Live Transcription Words
Spoken words land one by one in a transcript card, arriving blurred and faint as a guess, then settling into solid text. One animated @property drives every word, so the sentence clears together.
Also known as: live transcription animation, speech to text animation css, live captions css, voice transcript animation.
Listening
EN
Can you move my 3pm with Priya to Thursday and send her the new invite
HTML
<div class="aia-live-transcription" role="status" aria-label="Live transcription">
<div class="aia-live-transcription-head">
<span class="aia-live-transcription-dot"></span>
<span>Listening</span>
<span class="aia-live-transcription-lang">EN</span>
</div>
<p class="aia-live-transcription-text"><span style="--i: 0">Can</span> <span style="--i: 1">you</span> <span style="--i: 2">move</span> <span style="--i: 3">my</span> <span style="--i: 4">3pm</span> <span style="--i: 5">with</span> <span style="--i: 6">Priya</span> <span style="--i: 7">to</span> <span style="--i: 8">Thursday</span> <span style="--i: 9">and</span> <span style="--i: 10">send</span> <span style="--i: 11">her</span> <span style="--i: 12">the</span> <span style="--i: 13">new</span> <span style="--i: 14">invite</span></p>
</div>CSS
@property --aia-live-transcription-t {
syntax: "<number>";
inherits: true;
initial-value: 0;
}
.aia-live-transcription {
--c: var(--aia-color, #7c5cff);
font-size: var(--aia-size, 16px);
font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
line-height: 1.4;
width: 22em;
padding: 1em 1.15em 1.1em;
box-sizing: border-box;
border-radius: 1em;
background: color-mix(in srgb, currentColor 4%, transparent);
box-shadow: inset 0 0 0 1px color-mix(in srgb, currentColor 12%, transparent);
animation: aia-live-transcription-clock 6.5s linear infinite;
}
.aia-live-transcription-head {
display: flex;
align-items: center;
gap: 0.5em;
margin-bottom: 0.6em;
font-size: 0.8em;
font-weight: 500;
color: color-mix(in srgb, currentColor 60%, transparent);
}
.aia-live-transcription-dot {
width: 0.55em;
height: 0.55em;
border-radius: 50%;
background: var(--c);
box-shadow: 0 0 0 0 color-mix(in srgb, var(--c) 50%, transparent);
animation: aia-live-transcription-ping 1.6s cubic-bezier(0.2, 0.6, 0.35, 1) infinite;
}
.aia-live-transcription-lang {
margin-left: auto;
padding: 0.1em 0.45em;
border-radius: 0.35em;
font-size: 0.85em;
letter-spacing: 0.04em;
background: color-mix(in srgb, currentColor 8%, transparent);
}
.aia-live-transcription-text {
margin: 0;
font-size: 1.12em;
font-weight: 500;
line-height: 1.45;
letter-spacing: -0.01em;
opacity: clamp(0, (0.95 - var(--aia-live-transcription-t)) * 16, 1);
}
.aia-live-transcription-text span {
--s: calc(0.04 + var(--i) * 0.036);
--in: clamp(0, (var(--aia-live-transcription-t) - var(--s)) * 14, 1);
--sure: clamp(0, (var(--aia-live-transcription-t) - var(--s) - 0.07) * 12, 1);
display: inline-block;
opacity: calc(var(--in) * (0.38 + var(--sure) * 0.62));
filter: blur(calc((1 - var(--in)) * 0.25em));
translate: 0 calc((1 - var(--in)) * 0.35em);
}
@keyframes aia-live-transcription-clock {
to { --aia-live-transcription-t: 1; }
}
@keyframes aia-live-transcription-ping {
70%, 100% { box-shadow: 0 0 0 0.5em transparent; }
}
@media (prefers-reduced-motion: reduce) {
.aia-live-transcription { animation: none; --aia-live-transcription-t: 0.85; }
.aia-live-transcription-dot { animation: none; }
}
@media (prefers-reduced-motion: reduce) {
.aia-live-transcription, .aia-live-transcription *, .aia-live-transcription::before, .aia-live-transcription::after, .aia-live-transcription *::before, .aia-live-transcription *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--aia-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--aia-size. Every other dimension is inem, so the whole thing scales together. Currently previewing16px. - Speed: change the duration on the
transitionoranimationshorthand. Staggered delays are relative, so they keep their rhythm. - Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.