diff --git a/features/ch.yml b/features/ch.yml
new file mode 100644
index 00000000000..ea127306a94
--- /dev/null
+++ b/features/ch.yml
@@ -0,0 +1,6 @@
+name: ch unit
+description: The `ch` CSS length unit is a font-relative length based on the width of the zero (0) character.
+spec: https://drafts.csswg.org/css-values-4/#font-relative-lengths
+group: units
+compat_features:
+  - css.types.length.ch
diff --git a/features/ch.yml.dist b/features/ch.yml.dist
new file mode 100644
index 00000000000..bf67bf1e362
--- /dev/null
+++ b/features/ch.yml.dist
@@ -0,0 +1,17 @@
+# Generated from: ch.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "27"
+    chrome_android: "27"
+    edge: "12"
+    firefox: "1"
+    firefox_android: "4"
+    safari: "7"
+    safari_ios: "7"
+compat_features:
+  - css.types.length.ch
diff --git a/features/em-unit.yml b/features/em-unit.yml
new file mode 100644
index 00000000000..1451862f8a1
--- /dev/null
+++ b/features/em-unit.yml
@@ -0,0 +1,6 @@
+name: em unit
+description: The `em` CSS length unit is a font-relative length equal to the specified font size. In an element with a 2 inch font, `1em` equals 2 inches.
+spec: https://drafts.csswg.org/css-values-4/#font-relative-lengths
+group: units
+compat_features:
+  - css.types.length.em
diff --git a/features/em-unit.yml.dist b/features/em-unit.yml.dist
new file mode 100644
index 00000000000..03636576eaa
--- /dev/null
+++ b/features/em-unit.yml.dist
@@ -0,0 +1,17 @@
+# Generated from: em-unit.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "1"
+    chrome_android: "18"
+    edge: "12"
+    firefox: "1"
+    firefox_android: "4"
+    safari: "1"
+    safari_ios: "1"
+compat_features:
+  - css.types.length.em
diff --git a/features/ex.yml b/features/ex.yml
new file mode 100644
index 00000000000..ebcea9ce089
--- /dev/null
+++ b/features/ex.yml
@@ -0,0 +1,6 @@
+name: ex unit
+description: The `ex` CSS length unit is a font-relative length equal to the used x-height of the first available font. X-height is often equal to the height of the lowercase x.
+spec: https://drafts.csswg.org/css-values-4/#font-relative-lengths
+group: units
+compat_features:
+  - css.types.length.ex
diff --git a/features/ex.yml.dist b/features/ex.yml.dist
new file mode 100644
index 00000000000..8aaddf19ed1
--- /dev/null
+++ b/features/ex.yml.dist
@@ -0,0 +1,17 @@
+# Generated from: ex.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "1"
+    chrome_android: "18"
+    edge: "12"
+    firefox: "1"
+    firefox_android: "4"
+    safari: "1"
+    safari_ios: "1"
+compat_features:
+  - css.types.length.ex
diff --git a/features/q-unit.yml b/features/q-unit.yml
new file mode 100644
index 00000000000..0ede2985288
--- /dev/null
+++ b/features/q-unit.yml
@@ -0,0 +1,6 @@
+name: Q unit
+description: The `Q` CSS length unit is an absolute length anchored to the physical measurement of quarter-millimeters. `1Q` is equivalent to 1/40 of 1 centimeter.
+spec: https://drafts.csswg.org/css-values-4/#absolute-lengths
+group: units
+compat_features:
+  - css.types.length.Q
diff --git a/features/q-unit.yml.dist b/features/q-unit.yml.dist
new file mode 100644
index 00000000000..7a5ac846220
--- /dev/null
+++ b/features/q-unit.yml.dist
@@ -0,0 +1,17 @@
+# Generated from: q-unit.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2020-03-24
+  baseline_high_date: 2022-09-24
+  support:
+    chrome: "63"
+    chrome_android: "63"
+    edge: "79"
+    firefox: "49"
+    firefox_android: "49"
+    safari: "13.1"
+    safari_ios: "13.4"
+compat_features:
+  - css.types.length.Q
diff --git a/features/rcap.yml b/features/rcap.yml
new file mode 100644
index 00000000000..110bf559fd4
--- /dev/null
+++ b/features/rcap.yml
@@ -0,0 +1,6 @@
+name: rcap unit
+description: The `rcap` CSS length unit is a font-relative length equal to the value of the `cap` unit on the root element. Cap-height is approximately equal to the height of a capital Latin letter.
+spec: https://drafts.csswg.org/css-values-4/#font-relative-lengths
+group: units
+compat_features:
+  - css.types.length.rcap
diff --git a/features/rcap.yml.dist b/features/rcap.yml.dist
new file mode 100644
index 00000000000..21769eb9b52
--- /dev/null
+++ b/features/rcap.yml.dist
@@ -0,0 +1,13 @@
+# Generated from: rcap.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support:
+    chrome: "118"
+    chrome_android: "118"
+    edge: "118"
+    safari: "17.2"
+    safari_ios: "17.2"
+compat_features:
+  - css.types.length.rcap
diff --git a/features/rch.yml b/features/rch.yml
new file mode 100644
index 00000000000..b7f4432fbe5
--- /dev/null
+++ b/features/rch.yml
@@ -0,0 +1,6 @@
+name: rch unit
+description: The `rch` CSS length unit is a font-relative length equal to the value of the `ch` unit on the root element. `ch` length is based on the width of the zero (0) character.
