按照用户的动作偏好,创建无限动画的字母效果。
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<h1 split-by="letter" letter-animation="breath">
animated letters
</h1>
@keyframes breath {
from {
animation-timing-function: ease-out;
}
to {
transform: scale(1.25) translateY(-5px) perspective(1px);
text-shadow: 0 0 40px var(--glow-color);
animation-timing-function: ease-in-out;
}
}
@media (prefers-reduced-motion:no-preference) {
[letter-animation] > span {
display: inline-block;
white-space: break-spaces;
}
[letter-animation=breath] {
--glow-color: white;
}
[letter-animation=breath]>span {
animation: breath 1.2s ease calc(var(--index) * 100 * 1ms) infinite alternate;
}
}
@media (prefers-reduced-motion:no-preference) and (prefers-color-scheme: light) {
[letter-animation=breath] {
--glow-color: black;
}
}
const span = (text, index) => {
const node = document.createElement('span')
node.textContent = text
node.style.setProperty('--index', index)
return node
}
const byLetter = text =>
[...text].map(span)
const {matches:motionOK} = window.matchMedia(
'(prefers-reduced-motion: no-preference)'
)
if (motionOK) {
const splitTargets = document.querySelectorAll('[split-by]')
splitTargets.forEach(node => {
let nodes = byLetter(node.innerText)
if (nodes)
node.firstChild.replaceWith(...nodes)
})
}