GWT - How to put Widget B on Widget A - help

I am looking someway to put widgets on each other (each on its layer or something...). Something like the Swing CardLayout but with a transparent background support.

For example

I have

Image img=new Image("imageA.png");
HTML h=new HTML("<img s开发者_运维百科rc=imageB.png>");

How to put "h" on "img" left upper corner?

Any useful comment is appreciated

You can use AbsolutePanel. It positions it's children at fixed coordinates so you can make them overlap.

You can either use AbsolutePanel from GWT. Or you can use CSS set z-index of h higher than img and set absolute position from CSS as you want.