Why doesn't Lazyload show pictures?

I tried all the solution given on stackoverflow.

• Jquery LazyLoad.js Issue with Loading after Window Resize
• Lazy Load won't load visible images
• jQuery LazyLoad do not load images until scroll

• LazyLoad images not appearing until after a scroll

  Add a width height in css 
  Add a width height in HTML 
  $(window).resize(); 
  .trigger("lazyload");
  skip_invisible:true
  failure_limit : 1000
  

I also tried an alternative http://luis-almeida.github.io/unveil/

But the problem still the same. Unless I resize the window, (or $(window).resize(); in the console) picture don't show. However, if I put a threshold of 300, the pictures in the 300 first pixels will appear, not the others...

The most strange is that the problem is the same for the 2 plugins.

Any suggestion?