WAI-ARIAのproperty
from WAI-ARIA
要素の性質を表す
https://developer.mozilla.org/ja/docs/Learn/Accessibility/WAI-ARIA_basics#wai-aria_の導入
https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Techniques#states_and_properties
e.g.
aria-required
aria-labelledby
e.g. aria-required="true"
雑にまとめてaria属性と呼ぶ