Tab to change focus element, sepcially for radio group, we shou tab to focus one radio button and use arrow to change select other radion button details to see:
Mac safari should do some setting(safari->preferences->advanced->accessibility and select the press Tab to highlight each item on a webpage) for tab radio, checkbox etc
VoiceOver can not read the other language if
the page lang at the top off the html page was "en" but en_US, so we should remove the attribute lang="en" or change it automatly.
Diffirent devices and browsers have diffirent issues, screen readers also have it's self issues.
