"CSS Flexible Box Layout Module Level 1" . _:vb50822417 . . _:vb50822419 "Rossen Atanassov" . _:vb50822421 . . "2018-11-19" . _:vb50822418 . _:vb50822419 . _:vb50822417 "Tab Atkins Jr." . "2021-03-15" . _:vb50822417 . _:vb50822421 . . _:vb50822421 . . _:vb50822420 "David Baron" . _:vb50822420 . _:vb50822420 . . . _:vb50822419 . _:vb50822418 . _:vb50822418 "Elika Etemad" .