the new value.
 
  <p>The <dfn><code>y</code></dfn> attribute, on getting, must return the <a for=point>y
- coordinate</a> value of the object it was invoked on. For the {{DOMPoint}} interface, setting the
- {{DOMPoint/y}} attribute must set the <a for=point>y coordinate</a> value of the object it was
- invoked on to the new value.
+ coordinate</a> value. For the {{DOMPoint}} interface, setting the
+ {{DOMPoint/y}} attribute must set the <a for=point>y coordinate</a> to the new value.
 
  <p>The <dfn><code>z</code></dfn> attribute, on getting, must return the <a for=point>z
- coordinate</a> value of the object it was invoked on. For the {{DOMPoint}} interface, setting the
- {{DOMPoint/z}} attribute must set the <a for=point>z coordinate</a> value of the object it was
- invoked on to the new value.
+ coordinate</a> value. For the {{DOMPoint}} interface, setting the
+ {{DOMPoint/z}} attribute must set the <a for=point>z coordinate</a> to the new value.
 
  <p>The <dfn><code>w</code></dfn> attribute, on getting, must return the <a for=point>w
- perspective</a> value of the object it was invoked on. For the {{DOMPoint}} interface, setting the
- {{DOMPoint/w}} attribute must set the <a for=point>w perspective</a> value of the object it was
- invoked on to the new value.
+ perspective</a> value. For the {{DOMPoint}} interface, setting the
+ {{DOMPoint/w}} attribute must set the <a for=point>w perspective</a> to the new value.
 </div>
 
 <p>The <dfn dfn-type=method dfn-for=DOMPointReadOnly>matrixTransform(<var>matrix</var>)</dfn>
@@ -340,40 +336,33 @@ steps:
 
 <div dfn-type=attribute dfn-for="DOMRectReadOnly DOMRect">
  <p>The <dfn><code>x</code></dfn> attribute, on getting, must return the <a for=rectangle>x
- coordinate</a> value of the object it was invoked on. For the {{DOMRect}} interface, setting the
- {{DOMRect/x}} attribute must set the <a for=rectangle>x coordinate</a> value of the object it was
- invoked on to the new value.
+ coordinate</a> value. For the {{DOMRect}} interface, setting the
+ {{DOMRect/x}} attribute must set the <a for=rectangle>x coordinate</a> to the new value.
 
  <p>The <dfn><code>y</code></dfn> attribute, on getting, it must return the <a for=rectangle>y
- coordinate</a> value of the object it was invoked on. For the {{DOMRect}} interface, setting the
- {{DOMRect/y}} attribute must set the <a for=rectangle>y coordinate</a> value of the object it was
- invoked on to the new value.
+ coordinate</a> value. For the {{DOMRect}} interface, setting the
+ {{DOMRect/y}} attribute must set the <a for=rectangle>y coordinate</a> to the new value.
 
  <p>The <dfn><code>width</code></dfn> attribute, on getting, must return the <a for=rectangle>width
- dimension</a> value of the object it was invoked on. For the {{DOMRect}} interface, setting the
- {{DOMRect/width}} attribute must set the <a for=rectangle>width dimension</a> value of the object
- it was invoked on to the new value.
+ dimension</a> value. For the {{DOMRect}} interface, setting the
+ {{DOMRect/width}} attribute must set the <a for=rectangle>width dimension</a> to the new value.
 
  <p>The <dfn><code>height</code></dfn> attribute, on getting, must return the <a
  for=rectangle>height dimension</a> value. For the {{DOMRect}} interface, setting the
  {{DOMRect/height}} attribute must set the <a for=rectangle>height dimension</a> value to the new
  value.
 
  <p>The <dfn><code>top</code></dfn> attribute, on getting, must return min(<a for=rectangle>y
- coordinate</a>, <a for=rectangle>y coordinate</a> + <a for=rectangle>height dimension</a>) of the
- object it was invoked on.
+ coordinate</a>, <a for=rectangle>y coordinate</a> + <a for=rectangle>height dimension</a>).
 
