diff --git a/crates/ui-egui/src/shortcuts.rs b/crates/ui-egui/src/shortcuts.rs
index 2326b247..15141c85 100644
--- a/crates/ui-egui/src/shortcuts.rs
+++ b/crates/ui-egui/src/shortcuts.rs
@@ -41,14 +41,11 @@ pub fn parse(s: &str) -> Option<(Modifiers, Key)> {
     key.map(|k| (m, k))
 }
 
-/// Cmd and Ctrl are separate keys only on macOS.
-const MAC: bool = cfg!(target_os = "macos");
-
 /// Whether the held modifiers `got` fire a shortcut that asks for `want`.
 fn mods_match(want: Modifiers, got: Modifiers, mac: bool) -> bool {
     // Off macOS egui reports Ctrl as both `ctrl` and `command`: Ctrl is the shortcut's Cmd, and a shortcut's
     // Ctrl (the Mac Control key) has no key of its own there, so Ctrl+X is Cut, not Cmd+Ctrl+X.
-    let ctrl = if mac { want.ctrl == got.ctrl || got.mac_cmd } else { !want.ctrl };
+    let ctrl = if mac { want.ctrl == got.ctrl } else { !want.ctrl };
     want.command == got.command && want.shift == got.shift && want.alt == got.alt && ctrl
 }
 
@@ -70,12 +67,14 @@ pub fn handle(app: &mut SoundApp, ctx: &egui::Context) {
             })
             .collect()
     });
+    // Cmd and Ctrl are separate keys only on macOS (asked at runtime so the web build in a Mac browser agrees).
+    let mac = ctx.os() == egui::os::OperatingSystem::Mac;
     for (key, mods) in events {
-        if fixed(app, key, mods) {
+        if fixed(app, key, mods, mac) {
             continue;
         }
         let hit =
-            soundcraft_engine::command_specs().iter().find(|c| c.shortcut.and_then(parse).is_some_and(|(m, k)| k == key && mods_match(m, mods, MAC)));
+            soundcraft_engine::command_specs().iter().find(|c| c.shortcut.and_then(parse).is_some_and(|(m, k)| k == key && mods_match(m, mods, mac)));
         if let Some(c) = hit {
             let id = c.id;
             if crate::menus::invoke_shortcut_dialog(app, id) {
@@ -87,7 +86,7 @@ pub fn handle(app: &mut SoundApp, ctx: &egui::Context) {
 }
 
 /// Keys with context-dependent meaning. Returns true when handled.
-fn fixed(app: &mut SoundApp, key: Key, m: Modifiers) -> bool {
+fn fixed(app: &mut SoundApp, key: Key, m: Modifiers, mac: bool) -> bool {
     let plain = !m.command && !m.alt && !m.ctrl && !m.shift;
     match key {
         Key::Space if !m.command && !m.alt => {
@@ -99,7 +98,7 @@ fn fixed(app: &mut SoundApp, key: Key, m: Modifiers) -> bool {
             let _ = app.run("transport.record", json!({}));
             true
         }
-        Key::S if search_chord(m, MAC) => {
+        Key::S if search_chord(m, mac) => {
             let _ = app.run("window.search", json!({}));
             true
         }
@@ -269,6 +268,7 @@ mod tests {
         assert!(mods_match(want("Cmd+S"), MAC_CMD, true));
         assert!(!mods_match(want("Cmd+S"), Modifiers::CTRL, true));
         assert!(mods_match(want("Cmd+Ctrl+X"), Modifiers { ctrl: true, ..MAC_CMD }, true));
+        assert!(!mods_match(want("Cmd+X"), Modifiers { ctrl: true, ..MAC_CMD }, true), "Cmd+Ctrl+X is not Cut");
         assert!(!search_chord(MAC_CMD, true));
         assert!(search_chord(Modifiers { ctrl: true, ..MAC_CMD }, true));
     }