Метод setSelectionRange абстрактный

void setSelectionRange(int start, int end, [ String direction ])

Исходный код

@DomName('HTMLInputElement.setSelectionRange')
void setSelectionRange(int start, int end, [String direction]);

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https://api.dartlang.org/stable/1.24.3/dart-html/TextInputElementBase/setSelectionRange.html