  <p>The <dfn><code>right</code></dfn> attribute, on getting, must return max(<a for=rectangle>x
- coordinate</a>, <a for=rectangle>x coordinate</a> + <a for=rectangle>width dimension</a>) of the
- object it was invoked on.
+ coordinate</a>, <a for=rectangle>x coordinate</a> + <a for=rectangle>width dimension</a>).
 
  <p>The <dfn><code>bottom</code></dfn> attribute, on getting, must return max(<a for=rectangle>y
- coordinate</a>, <a for=rectangle>y coordinate</a> + <a for=rectangle>height dimension</a>) of the
- object it was invoked on.
+ coordinate</a>, <a for=rectangle>y coordinate</a> + <a for=rectangle>height dimension</a>).
 
  <p>The <dfn><code>left</code></dfn> attribute, on getting, must return min(<a for=rectangle>x
- coordinate</a>, <a for=rectangle>x coordinate</a> + <a for=rectangle>width dimension</a>) of the
- object it was invoked on.
+ coordinate</a>, <a for=rectangle>x coordinate</a> + <a for=rectangle>width dimension</a>).
 </div>
 
 <p>For historical reasons, {{Window}} objects must also have a writable, configurable,
@@ -1078,93 +1067,88 @@ method on {{DOMMatrix}} must follow these steps:
 <h3 id=dommatrix-attributes>DOMMatrix attributes</h3>
 
 <p>The following attributes {{DOMMatrixReadOnly/m11}} to {{DOMMatrixReadOnly/m44}} correspond to the
-16 items of the matrix interfaces. For the {{DOMMatrix}} interface, if the attributes
-{{DOMMatrixReadOnly/m13}}, {{DOMMatrixReadOnly/m14}}, {{DOMMatrixReadOnly/m23}},
-{{DOMMatrixReadOnly/m24}}, {{DOMMatrixReadOnly/m31}}, {{DOMMatrixReadOnly/m32}},
-{{DOMMatrixReadOnly/m34}}, or {{DOMMatrixReadOnly/m43}} are set to something else than ''0'' or
-{{DOMMatrixReadOnly/m33}}, {{DOMMatrixReadOnly/m44}} are set to something else than ''1'' set <a
-for=matrix>is 2D</a> to <code>false</code>.
+16 items of the matrix interfaces.
 
 <div dfn-type=attribute dfn-for="DOMMatrixReadOnly, DOMMatrix">
  <p>The <dfn><code>m11</code></dfn> and <dfn><code>a</code></dfn> attributes, on getting, must
- return the <a for=matrix>m11 element</a> value of the object it was invoked on. For the
- {{DOMMatrix}} interface, setting the {{DOMMatrix/m11}} or the {{DOMMatrix/a}} attribute must set
- the <a for=matrix>m11 element</a> value of the object it was invoked on to the new value.
+ return the <a for=matrix>m11 element</a> value. For the {{DOMMatrix}} interface, setting the
+ {{DOMMatrix/m11}} or the {{DOMMatrix/a}} attribute must set the <a for=matrix>m11 element</a> to
+ the new value.
 
  <p>The <dfn><code>m12</code></dfn> and <dfn><code>b</code></dfn> attributes, on getting, must
- return the <a for=matrix>m12 element</a> value of the object it was invoked on. For the
- {{DOMMatrix}} interface, setting the {{DOMMatrix/m12}} or the {{DOMMatrix/b}} attribute must set
- the <a for=matrix>m12 element</a> value of the object it was invoked on to the new value.
+ return the <a for=matrix>m12 element</a> value. For the {{DOMMatrix}} interface, setting the
+ {{DOMMatrix/m12}} or the {{DOMMatrix/b}} attribute must set the <a for=matrix>m12 element</a> to
+ the new value.
 
  <p>The <dfn><code>m13</code></dfn> attribute, on getting, must return the <a for=matrix>m13
- element</a> value of the object it was invoked on. For the {{DOMMatrix}} interface, setting the
- {{DOMMatrix/m13}} attribute must set the <a for=matrix>m13 element</a> value of the object it was
- invoked on to the new value.
+ element</a> value. For the {{DOMMatrix}} interface, setting the {{DOMMatrix/m13}} attribute must
+ set the <a for=matrix>m13 element</a> to the new value and, if the new value is not ''0'', set <a
+ for=matrix>is 2D</a> to <code>false</code>.
 
