02修正した値を戻せる変更履歴 diff

<main class="stage">
  <section class="dh is-demo" id="dh" aria-label="見積変更履歴">
    <header class="dh__h">
      <span class="dh__ic" aria-hidden="true"><svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor"><g><path d="M216 128a88 88 0 1 1-88-88a88 88 0 0 1 88 88" opacity=".2"/><path d="M224 128a96 96 0 0 1-94.71 96H128a95.38 95.38 0 0 1-65.9-26.2a8 8 0 0 1 11-11.63a80 80 0 1 0-1.67-114.78a3 3 0 0 1-.26.25L44.59 96H72a8 8 0 0 1 0 16H24a8 8 0 0 1-8-8V56a8 8 0 0 1 16 0v29.8L60.25 60A96 96 0 0 1 224 128"/></g></svg></span>
      <h2 class="dh__t">変更履歴</h2>
      <span class="dh__n" id="dh-n" data-t="{n}箇所を変更" aria-live="polite">3箇所を変更</span>
    </header>
    <ul class="dh__list" id="dh-list">
      <li class="dh__row" data-row="1">
        <span class="dh__f">納期</span>
        <p class="dh__diff">
          <span class="dh__a"><del>10月15日</del> → <ins>10月8日</ins></span>
          <span class="dh__b"><b>10月15日</b><i class="dh__tag">戻しました</i></span>
        </p>
        <button class="dh__undo" type="button" aria-pressed="false" data-f="納期">
          <span class="dh__u" aria-hidden="true"><svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor"><g><path d="M216 128a88 88 0 1 1-88-88a88 88 0 0 1 88 88" opacity=".2"/><path d="M224 128a96 96 0 0 1-94.71 96H128a95.38 95.38 0 0 1-65.9-26.2a8 8 0 0 1 11-11.63a80 80 0 1 0-1.67-114.78a3 3 0 0 1-.26.25L44.59 96H72a8 8 0 0 1 0 16H24a8 8 0 0 1-8-8V56a8 8 0 0 1 16 0v29.8L60.25 60A96 96 0 0 1 224 128"/></g></svg></span>
          元に戻す
        </button>
      </li>
      <li class="dh__row" data-row="2">
        <span class="dh__f">担当者</span>
        <p class="dh__diff">
          <span class="dh__a"><del>イ・ジュン</del> → <ins>パク・ソア</ins></span>
          <span class="dh__b"><b>イ・ジュン</b><i class="dh__tag">戻しました</i></span>
        </p>
        <button class="dh__undo" type="button" aria-pressed="false" data-f="担当者">
          <span class="dh__u" aria-hidden="true"><svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor"><g><path d="M216 128a88 88 0 1 1-88-88a88 88 0 0 1 88 88" opacity=".2"/><path d="M224 128a96 96 0 0 1-94.71 96H128a95.38 95.38 0 0 1-65.9-26.2a8 8 0 0 1 11-11.63a80 80 0 1 0-1.67-114.78a3 3 0 0 1-.26.25L44.59 96H72a8 8 0 0 1 0 16H24a8 8 0 0 1-8-8V56a8 8 0 0 1 16 0v29.8L60.25 60A96 96 0 0 1 224 128"/></g></svg></span>
          元に戻す
        </button>
      </li>
      <li class="dh__row" data-row="3">
        <span class="dh__f">数量</span>
        <p class="dh__diff">
          <span class="dh__a"><del>120</del> → <ins>150</ins></span>
          <span class="dh__b"><b>120</b><i class="dh__tag">戻しました</i></span>
        </p>
        <button class="dh__undo" type="button" aria-pressed="false" data-f="数量">
          <span class="dh__u" aria-hidden="true"><svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor"><g><path d="M216 128a88 88 0 1 1-88-88a88 88 0 0 1 88 88" opacity=".2"/><path d="M224 128a96 96 0 0 1-94.71 96H128a95.38 95.38 0 0 1-65.9-26.2a8 8 0 0 1 11-11.63a80 80 0 1 0-1.67-114.78a3 3 0 0 1-.26.25L44.59 96H72a8 8 0 0 1 0 16H24a8 8 0 0 1-8-8V56a8 8 0 0 1 16 0v29.8L60.25 60A96 96 0 0 1 224 128"/></g></svg></span>
          元に戻す
        </button>
      </li>
    </ul>
    <p class="dh__live" aria-live="polite" id="dh-live">項目を元に戻すとここに表示されます</p>
  </section>
</main>

