<div>
<span>00:00<span>время
</div>
<div>
<span class="timer" data-timer="00:00"> </span>время
</div>
.timer::before {
content: attr(data-timer);
}
<spam data-letter="П"></span>
<spam data-letter="р"></span>
<spam data-letter="и"></span>
<spam data-letter="в"></span>
<spam data-letter="е"></span>
<spam data-letter="т"></span>