Example of tweaking Vaadin's loading indicator to be announced by NVDA screen reader in Windows

AccessibleLoadingIndicator.java

package org.vaadin.tatu;

import com.vaadin.flow.component.UI;

public class AccessibleLoadingIndicator {
  
    private static void loading() {
        UI.getCurrent().getPage().executeJs(
                """
                        const indicator = document.getElementsByClassName('v-loading-indicator ')[0];
                        if (indicator) {
                          const label = document.createElement('label');
                          label.innerText = 'Loading';
                          label.setAttribute('role','alert');
                          label.id = 'indicator-label'
                          label.style.top = '-1000px';
                          label.style.left = '-1000px';
                          label.style.position = 'absolute';
                          indicator.innerText = '';
                          indicator.appendChild(label);
                          indicator.setAttribute('aria-live','assertive');
                          indicator.setAttribute('aria-labelledby','indicator-label');
                        }
                                            """);
    }
}