@use "sass:color";
@use "../../../../site/static/demo-tokens" as *;

$duration: $dur-quick;
$easing: $ease-spring;
$color: $subject-blue;

@include stage($stage-paper);

$line: color.mix($subject-ink, $stage-paper, 14%);
$soft: color.mix($subject-blue, $stage-paper, 7%);

.dh {
  box-sizing: border-box;
  width: min(304px, 92vw);
  padding: $sp-3;
  border: 1px solid $line;
  border-radius: $r-card;
  background: $stage-paper;
  color: $subject-ink;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 12px;
  line-height: 1.3;
}

.dh__h {
  display: flex;
  align-items: center;
  gap: $sp-1;
  margin: 0 0 $sp-2;
}
.dh__ic { display: inline-flex; width: 14px; height: 14px; color: $color; }
.dh__t { margin: 0; font-size: 12px; font-weight: 700; }
.dh__n {
  margin-left: auto;
  padding: 0 $sp-2;
  border-radius: $r-pill;
  background: $soft;
  color: $subject-blue-deep;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.7;
}

.dh__list {
  display: grid;
  gap: $sp-1;
  margin: 0;
  padding: 0;
  list-style: none;
}

// ── 이력 한 줄 ────────────────────────────────────
.dh__row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: $sp-2;
  padding: $sp-1 $sp-2;
  border: 1px solid $line;
  border-radius: $r-sm;
  background: $stage-paper;
}
.dh__f { color: rgba(23, 20, 26, .72); font-weight: 700; }

// 두 상태를 겹쳐 두고 steps 로 자른다 — 반투명 유령 프레임 금지
.dh__diff { position: relative; margin: 0; min-height: 18px; }
.dh__a, .dh__b { position: absolute; inset: 0; display: inline-flex; align-items: center; gap: $sp-1; }
.dh__b { visibility: hidden; }
.dh__row.is-back .dh__a { visibility: hidden; }
.dh__row.is-back .dh__b { visibility: visible; }

.dh__diff del {
  color: $error;
  font-size: 11px;
  text-decoration: line-through;
  text-decoration-thickness: 1.5px;
}
.dh__diff ins {
  color: $color;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
.dh__b b { color: $subject-ink; font-weight: 700; }
.dh__tag {
  padding: 0 4px;
  border-radius: $r-xs;
  background: $subject-mint;
  color: $subject-ink;
  font-size: 10px;
  font-style: normal;
  font-weight: 700;
}

.dh__undo {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0 $sp-2;
  border: 1px solid $line;
  border-radius: $r-pill;
  background: $stage-paper;
  color: $subject-ink;
  font-family: inherit;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.7;
  cursor: pointer;
}
.dh__undo:focus-visible { outline: 2px solid $color; outline-offset: 2px; }
.dh__u { display: inline-flex; width: 11px; height: 11px; }
.dh__row.is-back .dh__undo { background: $soft; color: $color; }
.dh__row.is-back .dh__u { transform: rotate(-360deg); transition: transform $dur-base $easing; }

.dh__live {
  margin: $sp-2 0 0;
  color: rgba(23, 20, 26, .72);
  font-size: 10px;
}

