網址：https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/ARIA_Techniques/Using_the_aria-required_attribute

The aria-required attribute is used to indicate that user input is required on an element before a form can be submitted. This attribute can be used with any typical HTML form element; it is not limited to elements that have an ARIA role assigned.

aria-required屬性用于表明在一個form被提交之后，form里包含的某個元素需要用戶輸入。該屬性不僅限于具有ARIA role屬性賦值的元素，任何form內能夠包含的典型element都能夠維護該屬性。

HTML5 now has the required attribute, but aria-required is still useful for user agents that do not yet support HTML5.

雖然HTML5現在已經支持原生的required屬性了，但是對于那些尚無法支持HTML5的user agent來說，aria-required仍然非常有用。

Screen readers should announce the field as required.
Note that this attribute will not automatically change the presentation of the field.

該屬性并不會改變元素的視覺外觀。

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