Add a group for CSS transforms (#1112)

Author: foolip

features/individual-transforms.dist.yml

@@ -4,6 +4,7 @@
 name: Individual transform properties
 description: Transform elements with separate `translate`, `rotate`, and `scale` CSS properties.
 spec: https://drafts.csswg.org/css-transforms-2/#individual-transforms
+group: transforms
 usage_stats:
   - https://chromestatus.com/metrics/css/timeline/popularity/504 # translate
   - https://chromestatus.com/metrics/css/timeline/popularity/505 # rotate

features/individual-transforms.yml

@@ -1,6 +1,7 @@
 name: Individual transform properties
 description: Transform elements with separate `translate`, `rotate`, and `scale` CSS properties.
 spec: https://drafts.csswg.org/css-transforms-2/#individual-transforms
+group: transforms
 usage_stats:
   - https://chromestatus.com/metrics/css/timeline/popularity/504 # translate
   - https://chromestatus.com/metrics/css/timeline/popularity/505 # rotate

features/transforms2d.dist.yml

@@ -5,6 +5,7 @@ name: 2D transforms
 description: The `transform` CSS property and its 2D transform functions allow rotating, scaling, skewing, and translating an element. Arbitrary 2D transforms are also possible using a transformation matrix.
 caniuse: transforms2d
 spec: https://drafts.csswg.org/css-transforms-1/
+group: transforms
 status:
   baseline: high
   baseline_low_date: 2015-09-30

features/transforms2d.yml

@@ -2,3 +2,4 @@ name: 2D transforms
 description: The `transform` CSS property and its 2D transform functions allow rotating, scaling, skewing, and translating an element. Arbitrary 2D transforms are also possible using a transformation matrix.
 caniuse: transforms2d
 spec: https://drafts.csswg.org/css-transforms-1/
+group: transforms

features/transforms3d.dist.yml

@@ -5,6 +5,7 @@ name: 3D transforms
 description: The `transform` CSS property and its 3D transform functions allow rotations and other transforms in three dimensions, including perspective transforms.
 caniuse: transforms3d
 spec: https://drafts.csswg.org/css-transforms-2/
+group: transforms
 status:
   baseline: low
   baseline_low_date: 2022-03-14

features/transforms3d.yml

@@ -2,3 +2,4 @@ name: 3D transforms
 description: The `transform` CSS property and its 3D transform functions allow rotations and other transforms in three dimensions, including perspective transforms.
 caniuse: transforms3d
 spec: https://drafts.csswg.org/css-transforms-2/
+group: transforms

groups/transforms.yml

@@ -0,0 +1,3 @@
+# https://drafts.csswg.org/css-transforms/ (any level)
+name: Transforms
+parent: css