+spec: https://drafts.csswg.org/css-values-4/#font-relative-lengths
+group: units
+compat_features:
+  - css.types.length.rch
diff --git a/features/rch.yml.dist b/features/rch.yml.dist
new file mode 100644
index 00000000000..f8a0ee27847
--- /dev/null
+++ b/features/rch.yml.dist
@@ -0,0 +1,13 @@
+# Generated from: rch.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support:
+    chrome: "111"
+    chrome_android: "111"
+    edge: "111"
+    safari: "17.2"
+    safari_ios: "17.2"
+compat_features:
+  - css.types.length.rch
diff --git a/features/rem.yml b/features/rem.yml
new file mode 100644
index 00000000000..a44519381e8
--- /dev/null
+++ b/features/rem.yml
@@ -0,0 +1,7 @@
+name: rem
+description: The `rem` CSS length unit is a font-relative length that is equal to the font size of the root HTML element which for most browsers is `16px`.
+spec: https://drafts.csswg.org/css-values-4/#font-relative-lengths
+caniuse: rem
+group: units
+compat_features:
+  - css.types.length.rem
diff --git a/features/rem.yml.dist b/features/rem.yml.dist
new file mode 100644
index 00000000000..1c847be7256
--- /dev/null
+++ b/features/rem.yml.dist
@@ -0,0 +1,17 @@
+# Generated from: rem.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "4"
+    chrome_android: "18"
+    edge: "12"
+    firefox: "3.6"
+    firefox_android: "4"
+    safari: "5"
+    safari_ios: "4"
+compat_features:
+  - css.types.length.rem
diff --git a/features/rex.yml b/features/rex.yml
new file mode 100644
index 00000000000..864a1cc3b4e
--- /dev/null
+++ b/features/rex.yml
@@ -0,0 +1,6 @@
+name: rex unit
+description: The `rex` CSS length unit is a font-relative length that is equal to the x-height of the root element.
+spec: https://drafts.csswg.org/css-values-4/#font-relative-lengths
+group: units
+compat_features:
+  - css.types.length.rex
diff --git a/features/rex.yml.dist b/features/rex.yml.dist
new file mode 100644
index 00000000000..6b1c61f421c
--- /dev/null
+++ b/features/rex.yml.dist
@@ -0,0 +1,13 @@
+# Generated from: rex.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support:
+    chrome: "111"
+    chrome_android: "111"
+    edge: "111"
+    safari: "17.2"
+    safari_ios: "17.2"
+compat_features:
+  - css.types.length.rex
diff --git a/features/ric.yml b/features/ric.yml
new file mode 100644
index 00000000000..2ad88959b12
--- /dev/null
+++ b/features/ric.yml
@@ -0,0 +1,6 @@
+name: ric unit
+description: The `ric` CSS length unit, or root international character, is a font-relative length equal to the width of CJK character relative to the root element.
+spec: https://drafts.csswg.org/css-values-4/#font-relative-lengths
+group: units
+compat_features:
+  - css.types.length.ric
diff --git a/features/ric.yml.dist b/features/ric.yml.dist
new file mode 100644
index 00000000000..a696528ce1d
--- /dev/null
+++ b/features/ric.yml.dist
@@ -0,0 +1,13 @@
+# Generated from: ric.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support:
+    chrome: "111"
+    chrome_android: "111"
+    edge: "111"
+    safari: "17.2"
+    safari_ios: "17.2"
+compat_features:
+  - css.types.length.ric
diff --git a/features/rlh.yml b/features/rlh.yml
new file mode 100644
index 00000000000..302c01e0478
--- /dev/null
+++ b/features/rlh.yml
@@ -0,0 +1,6 @@
+name: rlh unit
+description: The `rlh` CSS length unit is a font-relative length relative to the line height of root element.
+spec: https://drafts.csswg.org/css-values-4/#font-relative-lengths
+group: units
+compat_features:
+  - css.types.length.rlh
diff --git a/features/rlh.yml.dist b/features/rlh.yml.dist
new file mode 100644
index 00000000000..33a2dc631c0
--- /dev/null
+++ b/features/rlh.yml.dist
@@ -0,0 +1,16 @@
+# Generated from: rlh.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: low
+  baseline_low_date: 2023-11-21
+  support:
+    chrome: "111"
+    chrome_android: "111"
+    edge: "111"
+    firefox: "120"
+    firefox_android: "120"
+    safari: "16.4"
+    safari_ios: "16.4"
+compat_features:
+  - css.types.length.rlh