требуемое свойство

bool требуется

Источник

@DomName('HTMLInputElement.required')
@DocsEditable()
bool get required =>
    _blink.BlinkHTMLInputElement.instance.required_Getter_(this);

void required=(bool значение)

Источник

@DomName('HTMLInputElement.required')
@DocsEditable()
set required(bool value) =>
    _blink.BlinkHTMLInputElement.instance.required_Setter_(this, value);

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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-html/InputElement/required.html