// ── 격자 미리보기 전용 2초 루프 ─────────────────────
// 되돌림은 steps 컷으로 한 프레임에 자르고, 프레임 수는 아이콘 회전과 칩 팝이 채운다
@keyframes dh-a-1 { 0%, 24% { visibility: visible; } 25%, 87% { visibility: hidden; } 88%, 100% { visibility: visible; } }
@keyframes dh-b-1 { 0%, 24% { visibility: hidden; } 25%, 87% { visibility: visible; } 88%, 100% { visibility: hidden; } }
@keyframes dh-a-2 { 0%, 54% { visibility: visible; } 55%, 87% { visibility: hidden; } 88%, 100% { visibility: visible; } }
@keyframes dh-b-2 { 0%, 54% { visibility: hidden; } 55%, 87% { visibility: visible; } 88%, 100% { visibility: hidden; } }
@keyframes dh-spin-1 {
  0%, 24% { transform: rotate(0deg); }
  30%, 87% { transform: rotate(-360deg); }
  88%, 100% { transform: rotate(0deg); }
}
@keyframes dh-spin-2 {
  0%, 54% { transform: rotate(0deg); }
  60%, 87% { transform: rotate(-360deg); }
  88%, 100% { transform: rotate(0deg); }
}
@keyframes dh-pop-1 {
  0%, 24% { transform: scale(1); }
  27% { transform: scale(1.14); }
  31%, 87% { transform: scale(1); }
  88%, 100% { transform: scale(1); }
}
@keyframes dh-pop-2 {
  0%, 54% { transform: scale(1); }
  57% { transform: scale(1.14); }
  61%, 100% { transform: scale(1); }
}
@keyframes dh-n-tick {
  0%, 24% { transform: translateX(0); }
  25%, 54% { transform: translateX(-2px); }
  55%, 87% { transform: translateX(-4px); }
  88%, 100% { transform: translateX(0); }
}

.dh.is-demo {
  .dh__row[data-row="1"] .dh__a { animation-name: dh-a-1; }
  .dh__row[data-row="1"] .dh__b { animation-name: dh-b-1; }
  .dh__row[data-row="2"] .dh__a { animation-name: dh-a-2; }
  .dh__row[data-row="2"] .dh__b { animation-name: dh-b-2; }
  .dh__a, .dh__b {
    animation-duration: $dur-loop;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
  .dh__row[data-row="1"] .dh__u { animation-name: dh-spin-1; }
  .dh__row[data-row="2"] .dh__u { animation-name: dh-spin-2; }
  .dh__u {
    animation-duration: $dur-loop;
    animation-timing-function: $easing;
    animation-iteration-count: infinite;
  }
  .dh__row[data-row="1"] .dh__undo { animation-name: dh-pop-1; }
  .dh__row[data-row="2"] .dh__undo { animation-name: dh-pop-2; }
  .dh__undo {
    animation-duration: $dur-loop;
    animation-timing-function: $ease-pop;
    animation-iteration-count: infinite;
  }
  .dh__n {
    animation-name: dh-n-tick;
    animation-duration: $dur-loop;
    animation-timing-function: steps(1, end);
    animation-iteration-count: infinite;
  }
}

@media (max-width: 340px) {
  .dh { padding: $sp-2; font-size: 11px; }
  .dh__h { margin-bottom: $sp-1; }
  .dh__row { padding: 0 $sp-2; }
  .dh__f { font-size: 10px; }
  .dh__undo { font-size: 10px; }
  .dh__live { margin-top: $sp-1; }
}

@media (prefers-reduced-motion: reduce) {
  .dh__row.is-back .dh__u { transform: none; transition: none; }
  .dh.is-demo .dh__a,
  .dh.is-demo .dh__b,
  .dh.is-demo .dh__u,
  .dh.is-demo .dh__undo,
  .dh.is-demo .dh__n { animation: none !important; transform: none !important; }
  // 움직임만 끄고 판정 결과는 남긴다 — 1·2번 줄은 되돌린 상태
  .dh.is-demo .dh__row[data-row="1"] .dh__a,
  .dh.is-demo .dh__row[data-row="2"] .dh__a { visibility: hidden !important; }
  .dh.is-demo .dh__row[data-row="1"] .dh__b,
  .dh.is-demo .dh__row[data-row="2"] .dh__b { visibility: visible !important; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffffff;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.dh {
  box-sizing: border-box;
  width: min(304px, 92vw);
  padding: 12px;
  border: 1px solid rgb(87.262745098%, 87.0980392157%, 87.4274509804%);
  border-radius: 16px;
  background: #ffffff;
  color: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  font-size: 12px;
  line-height: 1.3;
}

.dh__h {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0 0 8px;
}

.dh__ic {
  display: inline-flex;
  width: 14px;
  height: 14px;
  color: #2f6df6;
}

.dh__t {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
}

.dh__n {
  margin-left: auto;
  padding: 0 8px;
  border-radius: 999px;
  background: rgb(94.2901960784%, 95.9921568627%, 99.7529411765%);
  color: #0a4fe8;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.7;
}

