6 files changed, 6 insertions, 6 deletions
diff --git a/components/script/dom/audionode.rs b/components/script/dom/audionode.rs
index bdf864d0981..4a8ea032b45 100644
--- a/components/script/dom/audionode.rs
+++ b/components/script/dom/audionode.rs
@@ -258,7 +258,7 @@ impl AudioNodeMethods for AudioNode {
             EventTargetTypeId::AudioNode(AudioNodeTypeId::AudioDestinationNode) => {
                 if self.context.is_offline() {
                     return Err(Error::InvalidState);
-                } else if value < 1 || value > MAX_CHANNEL_COUNT {
+                } else if !(1..=MAX_CHANNEL_COUNT).contains(&value) {
                     return Err(Error::IndexSize);
                 }
             },
diff --git a/components/script/dom/bindings/utils.rs b/components/script/dom/bindings/utils.rs
index e5f5f8ab41f..64886971f5f 100644
--- a/components/script/dom/bindings/utils.rs
+++ b/components/script/dom/bindings/utils.rs
@@ -197,7 +197,7 @@ pub unsafe fn get_array_index_from_id(_cx: *mut JSContext, id: HandleId) -> Opti
     let first_char = char::decode_utf16(chars.iter().cloned())
         .next()
         .map_or('\0', |r| r.unwrap_or('\0'));
-    if !('a'..='z').contains(&first_char) {
+    if !first_char.is_ascii_lowercase() {
         return None;
     }
 
diff --git a/components/script/dom/blob.rs b/components/script/dom/blob.rs
index e1d38680d21..af45c1e858c 100644
--- a/components/script/dom/blob.rs
+++ b/components/script/dom/blob.rs
@@ -322,5 +322,5 @@ pub fn normalize_type_string(s: &str) -> String {
 fn is_ascii_printable(string: &str) -> bool {
     // Step 5.1 in Sec 5.1 of File API spec
     // <https://w3c.github.io/FileAPI/#constructorBlob>
-    string.chars().all(|c| c >= '\x20' && c <= '\x7E')
+    string.chars().all(|c| ('\x20'..='\x7E').contains(&c))
 }
diff --git a/components/script/dom/bluetoothuuid.rs b/components/script/dom/bluetoothuuid.rs
index c233b69144e..2be73830f3b 100644
--- a/components/script/dom/bluetoothuuid.rs
+++ b/components/script/dom/bluetoothuuid.rs
@@ -523,7 +523,7 @@ const BLUETOOTH_ASSIGNED_CHARCTERISTICS: &[(&str, u32)] = &[
 ];
 
 //https://developer.bluetooth.org/gatt/services/Pages/ServicesHome.aspx
-const BLUETOOTH_ASSIGNED_DESCRIPTORS: &'static [(&str, u32)] = &[
+const BLUETOOTH_ASSIGNED_DESCRIPTORS: &[(&str, u32)] = &[
     (
         "org.bluetooth.descriptor.gatt.characteristic_extended_properties",
         0x2900_u32,
diff --git a/components/script/dom/characterdata.rs b/components/script/dom/characterdata.rs
index 3c053281bea..5aeb344568d 100644
--- a/components/script/dom/characterdata.rs
+++ b/components/script/dom/characterdata.rs
@@ -148,7 +148,7 @@ impl CharacterDataMethods for CharacterData {
             Err(()) => substring += remaining,
             // Steps 4.
             Ok((s, astral, _)) => {
-                substring = substring + s;
+                substring += s;
                 // As if we had split the UTF-16 surrogate pair in half
                 // and then transcoded that to UTF-8 lossily,
                 // since our DOMString is currently strict UTF-8.
diff --git a/components/script/dom/cssnamespacerule.rs b/components/script/dom/cssnamespacerule.rs
index 3e6a1625136..0c51b43f387 100644
--- a/components/script/dom/cssnamespacerule.rs
+++ b/components/script/dom/cssnamespacerule.rs
@@ -57,7 +57,7 @@ impl CSSNamespaceRuleMethods for CSSNamespaceRule {
             .prefix
             .as_ref()
             .map(|s| s.to_string().into())
-            .unwrap_or(DOMString::new())
+            .unwrap_or_default()
     }
 
     // https://drafts.csswg.org/cssom/#dom-cssnamespacerule-namespaceuri