As an application developer, I want to keep the animation effect without its side-effect caused by wrapping DOM elements.
ZKCK-76 is caused by zjq.slideDown() and zjq.slideUp()
1. click the angle to close the east
2. click the title to expand the east
iframe reloads itself
iframe doesn't reload
Caused by slideDown()
If we can replace the animation effect by CSS, that can avoid those problems and potential future problems for DOM manipulation.