fix: keep sr-only weekday header text visually hidden with inline styles

src/calendar.tsx

@@ -56,6 +56,18 @@ import YearDropdown from "./year_dropdown";
 import type { ClickOutsideHandler } from "./click_outside_wrapper";
 import type { Day } from "date-fns";
 
+const visuallyHiddenStyle: React.CSSProperties = {
+  position: "absolute",
+  width: "1px",
+  height: "1px",
+  padding: 0,
+  margin: "-1px",
+  overflow: "hidden",
+  clipPath: "inset(50%)",
+  whiteSpace: "nowrap",
+  border: 0,
+};
+
 interface YearDropdownProps extends React.ComponentPropsWithoutRef<
   typeof YearDropdown
 > {}
@@ -517,7 +529,12 @@ export default class Calendar extends Component<CalendarProps, CalendarState> {
           className={`react-datepicker__day-name ${disabled ? "react-datepicker__day-name--disabled" : ""}`}
           role="columnheader"
         >
-          <span className="react-datepicker__sr-only">Week number</span>
+          <span
+            className="react-datepicker__sr-only"
+            style={visuallyHiddenStyle}
+          >
+            Week number
+          </span>
           <span aria-hidden="true">{this.props.weekLabel || "#"}</span>
         </div>,
       );
@@ -568,7 +585,12 @@ export default class Calendar extends Component<CalendarProps, CalendarState> {
               disabled ? "react-datepicker__day-name--disabled" : "",
             )}
           >
-            <span className="react-datepicker__sr-only">{fullDayName}</span>
+            <span
+              className="react-datepicker__sr-only"
+              style={visuallyHiddenStyle}
+            >
+              {fullDayName}
+            </span>
             <span aria-hidden="true">{weekDayName}</span>
           </div>
         );

src/test/calendar_test.test.tsx

@@ -2446,6 +2446,35 @@ describe("Calendar", () => {
     });
   });
 
+  it("should keep sr-only day name and week number spans visually hidden via inline styles", () => {
+    const { container } = render(
+      <Calendar
+        dateFormat={DATE_FORMAT}
+        onSelect={() => {}}
+        onClickOutside={() => {}}
+        dropdownMode="scroll"
+        showWeekNumbers
+      />,
+    );
+
+    const srOnlySpans = container.querySelectorAll(
+      ".react-datepicker__day-name > span.react-datepicker__sr-only",
+    );
+    expect(srOnlySpans).toHaveLength(8);
+
+    srOnlySpans.forEach((span) => {
+      const { style } = span as HTMLElement;
+      expect(style.position).toBe("absolute");
+      expect(style.width).toBe("1px");
+      expect(style.height).toBe("1px");
+      expect(style.padding).toBe("0px");
+      expect(style.margin).toBe("-1px");
+      expect(style.overflow).toBe("hidden");
+      expect(style.clipPath).toBe("inset(50%)");
+      expect(style.whiteSpace).toBe("nowrap");
+    });
+  });
+
   it("should have a next-button with the provided aria-label for year", () => {
     const ariaLabel = "A label in my native language for next year";
     const { container } = render(