  <p>The <dfn><code>m14</code></dfn> attribute, on getting, must return the <a for=matrix>m14
- element</a> value of the object it was invoked on. For the {{DOMMatrix}} interface, setting the
- {{DOMMatrix/m14}} attribute must set the <a for=matrix>m14 element</a> value of the object it was
- invoked on to the new value.
+ element</a> value. For the {{DOMMatrix}} interface, setting the {{DOMMatrix/m14}} attribute must
+ set the <a for=matrix>m14 element</a> to the new value and, if the new value is not ''0'', set <a
+ for=matrix>is 2D</a> to <code>false</code>.
 
  <p>The <dfn><code>m21</code></dfn> and <dfn><code>c</code></dfn> attributes, on getting, must
- return the <a for=matrix>m21 element</a> value of the object it was invoked on. For the
- {{DOMMatrix}} interface, setting the {{DOMMatrix/m21}} or the {{DOMMatrix/c}} attribute must set
- the <a for=matrix>m21 element</a> value of the object it was invoked on to the new value.
+ return the <a for=matrix>m21 element</a> value. For the {{DOMMatrix}} interface, setting the
+ {{DOMMatrix/m21}} or the {{DOMMatrix/c}} attribute must set the <a for=matrix>m21 element</a> to
+ the new value.
 
  <p>The <dfn><code>m22</code></dfn> and <dfn><code>d</code></dfn> attributes, on getting, must
- return the <a for=matrix>m22 element</a> value of the object it was invoked on. For the
- {{DOMMatrix}} interface, setting the {{DOMMatrix/m22}} or the {{DOMMatrix/d}} attribute must set
- the <a for=matrix>m22 element</a> value of the object it was invoked on to the new value.
+ return the <a for=matrix>m22 element</a> value. For the {{DOMMatrix}} interface, setting the
+ {{DOMMatrix/m22}} or the {{DOMMatrix/d}} attribute must set the <a for=matrix>m22 element</a> to
+ the new value.
 
  <p>The <dfn><code>m23</code></dfn> attribute, on getting, must return the <a for=matrix>m23
- element</a> value of the object it was invoked on. For the {{DOMMatrix}} interface, setting the
- {{DOMMatrix/m23}} attribute must set the <a for=matrix>m23 element</a> value of the object it was
- invoked on to the new value.
+ element</a> value. For the {{DOMMatrix}} interface, setting the {{DOMMatrix/m23}} attribute must
+ set the <a for=matrix>m23 element</a> to the new value and, if the new value is not ''0'', set <a
+ for=matrix>is 2D</a> to <code>false</code>.
 
  <p>The <dfn><code>m24</code></dfn> attribute, on getting, must return the <a for=matrix>m24
- element</a> value of the object it was invoked on. For the {{DOMMatrix}} interface, setting the
- {{DOMMatrix/m24}} attribute must set the <a for=matrix>m24 element</a> value of the object it was
- invoked on to the new value.
+ element</a> value. For the {{DOMMatrix}} interface, setting the {{DOMMatrix/m24}} attribute must
+ set the <a for=matrix>m24 element</a> to the new value and, if the new value is not ''0'', set <a
+ for=matrix>is 2D</a> to <code>false</code>.
 
  <p>The <dfn><code>m31</code></dfn> attribute, on getting, must return the <a for=matrix>m31
- element</a> value of the object it was invoked on. For the {{DOMMatrix}} interface, setting the
- {{DOMMatrix/m31}} attribute must set the <a for=matrix>m31 element</a> value of the object it was
- invoked on to the new value.
+ element</a> value. For the {{DOMMatrix}} interface, setting the {{DOMMatrix/m31}} attribute must
+ set the <a for=matrix>m31 element</a> to the new value and, if the new value is not ''0'', set <a
+ for=matrix>is 2D</a> to <code>false</code>.
 
