diff --git a/Cargo.lock b/Cargo.lock
index 0f5c5e5347f..7d2d4d30284 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1598,6 +1598,26 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "derive_more"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "093242cf7570c207c83073cf82f79706fe7b8317e98620a47d5be7c3d8497678"
+dependencies = [
+ "derive_more-impl",
+]
+
+[[package]]
+name = "derive_more-impl"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bda628edc44c4bb645fbe0f758797143e4e07926f7ebf4e9bdfbd3d2ce621df3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "devtools"
 version = "0.0.1"
@@ -6787,12 +6807,12 @@ dependencies = [
 
 [[package]]
 name = "selectors"
-version = "0.28.0"
-source = "git+https://github.com/servo/stylo?branch=2025-05-01#3a3663a3199282cb06889e48a427db76f320ddc3"
+version = "0.29.0"
+source = "git+https://github.com/servo/stylo?branch=2025-06-03#2e1f66b06836428e4b29dd8144c72432c97ff316"
 dependencies = [
  "bitflags 2.9.1",
  "cssparser",
- "derive_more",
+ "derive_more 2.0.1",
  "fxhash",
  "log",
  "new_debug_unreachable",
@@ -7083,7 +7103,7 @@ dependencies = [
 [[package]]
 name = "servo_arc"
 version = "0.4.1"
-source = "git+https://github.com/servo/stylo?branch=2025-05-01#3a3663a3199282cb06889e48a427db76f320ddc3"
+source = "git+https://github.com/servo/stylo?branch=2025-06-03#2e1f66b06836428e4b29dd8144c72432c97ff316"
 dependencies = [
  "serde",
  "stable_deref_trait",
@@ -7547,8 +7567,8 @@ dependencies = [
 
 [[package]]
 name = "stylo"
-version = "0.3.0"
-source = "git+https://github.com/servo/stylo?branch=2025-05-01#3a3663a3199282cb06889e48a427db76f320ddc3"
+version = "0.4.0"
+source = "git+https://github.com/servo/stylo?branch=2025-06-03#2e1f66b06836428e4b29dd8144c72432c97ff316"
 dependencies = [
  "app_units",
  "arrayvec",
@@ -7556,7 +7576,7 @@ dependencies = [
  "bitflags 2.9.1",
  "byteorder",
  "cssparser",
- "derive_more",
+ "derive_more 2.0.1",
  "encoding_rs",
  "euclid",
  "fxhash",
@@ -7604,8 +7624,8 @@ dependencies = [
 
 [[package]]
 name = "stylo_atoms"
-version = "0.3.0"
-source = "git+https://github.com/servo/stylo?branch=2025-05-01#3a3663a3199282cb06889e48a427db76f320ddc3"
+version = "0.4.0"
+source = "git+https://github.com/servo/stylo?branch=2025-06-03#2e1f66b06836428e4b29dd8144c72432c97ff316"
 dependencies = [
  "string_cache",
  "string_cache_codegen",
@@ -7613,13 +7633,13 @@ dependencies = [
 
 [[package]]
 name = "stylo_config"
-version = "0.3.0"
-source = "git+https://github.com/servo/stylo?branch=2025-05-01#3a3663a3199282cb06889e48a427db76f320ddc3"
+version = "0.4.0"
+source = "git+https://github.com/servo/stylo?branch=2025-06-03#2e1f66b06836428e4b29dd8144c72432c97ff316"
 
 [[package]]
 name = "stylo_derive"
-version = "0.3.0"
-source = "git+https://github.com/servo/stylo?branch=2025-05-01#3a3663a3199282cb06889e48a427db76f320ddc3"
+version = "0.4.0"
+source = "git+https://github.com/servo/stylo?branch=2025-06-03#2e1f66b06836428e4b29dd8144c72432c97ff316"
 dependencies = [
  "darling",
  "proc-macro2",
@@ -7630,8 +7650,8 @@ dependencies = [
 
