A still — with scripts on, it runs right here The demo itself — scroll inside the frame
A still — with scripts on, it runs right here The demo itself — scroll inside the frame
Copy and paste, or save a file and hand it over. For a machine with no network, one “Everything” file is enough.
Everything in this panel, including the contents behind each URL, in one Markdown file — Large, so it goes as a file (copy is for 32 KB and under)
Character wave — Character wave on scroll Make a wave pass through a one-line heading and a small English line below it as the page scrolls. Split each line into inline-block characters and, from progress p in a 360vh pinned section, set character i’s vertical offset to translateY(−sin(p × 2 × 2π − i/n × 2π × 1.1) × 0.32em × sin(πp)); the wave passes through twice and the amplitude is squeezed to zero at both ends of the progress. Scale crest characters up to 1.18× and turn only characters whose sine exceeds 0.8 accent-coloured. Run the English line’s wave in the opposite direction. Do not wrap, and size the type with clamp from the viewport width. Keep the real text in aria-label, and with reduced motion leave the characters in a straight line. Implement it with CSS and JavaScript only, without any library. Do not drop: - Squeeze the amplitude to zero at both ends of progress so resting text is a straight line - Make positions a pure function of progress so the wave rewinds with the scroll - Never wrap the line; fit it at 375px with clamp - Keep the real text in aria-label and hide the split characters from screen readers A working example (one self-contained HTML file): https://design-vault.pages.dev/designs/motion-char-wave/demo.html
/designs/motion-char-wave/demo.html — One self-contained HTML file. CSS and plain JavaScript only; it fetches nothing.
<!doctype html>
<html lang="ja">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>48 文字の波 — Character wave on scroll</title>
<style>
/* dv-motion-base:start */
:root {
--ground: #FFFFFF;
--surface: #F3F5F8;
--ink: #14181F;
--muted: #5A6472;
--accent: #1F5FA8;
--rule: #D8DDE4;
--accent-soft: color-mix(in srgb, var(--accent) 12%, var(--ground));
--accent-mid: color-mix(in srgb, var(--accent) 45%, var(--ground));
--shade: color-mix(in srgb, var(--ink) 14%, transparent);
--font: "Zen Kaku Gothic New", "Hiragino Sans", "Noto Sans JP", "Yu Gothic", system-ui, sans-serif;
--mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
--t-label: 13px;
--t-body: 16px;
--t-lead: 20px;
--t-h2: 32px;
--t-h1: clamp(40px, 7vw, 72px);
--s1: 4px;
--s2: 8px;
--s3: 16px;
--s4: 24px;
--s5: 40px;
--s6: 64px;
--s7: 104px;
--radius: 12px;
--ease: cubic-bezier(.2, .7, .2, 1);
--dur: .7s;
--measure: 1080px;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
margin: 0;
background: var(--ground);
color: var(--ink);
font-family: var(--font);
font-size: var(--t-body);
line-height: 1.7;
font-feature-settings: "palt";
overflow-x: hidden;
}
h1, h2, h3, p, ul, ol, figure { margin: 0; padding: 0; }
ul, ol { list-style: none; }
.dv-wrap { width: min(100% - 2 * var(--s4), var(--measure)); margin-inline: auto; }
.dv-label {
min-height: 72vh;
display: grid;
align-content: center;
gap: var(--s3);
padding-block: var(--s6);
border-bottom: 1px solid var(--rule);
}
.dv-num { font-family: var(--mono); font-size: var(--t-lead); font-weight: 700; color: var(--accent); letter-spacing: .04em; }
.dv-name { font-size: var(--t-h1); font-weight: 700; line-height: 1.15; letter-spacing: .01em; }
.dv-ai { font-family: var(--mono); font-size: var(--t-lead); color: var(--muted); }
.dv-desc { font-size: var(--t-lead); color: var(--ink); }
.dv-hint { font-size: var(--t-label); color: var(--muted); letter-spacing: .12em; margin-top: var(--s4); }
.dv-stage { padding-block: var(--s7); }
.dv-h2 { font-size: var(--t-h2); font-weight: 700; line-height: 1.3; }
.dv-lead { font-size: var(--t-lead); color: var(--muted); }
.dv-eyebrow { font-family: var(--mono); font-size: var(--t-label); color: var(--accent); letter-spacing: .12em; text-transform: uppercase; }
.dv-card { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius); padding: var(--s4); }
.dv-ph {
border-radius: var(--radius);
background: linear-gradient(135deg, var(--accent-soft), var(--accent-mid) 60%, var(--accent));
aspect-ratio: 16 / 9;
}
.dv-ph--alt { background: linear-gradient(200deg, var(--surface), var(--accent-soft) 55%, var(--accent-mid)); }
.dv-ph--ink { background: linear-gradient(160deg, var(--ink), color-mix(in srgb, var(--ink) 55%, var(--accent))); }
.dv-end {
min-height: 60vh;
display: grid;
place-items: center;
border-top: 1px solid var(--rule);
color: var(--muted);
font-family: var(--mono);
font-size: var(--t-label);
letter-spacing: .12em;
}
/* dv-motion-base:end */
/* ---- この演出だけの CSS。色は var(--…) か color-mix() のみ ---- */
