Safari Mobile (Ipad 4) Animation (rotate) not working

Hey I do have the following code :

@keyframes rotate {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}
@-webkit-keyframes rotate {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

and the call :

-webkit-animation: rotate 1000ms infinite linear;

Unfortunately, my spinner is still not rotating on Ipad/Iphone

Any idea why ?

Thanks !