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src/components/tab_switcher/tab_switcher.jsx

@@ -111,7 +111,7 @@ export default {
               type="button"
               role="tab"
             >
-              <img src={props.image} title={props['image-tooltip']} />
+              <img src={props.image} alt={props['image-tooltip']} title={props['image-tooltip']} />
               {props.label ? '' : props.label}
             </button>
           </div>