 [[package]]
 name = "stylo_dom"
-version = "0.3.0"
-source = "git+https://github.com/servo/stylo?branch=2025-05-01#3a3663a3199282cb06889e48a427db76f320ddc3"
+version = "0.4.0"
+source = "git+https://github.com/servo/stylo?branch=2025-06-03#2e1f66b06836428e4b29dd8144c72432c97ff316"
 dependencies = [
  "bitflags 2.9.1",
  "stylo_malloc_size_of",
@@ -7639,8 +7659,8 @@ dependencies = [
 
 [[package]]
 name = "stylo_malloc_size_of"
-version = "0.3.0"
-source = "git+https://github.com/servo/stylo?branch=2025-05-01#3a3663a3199282cb06889e48a427db76f320ddc3"
+version = "0.4.0"
+source = "git+https://github.com/servo/stylo?branch=2025-06-03#2e1f66b06836428e4b29dd8144c72432c97ff316"
 dependencies = [
  "app_units",
  "cssparser",
@@ -7656,13 +7676,13 @@ dependencies = [
 
 [[package]]
 name = "stylo_static_prefs"
-version = "0.3.0"
-source = "git+https://github.com/servo/stylo?branch=2025-05-01#3a3663a3199282cb06889e48a427db76f320ddc3"
+version = "0.4.0"
+source = "git+https://github.com/servo/stylo?branch=2025-06-03#2e1f66b06836428e4b29dd8144c72432c97ff316"
 
