You can get offSetTop
,current position of page with scrollTop
attribute:try this code
HTMLDocument doc2;
private void wb_LoadCompleted(object sender, NavigationEventArgs e)
{
doc2 = (HTMLDocument)wb.Document;
}
private void GetCurrentpositionOfPage_Click(object sender, RoutedEventArgs e)
{
MessageBox.Show( doc2.parentWindow.document.body.getAttribute("scrollTop").ToString());
}