Auto Width Rotating Text
The chip resizes to hug each word as it rolls in, so the sentence closes up around short words instead of leaving a gap. A monospace chip lets width animate in exact ch steps per word.
Also known as: rotating text dynamic width, resizing word rotator, text rotator that fits each word.
I'm a
designerdevwriterfounder
HTML
<div class="txt-auto-width-rotating-text">I'm a
<span class="txt-auto-width-rotating-text-chip">
<span class="txt-auto-width-rotating-text-track">
<span>designer</span><span>dev</span><span>writer</span><span>founder</span><span aria-hidden="true">designer</span>
</span>
</span>
</div>CSS
.txt-auto-width-rotating-text {
--c: var(--txt-color, #3b82f6);
font-size: var(--txt-size, 32px);
font-family: system-ui, sans-serif;
font-weight: 700;
line-height: 1.2;
display: flex;
align-items: center;
gap: 0.3em;
white-space: nowrap;}
.txt-auto-width-rotating-text-chip {
display: block;
/* width in ch = letters in the word; content-box keeps the padding outside it */
box-sizing: content-box;
width: 8ch;
height: 1.2em;
padding: 0.04em 0.3em;
overflow: hidden;
border-radius: 0.22em;
background: color-mix(in srgb, var(--c) 14%, transparent);
box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--c) 30%, transparent);
color: var(--c);
font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
/* 4 words x 2s = 8s */
animation: txt-auto-width-rotating-text-fit 8s cubic-bezier(0.65, 0, 0.35, 1) infinite;
}
.txt-auto-width-rotating-text-track {
display: flex;
flex-direction: column;
animation: txt-auto-width-rotating-text-roll 8s cubic-bezier(0.65, 0, 0.35, 1) infinite;
}
.txt-auto-width-rotating-text-track span {
height: 1.2em;
}
@keyframes txt-auto-width-rotating-text-fit {
0%, 18.13% { width: 8ch; }
25%, 43.13% { width: 3ch; }
50%, 68.13% { width: 6ch; }
75%, 93.13% { width: 7ch; }
100% { width: 8ch; }
}
@keyframes txt-auto-width-rotating-text-roll {
0%, 18.13% { transform: translateY(0); }
25%, 43.13% { transform: translateY(-1.2em); }
50%, 68.13% { transform: translateY(-2.4em); }
75%, 93.13% { transform: translateY(-3.6em); }
100% { transform: translateY(-4.8em); }
}
@media (prefers-reduced-motion: reduce) {
.txt-auto-width-rotating-text, .txt-auto-width-rotating-text *, .txt-auto-width-rotating-text::before, .txt-auto-width-rotating-text::after, .txt-auto-width-rotating-text *::before, .txt-auto-width-rotating-text *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--txt-coloron the element or a parent. Currently previewing#3b82f6. - Font size: set
--txt-size. Every other dimension is inem, so the whole thing scales together. Currently previewing40px. - 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.