 [[package]]
 name = "stylo_traits"
-version = "0.3.0"
-source = "git+https://github.com/servo/stylo?branch=2025-05-01#3a3663a3199282cb06889e48a427db76f320ddc3"
+version = "0.4.0"
+source = "git+https://github.com/servo/stylo?branch=2025-06-03#2e1f66b06836428e4b29dd8144c72432c97ff316"
 dependencies = [
  "app_units",
  "bitflags 2.9.1",
@@ -8079,7 +8099,7 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 [[package]]
 name = "to_shmem"
 version = "0.2.0"
-source = "git+https://github.com/servo/stylo?branch=2025-05-01#3a3663a3199282cb06889e48a427db76f320ddc3"
+source = "git+https://github.com/servo/stylo?branch=2025-06-03#2e1f66b06836428e4b29dd8144c72432c97ff316"
 dependencies = [
  "cssparser",
  "servo_arc",
@@ -8092,7 +8112,7 @@ dependencies = [
 [[package]]
 name = "to_shmem_derive"
 version = "0.1.0"
-source = "git+https://github.com/servo/stylo?branch=2025-05-01#3a3663a3199282cb06889e48a427db76f320ddc3"
+source = "git+https://github.com/servo/stylo?branch=2025-06-03#2e1f66b06836428e4b29dd8144c72432c97ff316"
 dependencies = [
  "darling",
  "proc-macro2",
@@ -9038,7 +9058,7 @@ dependencies = [
  "bitflags 2.9.1",
  "build-parallel",
  "byteorder",
- "derive_more",
+ "derive_more 0.99.20",
  "etagere",
  "euclid",
  "fxhash",
diff --git a/Cargo.toml b/Cargo.toml
index 2f034745fb5..edfce3d48be 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -120,7 +120,7 @@ rustls-pemfile = "2.0"
 rustls-pki-types = "1.12"
 script_layout_interface = { path = "components/shared/script_layout" }
 script_traits = { path = "components/shared/script" }
-selectors = { git = "https://github.com/servo/stylo", branch = "2025-05-01" }
+selectors = { git = "https://github.com/servo/stylo", branch = "2025-06-03" }
 serde = "1.0.219"
 serde_bytes = "0.11"
 serde_json = "1.0"
@@ -128,7 +128,7 @@ servo-media = { git = "https://github.com/servo/media" }
 servo-media-dummy = { git = "https://github.com/servo/media" }
 servo-media-gstreamer = { git = "https://github.com/servo/media" }
 servo-tracing = { path = "components/servo_tracing" }
-servo_arc = { git = "https://github.com/servo/stylo", branch = "2025-05-01" }
+servo_arc = { git = "https://github.com/servo/stylo", branch = "2025-06-03" }
 smallbitvec = "2.6.0"
 smallvec = "1.15"
 snapshot = { path = "./components/shared/snapshot" }
@@ -137,12 +137,12 @@ string_cache = "0.8"
 string_cache_codegen = "0.5"
 strum = "0.26"
 strum_macros = "0.26"
-stylo = { git = "https://github.com/servo/stylo", branch = "2025-05-01" }
-stylo_atoms = { git = "https://github.com/servo/stylo", branch = "2025-05-01" }
-stylo_config = { git = "https://github.com/servo/stylo", branch = "2025-05-01" }
-stylo_dom = { git = "https://github.com/servo/stylo", branch = "2025-05-01" }
-stylo_malloc_size_of = { git = "https://github.com/servo/stylo", branch = "2025-05-01" }
-stylo_traits = { git = "https://github.com/servo/stylo", branch = "2025-05-01" }
+stylo = { git = "https://github.com/servo/stylo", branch = "2025-06-03" }
+stylo_atoms = { git = "https://github.com/servo/stylo", branch = "2025-06-03" }
+stylo_config = { git = "https://github.com/servo/stylo", branch = "2025-06-03" }
+stylo_dom = { git = "https://github.com/servo/stylo", branch = "2025-06-03" }
+stylo_malloc_size_of = { git = "https://github.com/servo/stylo", branch = "2025-06-03" }
+stylo_traits = { git = "https://github.com/servo/stylo", branch = "2025-06-03" }
 surfman = { git = "https://github.com/servo/surfman", rev = "f7688b4585f9e0b5d4bf8ee8e4a91e82349610b1", features = ["chains"] }
 syn = { version = "2", default-features = false, features = ["clone-impls", "derive", "parsing"] }
 synstructure = "0.13"
diff --git a/components/layout/context.rs b/components/layout/context.rs
index 1ee76606b0b..5360c24ae9f 100644
--- a/components/layout/context.rs
+++ b/components/layout/context.rs
@@ -311,6 +311,7 @@ impl LayoutContext<'_> {
                             })
                     })
             },
+            Image::LightDark(..) => unreachable!("light-dark() should be disabled"),
         }
     }
 }
diff --git a/components/layout/lists.rs b/components/layout/lists.rs
index 8c653cb6858..730735b86e1 100644
--- a/components/layout/lists.rs
+++ b/components/layout/lists.rs
@@ -35,6 +35,7 @@ pub(crate) fn make_marker<'dom>(
         Image::CrossFade(..) |
         Image::PaintWorklet(..) |
         Image::None => None,
+        Image::LightDark(..) => unreachable!("light-dark() should be disabled"),
     };
     let content = marker_image().or_else(|| {
         Some(vec![PseudoElementContentItem::Text(
diff --git a/deny.toml b/deny.toml
index 037e09e8469..123a14d9a7d 100644
--- a/deny.toml
+++ b/deny.toml
@@ -171,6 +171,9 @@ skip = [
     "rand_core",
     "wasi",
     "webpki-roots",
+
+    # Stylo uses 2.0, WebRender uses 0.99
+    "derive_more",
 ]
 
 # github.com organizations to allow git sources for
diff --git a/tests/wpt/meta/css/css-color/light-dark-currentcolor-in-color.html.ini b/tests/wpt/meta/css/css-color/light-dark-currentcolor-in-color.html.ini
new file mode 100644
index 00000000000..abecbdd3ba8
--- /dev/null
+++ b/tests/wpt/meta/css/css-color/light-dark-currentcolor-in-color.html.ini
@@ -0,0 +1,3 @@
+[light-dark-currentcolor-in-color.html]
+  [curentColor in light-dark() refers to parent color]
+    expected: FAIL
diff --git a/tests/wpt/meta/css/css-color/light-dark-currentcolor.html.ini b/tests/wpt/meta/css/css-color/light-dark-currentcolor.html.ini
deleted file mode 100644
index 669af6d8ea5..00000000000
--- a/tests/wpt/meta/css/css-color/light-dark-currentcolor.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[light-dark-currentcolor.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-color/light-dark-inheritance.html.ini b/tests/wpt/meta/css/css-color/light-dark-inheritance.html.ini
deleted file mode 100644
index bf8493daf3a..00000000000
--- a/tests/wpt/meta/css/css-color/light-dark-inheritance.html.ini
+++ /dev/null
@@ -1,2 +0,0 @@
-[light-dark-inheritance.html]
-  expected: FAIL
diff --git a/tests/wpt/meta/css/css-color/parsing/color-computed-relative-color.html.ini b/tests/wpt/meta/css/css-color/parsing/color-computed-relative-color.html.ini
index 9a7822335e1..02097868834 100644
--- a/tests/wpt/meta/css/css-color/parsing/color-computed-relative-color.html.ini
+++ b/tests/wpt/meta/css/css-color/parsing/color-computed-relative-color.html.ini
@@ -497,11 +497,5 @@
   [Property color value 'color(from hwb(from color(xyz-d65 0.99 0.88 0.77) h w b) xyz-d65 x y z)']
     expected: FAIL
 
