Simultaneous CSS animation and spin transition

<style> 
div
{
width:50px;
height:100px;
background:red;
position:relative;
animation:myfirst 5s infinite alternate;
-webkit-animation:myfirst 5s infinite alternate;
}

@keyframes myfirst
{
0%   { left:0px; top:0px;}
25%  { left:200px; top:0px;}
50%  { left:200px; top:200px;}
75%  { left:0px; top:200px;}
100% { left:0px; top:0px;}
}


@-webkit-keyframes myfirst 
{
0%   { left:0px; top:0px;}
25%  { left:200px; top:0px;}
50%  { left:200px; top:200px;}
75%  { left:0px; top:200px;}
100% { left:0px; top:0px;}
}


</style>


<body>

<div></div>

</body>

Is it possible to add some sort of a rotate transition to this? I've tried adding the code to the div declaration and creating another selector, none of these appeared to work.

Solution

You should add and define another animation, perhaps like so:

@keyframes rotate
{
from {
        transform: rotate(0deg);
    }
to { 
        transform: rotate(360deg);
    }
}

And then add the animation to your element, separating it with a comma:

animation:myfirst 5s infinite alternate, rotate 2.5s linear infinite;

In this example note the following things:

2.5s I chose this to make two complete rotation in one go of your first animation, I thought it looked smoother.
linear gives you the feeling of endless rotation in the void. Try other functions if you don't want this effect.
I didn't put alternate because we want the element to spin continuously.

Demonstration