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)
Vertical writing — Vertical writing reveal Write a short vertical Japanese poem onto manuscript paper one character at a time. Put three lines in a writing-mode: vertical-rl box, read from the rightmost, each nine cells tall. Size a cell with clamp(30px, 6.2vw, 56px), draw the grid by stacking two linear-gradients at the cell length, and set each character at 72% of the cell. In a 380vh pinned section, over 0–85% progress, reveal one character at a time, top to bottom in the right-hand line and then the next line to the left. A revealing character starts 0.35em above, blurred by 4px and transparent, and settles over 0.5 seconds; only the most recently written character is accent-coloured. Show the written count below, such as "17 / 25". Keep the real text in each line’s aria-label, and with reduced motion show every character already written. Implement it with CSS and JavaScript only, without any library. Do not drop: - In a vertical writing box flex row runs top to bottom, so stack the lines as blocks to get right-to-left columns - Use one --cell for both grid lines and character advance, and no padding on the box - Characters appear in reading order and disappear from the end on scroll-back - Keep the real text in aria-label, and show every character with reduced motion A working example (one self-contained HTML file): https://design-vault.pages.dev/designs/motion-vertical-write/demo.html
/designs/motion-vertical-write/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>50 縦書きの筆記 — Vertical writing reveal</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); }
.vw-zone { height: 380vh; }
.vw-stick { position: sticky; top: 0; height: 100vh; display: grid; place-items: center; }
/* 原稿用紙の升目。行の幅と字の送りを同じ長さに揃えて、罫線が字の位置に合うようにする。 */
.vw-sheet {
--cell: clamp(30px, 6.2vw, 56px);
writing-mode: vertical-rl;
display: block;
width: max-content;
margin-inline: auto;
padding: 0;
border: 1px solid var(--rule);
border-radius: var(--radius);
background:
linear-gradient(to bottom, var(--rule) 1px, transparent 1px) 0 0 / 100% var(--cell),
linear-gradient(to left, var(--rule) 1px, transparent 1px) 0 0 / var(--cell) 100%;
background-color: var(--surface);
font-size: calc(var(--cell) * .72);
font-weight: 700;
line-height: var(--cell);
letter-spacing: calc(var(--cell) * .28);
max-width: 100%;
}
.vw-col { margin: 0; height: calc(var(--cell) * 9); width: var(--cell); text-align: center; white-space: nowrap; }
.vw-ch { display: inline-block; }
.js .vw-ch { opacity: 0; transform: translateY(-.35em); filter: blur(4px); transition: opacity .5s var(--ease), transform .5s var(--ease), filter .5s var(--ease); }
.js .vw-ch.is-on { opacity: 1; transform: none; filter: none; }
.vw-ch.is-head { color: var(--accent); }
.vw-count { margin-top: var(--s3); text-align: center; font-family: var(--mono); font-size: var(--t-label); color: var(--muted); letter-spacing: .12em; }
@media (prefers-reduced-motion: reduce) {
.vw-zone { height: auto; }
.vw-stick { position: static; height: auto; padding-block: var(--s6); }
.js .vw-ch { opacity: 1; transform: none; filter: none; transition: none; }
}
</style>
</head>
<body data-motion-number="50">
<header class="dv-label">
<div class="dv-wrap">
<p class="dv-num">50</p>
<h1 class="dv-name">縦書きの筆記</h1>
<p class="dv-ai">Vertical writing reveal</p>
<p class="dv-desc">縦書きの文が右の行から一字ずつ現れる</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、下の原稿用紙に縦書きの文が右の行から書き込まれます。</p>
</section>
</div>
<section class="vw-zone" data-progress="pin">
<div class="vw-stick">
<div>
<div class="vw-sheet" lang="ja">
<p class="vw-col">静かな朝の窓辺に</p>
<p class="vw-col">言葉は上から下へ</p>
<p class="vw-col">右から左へと流れる</p>
</div>
<p class="vw-count">25 / 25</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。書き終えた文は、そのまま残ります。</p>
</section>
</div>
</main>
<footer class="dv-end">END — 50 縦書きの筆記</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 ---- */
const cols = [...document.querySelectorAll('.vw-col')];
const countEl = document.querySelector('.vw-count');
// 1 字ずつ <span> に割る。行の順（右→左）と字の順（上→下）が、そのまま書く順になる。
const chars = [];
for (const col of cols) {
const text = col.textContent;
col.setAttribute('role', 'img');
col.setAttribute('aria-label', text);
col.textContent = '';
for (const ch of text) {
const s = document.createElement('span');
s.className = 'vw-ch';
s.setAttribute('aria-hidden', 'true');
s.textContent = ch;
col.append(s);
chars.push(s);
}
}
const set = (n) => {
chars.forEach((c, i) => {
c.classList.toggle('is-on', i < n);
c.classList.toggle('is-head', i === n - 1 && n < chars.length);
});
countEl.textContent = `${n} / ${chars.length}`;
};
if (dvReduce) set(chars.length);
else dvProgress((el, p) => set(Math.round(Math.min(1, p / 0.85) * chars.length)));
</script>
</body>
</html>