New page: DOMMatrixReadOnly.is2d

files/en-us/web/api/dommatrix/index.md

@@ -23,10 +23,6 @@ The interface is available inside [web workers](/en-US/docs/Web/API/Web_Workers_
 
 _This interface inherits properties from {{domxref("DOMMatrixReadOnly")}}, though some of these properties are altered to be mutable._
 
-- `is2D` {{ReadOnlyInline}}
-  - : A Boolean flag whose value is `true` if the matrix was initialized as a 2D matrix. If `false`, the matrix is 3D.
-- `isIdentity` {{ReadOnlyInline}}
-  - : A Boolean whose value is `true` if the matrix is the [identity matrix](https://en.wikipedia.org/wiki/Identity_matrix). The identity matrix is one in which every value is `0` _except_ those on the main diagonal from top-left to bottom-right corner (in other words, where the offsets in each direction are equal).
 - `m11`, `m12`, `m13`, `m14`, `m21`, `m22`, `m23`, `m24`, `m31`, `m32`, `m33`, `m34`, `m41`, `m42`, `m43`, `m44`
   - : Double-precision floating-point values representing each component of a 4×4 matrix, where `m11` through `m14` are the first column, `m21` through `m24` are the second column, and so forth.
 - `a`, `b`, `c`, `d`, `e`, `f`
@@ -106,4 +102,5 @@ The `DOMMatrix` interface is designed with the intent that it will be used for a
 
 ## See also
 
-- Its non-modifiable counterpart, {{domxref("DOMMatrixReadOnly")}}
+- {{domxref("DOMMatrixReadOnly.is2D")}}
+- {{domxref("DOMMatrixReadOnly.isIdentity")}}

files/en-us/web/api/dommatrixreadonly/index.md

@@ -20,10 +20,10 @@ This interface should be available inside [web workers](/en-US/docs/Web/API/Web_
 
 _This interface doesn't inherit any properties._
 
-- `is2D` {{ReadOnlyInline}}
+- {{domxref("DOMMatrixReadOnly.is2D")}} {{ReadOnlyInline}}
   - : A Boolean flag whose value is `true` if the matrix was initialized as a 2D matrix. If `false`, the matrix is 3D.
-- `isIdentity` {{ReadOnlyInline}}
-  - : A Boolean whose value is `true` if the matrix is the [identity matrix](https://en.wikipedia.org/wiki/Identity_matrix). The identity matrix is one in which every value is `0` _except_ those on the main diagonal from top-left to bottom-right corner (in other words, where the offsets in each direction are equal).
+- {{domxref("DOMMatrixReadOnly.isIdentity")}} {{ReadOnlyInline}}
+  - : A Boolean whose value is `true` if the matrix is an [identity matrix](https://en.wikipedia.org/wiki/Identity_matrix).
 - `m11`, `m12`, `m13`, `m14`, `m21`, `m22`, `m23`, `m24`, `m31`, `m32`, `m33`, `m34`, `m41`, `m42`, `m43`, `m44`
   - : Double-precision floating-point values representing each component of a 4×4 matrix, where `m11` through `m14` are the first column, `m21` through `m24` are the second column, and so forth.
 - `a`, `b`, `c`, `d`, `e`, `f`

files/en-us/web/api/dommatrixreadonly/is2d/index.md

@@ -0,0 +1,47 @@
+---
+title: "DOMMatrixReadOnly: is2D property"
+short-title: is2D
+slug: Web/API/DOMMatrixReadOnly/is2D
+page-type: web-api-instance-method
+browser-compat: api.DOMMatrixReadOnly.is2D
+---
+
+{{APIRef("Geometry Interfaces")}}{{AvailableInWorkers}}
+
+The readonly **`is2D`** property of the {{domxref("DOMMatrixReadOnly")}} interface is a Boolean flag that is `true` when the matrix is 2D. The value is `true` if the matrix was initialized as a 2D matrix and only 2D transformation operations were applied. Otherwise, the matrix is defined in 3D, and `is2D` is `false`.
+
+## Value
+
+A Boolean value.
+
+## Examples
+
+```js
+// Initialize a 2D matrix
+const matrix = new DOMMatrix(); // create a matrix
+console.log(matrix.is2D); // output: true
+
+// Transform in a 2D space
+console.log(matrix.rotate(30).is2D); // output: true
+
+// Apply a 3D transform
+console.log(matrix.rotate(10, 20, 1).is2D); // output: false
+```
+
+## Specifications
+
+{{Specifications}}
+
+## Browser compatibility
+
+{{Compat}}
+
+## See also
+
+- {{domxref("CSSTransformValue.is2D")}}
+- {{domxref("CSSTransformComponent.is2D")}}
+- CSS {{cssxref("transform-function")}} functions
+- CSS {{cssxref("transform")}} property
+- [CSS transforms](/en-US/docs/Web/CSS/CSS_transforms) module
+- SVG [`transform`](/en-US/docs/Web/SVG/Attribute/transform) attribute
+- {{domxref("CanvasRenderingContext2D")}} interface

files/en-us/web/api/dommatrixreadonly/isidentity/index.md

@@ -0,0 +1,49 @@
+---
+title: "DOMMatrixReadOnly: isIdentity property"
+short-title: isIdentity
+slug: Web/API/DOMMatrixReadOnly/isIdentity
+page-type: web-api-instance-method
+browser-compat: api.DOMMatrixReadOnly.isIdentity
+---
+
+{{APIRef("Geometry Interfaces")}}{{AvailableInWorkers}}
+
+The readonly **`isIdentity`** property of the {{domxref("DOMMatrixReadOnly")}} interface is a Boolean whose value is `true` if the matrix is the [identity matrix](https://en.wikipedia.org/wiki/Identity_matrix).
+
+The identity matrix is one in which every value is `0` _except_ those on the main diagonal from top-left to bottom-right corner (in other words, where the offsets in each direction are equal).
+
+## Value
+
+A Boolean value.
+
+## Examples
+
+```js
+// Initialize a 2D matrix
+const matrix = new DOMMatrix(); // create a matrix
+console.log(matrix.isIdentity); // output: true
+
+// Apply a transform that has no effect
+console.log(matrix.translate(0).isIdentity); // output: true
+
+// Apply a transform with effect: this rotates the matrix by 30deg
+console.log(matrix.rotate(30).isIdentity); // output: false
+```
+
+## Specifications
+
+{{Specifications}}
+
+## Browser compatibility
+
+{{Compat}}
+
+## See also
+
+- {{domxref("DOMMatrix")}} interface
+- {{domxref("CSSMatrixComponent")}} interface
+- {{domxref("CanvasRenderingContext2D")}} interface
+- CSS {{cssxref("transform-function/matrix()")}} function
+- CSS {{cssxref("transform")}} property
+- [CSS transforms](/en-US/docs/Web/CSS/CSS_transforms) module
+- SVG [`transform`](/en-US/docs/Web/SVG/Attribute/transform) attribute