Свойство pageYOffset

int pageYOffset

Источник

@DomName('Window.pageYOffset')
@DocsEditable()
int get pageYOffset =>
    _blink.BlinkWindow.instance.pageYOffset_Getter_(this).round();

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