I think in this example (found on http://qt-project.org/doc/qt-5/qmlfirststeps.html#animations) there is a mistake:

Rectangle {
color: "lightgray"
width: 200
height: 200

property int animatedValue: 0
SequentialAnimation on animatedValue {
loops: Animation.Infinite
PropertyAnimation

{ to: 150; duration: 1000 }

PropertyAnimation

{ to: 0; duration: 1000 }

}

Text

{ anchors.centerIn: parent text: animatedValue }

}

“text: animatedValue” should be “text: parent.animatedValue”. Another option could be add an id in Rectangle and use it in Text (i.e. myrect.animatedValue)

If I run this example in Qt, the rectangle doesn't show any text unless I change that line of code.