这是csstricks.com的两个CSS滚动快照示例

• Example #0在Windows上的Chrome上运行
• Example #3不起作用

为什么其中一个有效，而另一个无效？两者有什么区别？

示例1：

.container {
    flex-basis: 50%;
    max-height: 100vh;
    overflow-y: scroll;
    border: 1px solid gray;
    scroll-snap-type: y mandatory;
    &.proximity {
            scroll-snap-type: y proximity;
    }
}

li {
    border-bottom: 1px solid white;
    padding: 3rem;
    font-size: 1.4rem;
    color: rgba(white,.5);
    background: lightgray;
    text-align: center;
    scroll-snap-align: start;
    display: flex;
    flex-flow: column;
    justify-content: center;
}

示例2：

body {
    font-family: sans-serif;
    scroll-snap-type: mandatory;
    scroll-snap-points-y: repeat(100vh);
    scroll-snap-type: y mandatory;
}
section {
    border-bottom: 1px solid white;
    padding: 1rem;
    height: 100vh;
    scroll-snap-align: start;
    text-align: center;
    position: relative;
}