Example code is missing in QML Tutorial

example code is missing in QML tutorial, either in qtcreator and online docs:

1, online docs
the code field is black on the following website:

http://qt-project.org/doc/qt-5.0/qtquick/qtquick2-qml-tutorial1.html

http://doc-snapshot.qt-project.org/5.0/qtquick/qtquick2-qml-tutorial1.html

2, qt creator 2.6.1 within Qt5.0.0 SDK
(1) in help mode, in the main page of Qt5.0 docs.
(2) click "Examples and Tutorials" in the getting start section.
(3) find "Hello world" example under Qt Quick Essentials section and click it.
(4) it shows QML Tutorial page, all the example code is missing in the three tutorial chappters:

1,Basic Types
2,QML Components
3,States and Transitions