diff --git a/components/style/properties/cascade.rs b/components/style/properties/cascade.rs
index 0834da93e89..3921a4034ed 100644
--- a/components/style/properties/cascade.rs
+++ b/components/style/properties/cascade.rs
@@ -465,17 +465,20 @@ fn tweak_when_ignoring_colors(
             }
         },
         _ => {
-            // We honor transparent and system colors more generally for all
-            // colors.
+            // We honor system colors more generally for all colors.
             //
-            // NOTE(emilio): This doesn't handle caret-color and
-            // accent-color because those use a slightly different syntax
-            // (<color> | auto for example). That's probably fine though, as
-            // using a system color for caret-color doesn't make sense (using
-            // currentColor is fine), and we ignore accent-color in
-            // high-contrast-mode anyways.
+            // We used to honor transparent but that causes accessibility
+            // regressions like bug 1740924.
+            //
+            // NOTE(emilio): This doesn't handle caret-color and accent-color
+            // because those use a slightly different syntax (<color> | auto for
+            // example).
+            //
+            // That's probably fine though, as using a system color for
+            // caret-color doesn't make sense (using currentColor is fine), and
+            // we ignore accent-color in high-contrast-mode anyways.
             if let Some(color) = declaration.color_value() {
-                if color.is_system() || alpha_channel(color, context) == 0 {
+                if color.is_system() {
                     return;
                 }
             }