-  [Property color value 'light-dark(rgb(from rebeccapurple r g b), rgb(from rebeccapurple r g b))']
-    expected: FAIL
-
-  [Property color value 'light-dark(color-mix(in srgb, rgb(from rebeccapurple none g b), rebeccapurple), color-mix(in srgb, rgb(from rebeccapurple none g b), rebeccapurple))']
-    expected: FAIL
-
   [Property color value 'LCH(from var(--accent) l c calc(h + 180 * sibling-index()))']
     expected: FAIL
diff --git a/tests/wpt/meta/css/css-easing/timing-functions-syntax-valid.html.ini b/tests/wpt/meta/css/css-easing/timing-functions-syntax-valid.html.ini
index 4620f3f5070..46064a3d393 100644
--- a/tests/wpt/meta/css/css-easing/timing-functions-syntax-valid.html.ini
+++ b/tests/wpt/meta/css/css-easing/timing-functions-syntax-valid.html.ini
@@ -20,9 +20,6 @@
   [e.style['animation-timing-function'\] = "steps(calc(-10), start)" should set the property value]
     expected: FAIL
 
-  [e.style['animation-timing-function'\] = "steps(calc(5 / 2), start)" should set the property value]
-    expected: FAIL
-
   [e.style['animation-timing-function'\] = "steps(calc(1), jump-none)" should set the property value]
     expected: FAIL
 
diff --git a/tests/wpt/meta/css/css-nesting/nested-declarations-cssom-whitespace.html.ini b/tests/wpt/meta/css/css-nesting/nested-declarations-cssom-whitespace.html.ini
deleted file mode 100644
index 49fac78706d..00000000000
--- a/tests/wpt/meta/css/css-nesting/nested-declarations-cssom-whitespace.html.ini
+++ /dev/null
@@ -1,6 +0,0 @@
-[nested-declarations-cssom-whitespace.html]
-  [Empty CSSNestedDeclarations do not affect outer serialization]
-    expected: FAIL
-
-  [Empty CSSNestedDeclarations do not affect outer serialization (nested grouping rule)]
-    expected: FAIL
diff --git a/tests/wpt/meta/css/css-values/attr-all-types.html.ini b/tests/wpt/meta/css/css-values/attr-all-types.html.ini
index 769d98fcfc1..0b39fc70aac 100644
--- a/tests/wpt/meta/css/css-values/attr-all-types.html.ini
+++ b/tests/wpt/meta/css/css-values/attr-all-types.html.ini
@@ -41,6 +41,9 @@
   [CSS Values and Units Test: attr 17]
     expected: FAIL
 
+  [CSS Values and Units Test: attr 20]
+    expected: FAIL
+
   [CSS Values and Units Test: attr 24]
     expected: FAIL
 
diff --git a/tests/wpt/meta/css/css-values/rlh-on-root-lengths.html.ini b/tests/wpt/meta/css/css-values/rlh-on-root-lengths.html.ini
deleted file mode 100644
index 101215d83d6..00000000000
--- a/tests/wpt/meta/css/css-values/rlh-on-root-lengths.html.ini
+++ /dev/null
@@ -1,3 +0,0 @@
-[rlh-on-root-lengths.html]
-  [Non font or line-height properties on :root should resolve rlh against :root line-height]
-    expected: FAIL