.dh__list {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.dh__row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 8px;
  padding: 4px 8px;
  border: 1px solid rgb(87.262745098%, 87.0980392157%, 87.4274509804%);
  border-radius: 8px;
  background: #ffffff;
}

.dh__f {
  color: rgba(23, 20, 26, 0.72);
  font-weight: 700;
}

.dh__diff {
  position: relative;
  margin: 0;
  min-height: 18px;
}

.dh__a, .dh__b {
  position: absolute;
  inset: 0;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.dh__b {
  visibility: hidden;
}

.dh__row.is-back .dh__a {
  visibility: hidden;
}

.dh__row.is-back .dh__b {
  visibility: visible;
}

.dh__diff del {
  color: #c2361a;
  font-size: 11px;
  text-decoration: line-through;
  text-decoration-thickness: 1.5px;
}

.dh__diff ins {
  color: #2f6df6;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.dh__b b {
  color: #17141a;
  font-weight: 700;
}

.dh__tag {
  padding: 0 4px;
  border-radius: 4px;
  background: #4cd4a6;
  color: #17141a;
  font-size: 10px;
  font-style: normal;
  font-weight: 700;
}

.dh__undo {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0 8px;
  border: 1px solid rgb(87.262745098%, 87.0980392157%, 87.4274509804%);
  border-radius: 999px;
  background: #ffffff;
  color: #17141a;
  font-family: inherit;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.7;
  cursor: pointer;
}

.dh__undo:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 2px;
}

.dh__u {
  display: inline-flex;
  width: 11px;
  height: 11px;
}

.dh__row.is-back .dh__undo {
  background: rgb(94.2901960784%, 95.9921568627%, 99.7529411765%);
  color: #2f6df6;
}

.dh__row.is-back .dh__u {
  transform: rotate(-360deg);
  transition: transform 300ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.dh__live {
  margin: 8px 0 0;
  color: rgba(23, 20, 26, 0.72);
  font-size: 10px;
}

@keyframes dh-a-1 {
  0%, 24% {
    visibility: visible;
  }
  25%, 87% {
    visibility: hidden;
  }
  88%, 100% {
    visibility: visible;
  }
}
@keyframes dh-b-1 {
  0%, 24% {
    visibility: hidden;
  }
  25%, 87% {
    visibility: visible;
  }
  88%, 100% {
    visibility: hidden;
  }
}
@keyframes dh-a-2 {
  0%, 54% {
    visibility: visible;
  }
  55%, 87% {
    visibility: hidden;
  }
  88%, 100% {
    visibility: visible;
  }
}
@keyframes dh-b-2 {
  0%, 54% {
    visibility: hidden;
  }
  55%, 87% {
    visibility: visible;
  }
  88%, 100% {
    visibility: hidden;
  }
}
@keyframes dh-spin-1 {
  0%, 24% {
    transform: rotate(0deg);
  }
  30%, 87% {
    transform: rotate(-360deg);
  }
  88%, 100% {
    transform: rotate(0deg);
  }
}
@keyframes dh-spin-2 {
  0%, 54% {
    transform: rotate(0deg);
  }
  60%, 87% {
    transform: rotate(-360deg);
  }
  88%, 100% {
    transform: rotate(0deg);
  }
}
@keyframes dh-pop-1 {
  0%, 24% {
    transform: scale(1);
  }
  27% {
    transform: scale(1.14);
  }
  31%, 87% {
    transform: scale(1);
  }
  88%, 100% {
    transform: scale(1);
  }
}
@keyframes dh-pop-2 {
  0%, 54% {
    transform: scale(1);
  }
  57% {
    transform: scale(1.14);
  }
  61%, 100% {
    transform: scale(1);
  }
}
@keyframes dh-n-tick {
  0%, 24% {
    transform: translateX(0);
  }
  25%, 54% {
    transform: translateX(-2px);
  }
  55%, 87% {
    transform: translateX(-4px);
  }
  88%, 100% {
    transform: translateX(0);
  }
}
.dh.is-demo .dh__row[data-row="1"] .dh__a {
  animation-name: dh-a-1;
}
.dh.is-demo .dh__row[data-row="1"] .dh__b {
  animation-name: dh-b-1;
}
.dh.is-demo .dh__row[data-row="2"] .dh__a {
  animation-name: dh-a-2;
}
.dh.is-demo .dh__row[data-row="2"] .dh__b {
  animation-name: dh-b-2;
}
.dh.is-demo .dh__a, .dh.is-demo .dh__b {
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}
.dh.is-demo .dh__row[data-row="1"] .dh__u {
  animation-name: dh-spin-1;
}
.dh.is-demo .dh__row[data-row="2"] .dh__u {
  animation-name: dh-spin-2;
}
.dh.is-demo .dh__u {
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
  animation-iteration-count: infinite;
}
.dh.is-demo .dh__row[data-row="1"] .dh__undo {
  animation-name: dh-pop-1;
}
.dh.is-demo .dh__row[data-row="2"] .dh__undo {
  animation-name: dh-pop-2;
}
.dh.is-demo .dh__undo {
  animation-duration: 2s;
  animation-timing-function: cubic-bezier(0.2, 1.4, 0.4, 1);
  animation-iteration-count: infinite;
}
.dh.is-demo .dh__n {
  animation-name: dh-n-tick;
  animation-duration: 2s;
  animation-timing-function: steps(1, end);
  animation-iteration-count: infinite;
}

