<form class="csb-anim" role="search">
  <label class="csb-sr" for="csb-anim-i">Search</label>
  <span class="csb-anim-placeholder" aria-hidden="true">
    <span>Search "flexbox"...</span>
    <span>Search "modals"...</span>
    <span>Search "animations"...</span>
    <span>Search "flexbox"...</span>
  </span>
  <input id="csb-anim-i" type="search" name="q" />
</form>

.csb-anim { position: relative; display: inline-block; }
.csb-anim input {
  width: 240px; padding: 11px 14px;
  background: #1a1a28;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
  color: #f0eeff; font: 500 14px/1 system-ui, sans-serif;
  outline: none; position: relative; z-index: 1;
}
.csb-anim input:focus { border-color: #7c6cff; }
.csb-anim-placeholder {
  position: absolute;
  left: 14px; right: 14px; top: 0; bottom: 0;
  overflow: hidden; pointer-events: none;
  display: flex; align-items: center;
}
.csb-anim-placeholder span {
  flex-shrink: 0; width: 100%;
  font: 500 14px/1 system-ui, sans-serif; color: #b8b6d4;
  white-space: nowrap;
}
.csb-anim:not(:focus-within) .csb-anim-placeholder span:first-child {
  animation: csb-anim-cycle 9s steps(1) infinite;
}
.csb-anim input:not(:placeholder-shown) ~ .csb-anim-placeholder,
.csb-anim:focus-within .csb-anim-placeholder { display: none; }
@keyframes csb-anim-cycle {
  0%, 33%   { margin-left: 0; }
  33.5%, 66% { margin-left: -100%; }
  66.5%, 99% { margin-left: -200%; }
  100%       { margin-left: 0; }
}

.csb-sr {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  .csb-anim,
  .csb-anim * {
    animation: none !important;
  }
}