diff --git a/src/browser/tests/range.html b/src/browser/tests/range.html
index c1fb901f..d62ffe72 100644
--- a/src/browser/tests/range.html
+++ b/src/browser/tests/range.html
@@ -743,11 +743,11 @@
   // range1 start is before range2 start
   testing.expectEqual(-1, range1.compareBoundaryPoints(Range.START_TO_START, range2));
 
-  // range1 start is before range2 end
-  testing.expectEqual(-1, range1.compareBoundaryPoints(Range.START_TO_END, range2));
-
   // range1 end is after range2 start
-  testing.expectEqual(1, range1.compareBoundaryPoints(Range.END_TO_START, range2));
+  testing.expectEqual(1, range1.compareBoundaryPoints(Range.START_TO_END, range2));
+
+  // range1 start is before range2 end
+  testing.expectEqual(-1, range1.compareBoundaryPoints(Range.END_TO_START, range2));
 
   // range1 end is before range2 end
   testing.expectEqual(-1, range1.compareBoundaryPoints(Range.END_TO_END, range2));
@@ -767,11 +767,11 @@
   testing.expectEqual(0, range.compareBoundaryPoints(Range.START_TO_START, range));
   testing.expectEqual(0, range.compareBoundaryPoints(Range.END_TO_END, range));
 
-  // Start is before end
-  testing.expectEqual(-1, range.compareBoundaryPoints(Range.START_TO_END, range));
-
   // End is after start
-  testing.expectEqual(1, range.compareBoundaryPoints(Range.END_TO_START, range));
+  testing.expectEqual(1, range.compareBoundaryPoints(Range.START_TO_END, range));
+
+  // Start is before end
+  testing.expectEqual(-1, range.compareBoundaryPoints(Range.END_TO_START, range));
 }
 </script>
 
diff --git a/src/browser/webapi/Range.zig b/src/browser/webapi/Range.zig
index 1d1f6442..f88e210a 100644
--- a/src/browser/webapi/Range.zig
+++ b/src/browser/webapi/Range.zig
@@ -150,10 +150,10 @@ pub fn compareBoundaryPoints(self: *const Range, how_raw: i32, source_range: *co
             source_range._proto._start_offset,
         ),
         1 => AbstractRange.compareBoundaryPoints( // START_TO_END
-            self._proto._start_container,
-            self._proto._start_offset,
-            source_range._proto._end_container,
-            source_range._proto._end_offset,
+            self._proto._end_container,
+            self._proto._end_offset,
+            source_range._proto._start_container,
+            source_range._proto._start_offset,
         ),
         2 => AbstractRange.compareBoundaryPoints( // END_TO_END
             self._proto._end_container,
@@ -162,10 +162,10 @@ pub fn compareBoundaryPoints(self: *const Range, how_raw: i32, source_range: *co
             source_range._proto._end_offset,
         ),
         3 => AbstractRange.compareBoundaryPoints( // END_TO_START
-            self._proto._end_container,
-            self._proto._end_offset,
-            source_range._proto._start_container,
-            source_range._proto._start_offset,
+            self._proto._start_container,
+            self._proto._start_offset,
+            source_range._proto._end_container,
+            source_range._proto._end_offset,
         ),
         else => unreachable,
     };