aria連接

無障礙aria標籤    https://www.w3.org/WAI/intro/aria
 

無障礙規則    https://www.w3.org/Translations/WCAG20-zh/

WCAG 2.0技術介紹  https://www.w3.org/TR/WCAG20-TECHS/

支持的狀態和屬性 https://www.w3.org/TR/wai-aria/states_and_properties#aria-labelledby

aria-labelledby https://developer.mozilla.org/enUS/docs/Web/Accessibility/ARIA/ARIA_Techniques/Using_the_aria-labelledby_attribute