  <p>The <dfn><code>m32</code></dfn> attribute, on getting, must return the <a for=matrix>m32
- element</a> value of the object it was invoked on. For the {{DOMMatrix}} interface, setting the
- {{DOMMatrix/m32}} attribute must set the <a for=matrix>m32 element</a> value of the object it was
- invoked on to the new value.
+ element</a> value. For the {{DOMMatrix}} interface, setting the {{DOMMatrix/m32}} attribute must
+ set the <a for=matrix>m32 element</a> to the new value and, if the new value is not ''0'', set <a
+ for=matrix>is 2D</a> to <code>false</code>.
 
  <p>The <dfn><code>m33</code></dfn> attribute, on getting, must return the <a for=matrix>m33
- element</a> value of the object it was invoked on. For the {{DOMMatrix}} interface, setting the
- {{DOMMatrix/m33}} attribute must set the <a for=matrix>m33 element</a> value of the object it was
- invoked on to the new value.
+ element</a> value. For the {{DOMMatrix}} interface, setting the {{DOMMatrix/m33}} attribute must
+ set the <a for=matrix>m33 element</a> to the new value and, if the new value is not ''1'', set <a
+ for=matrix>is 2D</a> to <code>false</code>.
 
  <p>The <dfn><code>m34</code></dfn> attribute, on getting, must return the <a for=matrix>m34
- element</a> value of the object it was invoked on. For the {{DOMMatrix}} interface, setting the
- {{DOMMatrix/m34}} attribute must set the <a for=matrix>m34 element</a> value of the object it was
- invoked on to the new value.
+ element</a> value. For the {{DOMMatrix}} interface, setting the {{DOMMatrix/m34}} attribute must
+ set the <a for=matrix>m34 element</a> to the new value and, if the new value is not ''0'', set <a
+ for=matrix>is 2D</a> to <code>false</code>.
 
  <p>The <dfn><code>m41</code></dfn> and <dfn><code>e</code></dfn> attributes, on getting, must
- return the <a for=matrix>m41 element</a> value of the object it was invoked on. For the
- {{DOMMatrix}} interface, setting the {{DOMMatrix/m41}} or the {{DOMMatrix/e}} attribute must set
- the <a for=matrix>m41 element</a> value of the object it was invoked on to the new value.
+ return the <a for=matrix>m41 element</a> value. For the {{DOMMatrix}} interface, setting the
+ {{DOMMatrix/m41}} or the {{DOMMatrix/e}} attribute must set the <a for=matrix>m41 element</a> to
+ the new value.
 
  <p>The <dfn><code>m42</code></dfn> and <dfn><code>f</code></dfn> attributes, on getting, must
- return the <a for=matrix>m42 element</a> value of the object it was invoked on. For the
- {{DOMMatrix}} interface, setting the {{DOMMatrix/m42}} or the {{DOMMatrix/f}} attribute must set
- the <a for=matrix>m42 element</a> value of the object it was invoked on to the new value.
+ return the <a for=matrix>m42 element</a> value. For the {{DOMMatrix}} interface, setting the
+ {{DOMMatrix/m42}} or the {{DOMMatrix/f}} attribute must set the <a for=matrix>m42 element</a> to
+ the new value.
 
  <p>The <dfn><code>m43</code></dfn> attribute, on getting, must return the <a for=matrix>m43
- element</a> value of the object it was invoked on. For the {{DOMMatrix}} interface, setting the
- {{DOMMatrix/m43}} attribute must set the <a for=matrix>m43 element</a> value of the object it was
- invoked on to the new value.
+ element</a> value. For the {{DOMMatrix}} interface, setting the {{DOMMatrix/m43}} attribute must
+ set the <a for=matrix>m43 element</a> to the new value and, if the new value is not ''0'', set <a
+ for=matrix>is 2D</a> to <code>false</code>.
 
  <p>The <dfn><code>m44</code></dfn> attribute, on getting, must return the <a for=matrix>m44
- element</a> value of the object it was invoked on. For the {{DOMMatrix}} interface, setting the
- {{DOMMatrix/m44}} attribute must set the <a for=matrix>m44 element</a> value of the object it was
- invoked on to the new value.
+ element</a> value. For the {{DOMMatrix}} interface, setting the {{DOMMatrix/m44}} attribute must
+ set the <a for=matrix>m44 element</a> to the new value and, if the new value is not ''1'', set <a
+ for=matrix>is 2D</a> to <code>false</code>.
 </div>
 
 <div class=note>