.stack { display: grid; gap: var(--s6); }
.cw-zone { height: 360vh; }
.cw-stick { position: sticky; top: 0; height: 100vh; display: grid; place-content: center; gap: var(--s5); }
.cw-line { display: flex; justify-content: center; font-size: clamp(24px, 7vw, 92px); font-weight: 700; line-height: 1.25; }
.cw-line--sub { font-size: clamp(14px, 3.4vw, 36px); color: var(--muted); }
.cw-ch { display: inline-block; will-change: transform; transition: color .2s linear; }
.cw-ch.is-crest { color: var(--accent); }
@media (prefers-reduced-motion: reduce) {
.cw-zone { height: auto; }
.cw-stick { position: static; height: auto; padding-block: var(--s6); }
}
</style>
</head>
<body data-motion-number="48">
<header class="dv-label">
<div class="dv-wrap">
<p class="dv-num">48</p>
<h1 class="dv-name">文字の波</h1>
<p class="dv-ai">Character wave on scroll</p>
<p class="dv-desc">波が文字の列を通り抜けていく</p>
<p class="dv-hint">SCROLL ↓</p>
</div>
</header>
<main class="dv-stage">
<div class="dv-wrap stack">
<section class="dv-card">
<p class="dv-eyebrow">Section 1</p>
<h2 class="dv-h2">見出しが入ります</h2>
<p class="dv-lead">本文のダミーです。スクロールすると、下の文字の列を波が通り抜けます。</p>
</section>
</div>
<section class="cw-zone" data-progress="pin">
<div class="cw-stick">
<div class="dv-wrap">
<p class="cw-line" data-wave="1" role="img" aria-label="波のように言葉が揺れる">波のように言葉が揺れる</p>
<p class="cw-line cw-line--sub" data-wave="-1" role="img" aria-label="The words sway like waves">The words sway like waves</p>
</div>
</div>
</section>
<div class="dv-wrap stack">
<section class="dv-card">
<p class="dv-eyebrow">Section 2</p>
<h2 class="dv-h2">見出しが入ります</h2>
<p class="dv-lead">本文のダミーです。波が過ぎると、文字は元の位置に戻ります。</p>
</section>
</div>
</main>
<footer class="dv-end">END — 48 文字の波</footer>
<script>
/* dv-motion-helpers:start */
const dvReduce = matchMedia('(prefers-reduced-motion: reduce)').matches;
document.documentElement.classList.add('js');
/**
* 画面に入った要素へ .is-in を付ける。
* data-reveal="repeat" の要素は画面を出たら外す（何度でも再生）。
*/
function dvReveal(selector = '[data-reveal]', { threshold = 0.2, rootMargin = '0px 0px -8% 0px' } = {}) {
const els = [...document.querySelectorAll(selector)];
if (dvReduce || !('IntersectionObserver' in window)) {
els.forEach((el) => el.classList.add('is-in'));
return;
}
const io = new IntersectionObserver((entries) => {
for (const e of entries) {
if (e.isIntersecting) {
e.target.classList.add('is-in');
if (e.target.dataset.reveal !== 'repeat') io.unobserve(e.target);
} else if (e.target.dataset.reveal === 'repeat') {
e.target.classList.remove('is-in');
}
}
}, { threshold, rootMargin });
els.forEach((el) => io.observe(el));
}
/**
* スクロール量を 0〜1 にして、各 [data-progress] 要素の CSS 変数 --p に書く。
* data-progress="through" : 要素の上端が画面の下端に来たとき 0、下端が画面の上端を抜けたとき 1
* data-progress="pin" : 要素の上端が画面の上端に来たとき 0、下端が画面の下端に来たとき 1
* （中に position: sticky の箱を持つ、背の高い区画用）
* data-progress="page" : ページ全体のスクロール量
* onUpdate(el, p) を渡すと、値が変わるたびに呼ばれる。
*/
function dvProgress(onUpdate) {
const els = [...document.querySelectorAll('[data-progress]')];
const clamp = (n) => Math.min(1, Math.max(0, n));
let queued = false;
const measure = () => {
queued = false;
const vh = window.innerHeight;
for (const el of els) {
const r = el.getBoundingClientRect();
let p;
if (el.dataset.progress === 'pin') p = r.height > vh ? -r.top / (r.height - vh) : 0;
else if (el.dataset.progress === 'page') {
const max = document.documentElement.scrollHeight - vh;
p = max > 0 ? window.scrollY / max : 0;
} else p = (vh - r.top) / (vh + r.height);
p = clamp(p);
el.style.setProperty('--p', p.toFixed(4));
if (onUpdate) onUpdate(el, p);
}
};
const request = () => {
if (!queued) { queued = true; requestAnimationFrame(measure); }
};
addEventListener('scroll', request, { passive: true });
addEventListener('resize', request);
measure();
}
/* dv-motion-helpers:end */
/* ---- この演出だけの JS ---- */
// 1 字ずつ <span> に割る。本物の文は aria-label に残し、割った字は読み上げから外す。
const lines = [...document.querySelectorAll('[data-wave]')].map((el) => {
const text = el.textContent;
el.textContent = '';
const chars = [...text].map((ch) => {
const s = document.createElement('span');
s.className = 'cw-ch';
s.setAttribute('aria-hidden', 'true');
s.textContent = ch === ' ' ? ' ' : ch;
el.append(s);
return s;
});
return { chars, dir: Number(el.dataset.wave) };
});
// 波は 2 回、列を通り抜ける。進みの両端では振れ幅 0 に絞って、止まった文字は一直線に戻す。
const TURNS = 2;
function place(p) {
const env = Math.sin(Math.PI * p);
for (const { chars, dir } of lines) {
const n = chars.length;
chars.forEach((c, i) => {
const phase = (p * TURNS * 2 * Math.PI) * dir - (i / n) * 2 * Math.PI * 1.1;
const s = Math.sin(phase);
c.style.transform = `translateY(${(-s * 0.32 * env).toFixed(3)}em) scale(${(1 + 0.18 * env * Math.max(0, s)).toFixed(3)})`;
c.classList.toggle('is-crest', env > 0.15 && s > 0.8);
});
}
}
if (!dvReduce) dvProgress((el, p) => place(p));
</script>
</body>
</html>