如何制作CSS剪贴显示背景背景，而仅在剪裁的部分中应用动画？

Question

您可以使用

::after

伪元素仅在框架内应用动画，以确保＃Screen-Container's

clip-path

Answer 1

@keyframes expandCircle {
    0% {
        clip-path: circle(0% at center);
    }
    100% {
        clip-path: circle(100% at center);
    }
}

@keyframes melt {
    0% {
        filter: blur(20px) contrast(400%) saturate(250%) brightness(125%);
        pointer-events: none;
    }
    100% {
        filter: none;
        pointer-events: all;
    }
}

#screen-container {
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: url("system/wallpaper/paint.bmp");
    background-repeat: no-repeat;
    background-size: cover;
    background-color: #000000;
}

#clip-circle {
    position: absolute;
    width: 100%;
    height: 100%;
    clip-path: circle(0% at center);
    animation: expandCircle 3s forwards;
    overflow: hidden;
}

#clip-circle::after {
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: inherit;
    background-size: cover;
    clip-path: inherit; 
    animation: melt 2s forwards;
}