Question

once the page is loaded, I want to “appear” three DIVs one after another.

how can I do this?

I know how to make a single div appear on mouseover but without any triggering, one after another using css, how can I achieve such smooth transition?

Answer 1

The trick is to perform an animation first to hide all of the elements (when the page loads), and chain that to the animation that will reveal the elements. This is a working example for you in PURE CSS & HTML:

div.slideIn { 
          position: absolute; 
          top: 200px; 
          width: 100px; 
          height: 100px; 
          border: 1px solid black; 
          animation-name: hide, slideIn;
          animation-duration: 5s;
          animation-timing-function: ease-in;
          animation-iteration-count: 1; 
          -moz-animation-name: hide, slideIn;
          -moz-animation-duration: 5s;
          -moz-animation-timing-function: ease-in;
          -moz-animation-iteration-count: 1; 
          -webkit-animation-name: hide, slideIn;
          -webkit-animation-duration: 5s;
          -webkit-animation-timing-function: ease-in;
          -webkit-animation-iteration-count: 1; 
          -o-animation-name: hide, slideIn;
          -o-animation-duration: 5s;
          -o-animation-timing-function: ease-in;
          -o-animation-iteration-count: 1; 
          opacity: 1;
      } 
      div.slideIn.first {
          left: 50px; 
          animation-delay: 0s, 0s;
          -moz-animation-delay: 0s, 0s;
          -webkit-animation-delay: 0s, 0s;
          -o-animation-delay: 0s, 0s;
      }
      div.slideIn.second {
          left: 150px;
          animation-delay: 0s, 2s;
          -moz-animation-delay: 0s, 2s;
          -webkit-animation-delay: 0s, 2s;
          -o-animation-delay: 0s, 2s;
      }
      div.slideIn.third {
          left: 250px;
          animation-delay: 0s, 4s;
          -moz-animation-delay: 0s, 4s;
          -webkit-animation-delay: 0s, 4s;
          -o-animation-delay: 0s, 4s;
      }
      @keyframes hide
      { 
          from { opacity: 0; } to { opacity: 0 }
      }
      @-moz-keyframes hide
      { 
          from { opacity: 0; } to { opacity: 0 }
      }
      @-webkit-keyframes hide
      { 
          from { opacity: 0; } to { opacity: 0 }
      }
      @-o-keyframes hide
      { 
          from { opacity: 0; } to { opacity: 0 }
      }
      @keyframes slideIn
      { 
            0% { opacity: 0; top: -100px; }
            1% { opacity: 1; top: -100px; }
          100% { opacity: 1; top:  200px; } 
      } 
      @-moz-keyframes slideIn
      { 
            0% { opacity: 0; top: -100px; }
            1% { opacity: 1; top: -100px; }
          100% { opacity: 1; top:  200px; } 
      } 
      @-webkit-keyframes slideIn
      { 
            0% { opacity: 0; top: -100px; }
            1% { opacity: 1; top: -100px; }
          100% { opacity: 1; top:  200px; } 
      } 
      @-o-keyframes slideIn
      { 
            0% { opacity: 0; top: -100px; }
            1% { opacity: 1; top: -100px; }
          100% { opacity: 1; top:  200px; } 
      } 
]
    

<div class="slideIn first">I slid in</div> 
    <div class="slideIn second">I'm 2nd</div> 
    <div class="slideIn third">I'm 3rd</div> 

Note: Remove the 1% line from the slideIn animation to fade in while sliding in.
Note: IE does not support CSS3 animations yet.