removed tab index

src/Addition.js

@@ -141,7 +141,7 @@ function Addition() {
           </label>
           <input
             onChange={(e) => handleResChange(e, nosLeft)}
-            type="text" id="input_result" size="2" tabIndex={1}
+            type="text" id="input_result" size="2"
             aria-labelledby="input_result_label" aria-required="true"
             ref={resInputField}/>
           <br/>
@@ -150,7 +150,7 @@ function Addition() {
           </label>
           <input
             onChange={(e) => handleCarryChange(e, noOfDigits, imdtResIdx)}
-            type="text" id="input_carry" size="2" tabIndex={2}
+            type="text" id="input_carry" size="2"
             aria-labelledby="input_carry_label" aria-required="true"
             ref={carryInputField}/>
         </form>

src/Subtraction.js

@@ -145,7 +145,7 @@ function Subtraction() {
           </label>
           <input
             onChange={(e) => handleResChange(e, nosLeft)}
-            type="text" id="input_result" size="2" tabIndex={1}
+            type="text" id="input_result" size="2"
             aria-labelledby="input_result_label" aria-required="true"
             ref={resInputField}/>
           <br/>
@@ -154,7 +154,7 @@ function Subtraction() {
           </label>
           <input
             onChange={(e) => handleCarryChange(e, noOfDigits, imdtResIdx)}
-            type="text" id="input_carry" size="2" tabIndex={2}
+            type="text" id="input_carry" size="2"
             aria-labelledby="input_carry_label" aria-required="true"
             ref={carryInputField}/>
         </form>