omii-ui/dist/bootstrap/placeholders.css

使用OMII开发的WebComponents库，样式采用bootstrap。可以作为标准的esmodule使用

/*!
 * Bootstrap  v5.2.3 (https://getbootstrap.com/)
 * Copyright 2011-2022 The Bootstrap Authors
 * Copyright 2011-2022 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
 */.placeholder{display:inline-block;min-height:1em;vertical-align:middle;cursor:wait;background-color:currentcolor;opacity:.5}.placeholder.btn:before{display:inline-block;content:""}.placeholder-xs{min-height:.6em}.placeholder-sm{min-height:.8em}.placeholder-lg{min-height:1.2em}.placeholder-glow .placeholder{animation:placeholder-glow 2s ease-in-out infinite}@keyframes placeholder-glow{50%{opacity:.2}}.placeholder-wave{mask-image:linear-gradient(130deg,#000 55%,rgba(0,0,0,.8) 75%,#000 95%);mask-size:200% 100%;animation:placeholder-wave 2s linear infinite}@keyframes placeholder-wave{to{mask-position:-200% 0%}}