[data-interlace] {
    position: relative;
    overflow: hidden;
}

[data-interlace] img {
    display: block;
    top: 0;
    width: 100%;
    height: 100%;
}

[data-interlace] img:first-of-type {
    z-index: 1;
}

[data-interlace=loaded] img:first-of-type {
    position: absolute;
}

[data-interlace] img + img {
    position: absolute;
    opacity: 0;
    -webkit-transition-duration: 500ms;
            transition-duration: 500ms;
    -webkit-transition-property: opacity;
            transition-property: opacity;
}

[data-interlace=loaded] img + img {
    position: absolute;
    opacity: 1;
    z-index: 1;
}

[data-interlace=loading]::after {
    position: absolute;
    display: block;
    margin-top: -10px;
    margin-left: -10px;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    bottom: 50%;
    right: 50%;
    border-radius: 10px;
    content: '';
    -webkit-box-shadow: 0 1px 0 0 rgba(200, 200, 200, 0.8);
            box-shadow: 0 1px 0 0 rgba(200, 200, 200, 0.8);
    -webkit-animation: interlace-load-anim 600ms linear infinite;
            animation: interlace-load-anim 600ms linear infinite;
}

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

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