css实现点点点加载效果

HTML
订单提交中…
css
dot {
display: inline-block;
height: 1em; line-height: 1;
vertical-align: -.25em;
overflow: hidden;
}
dot::before {
display: block;
content: ‘…\A…\A.’;
white-space: pre-wrap;
animation: dot 3s infinite step-start both;
}
@keyframes dot {
33% { transform: translateY(-2em); }
66% { transform: translateY(-1em); }
}