@media (max-width: 340px) {
  .dh {
    padding: 8px;
    font-size: 11px;
  }
  .dh__h {
    margin-bottom: 4px;
  }
  .dh__row {
    padding: 0 8px;
  }
  .dh__f {
    font-size: 10px;
  }
  .dh__undo {
    font-size: 10px;
  }
  .dh__live {
    margin-top: 4px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .dh__row.is-back .dh__u {
    transform: none;
    transition: none;
  }
  .dh.is-demo .dh__a,
  .dh.is-demo .dh__b,
  .dh.is-demo .dh__u,
  .dh.is-demo .dh__undo,
  .dh.is-demo .dh__n {
    animation: none !important;
    transform: none !important;
  }
  .dh.is-demo .dh__row[data-row="1"] .dh__a,
  .dh.is-demo .dh__row[data-row="2"] .dh__a {
    visibility: hidden !important;
  }
  .dh.is-demo .dh__row[data-row="1"] .dh__b,
  .dh.is-demo .dh__row[data-row="2"] .dh__b {
    visibility: visible !important;
  }
}

// 실제 동작: 되돌리기를 누른 항목만 이전 값으로 돌아간다 (화면 표시와 aria 상태 둘 다).
var dh = document.getElementById('dh');
var dhN = document.getElementById('dh-n');
var dhLive = document.getElementById('dh-live');
var dhLeft = 3;
function dhCount() {
  dhN.textContent = dhN.getAttribute('data-t').replace('{n}', dhLeft);
}
document.querySelectorAll('.dh__undo').forEach(function (b) {
  b.addEventListener('click', function () {
    dh.classList.remove('is-demo');
    var row = b.closest('.dh__row');
    var back = row.classList.toggle('is-back');
    b.setAttribute('aria-pressed', back ? 'true' : 'false');
    dhLeft += back ? -1 : 1;
    dhCount();
    dhLive.textContent = back
      ? b.getAttribute('data-f') + 'を前の値に戻しました'
      : b.getAttribute('data-f') + 'を再び修正しました';
  });
});

import { useState } from "react";
import type { CSSProperties } from "react";
import styles from "./ChangeHistoryDiff.module.scss";

export type ChangeHistoryDiffProps = {
  heading?: string;
  groupLabel?: string;
  undoLabel?: string;
  revertedTag?: string;
  liveHint?: string;
  restoredMsg?: string;
  editedAgainMsg?: string;
  demo?: boolean;
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };

type Field = { key: string; f: string; oldV: string; newV: string };

const FIELDS: Field[] = [
  { key: "due", f: "Due date", oldV: "Oct 15", newV: "Oct 8" },
  { key: "owner", f: "Owner", oldV: "Lee Jun", newV: "Park Seo-a" },
  { key: "qty", f: "Qty", oldV: "120", newV: "150" },
];

function UndoIcon() {
  return (
    <svg viewBox="0 0 256 256" width="1em" height="1em" fill="currentColor">
      <g>
        <path d="M216 128a88 88 0 1 1-88-88a88 88 0 0 1 88 88" opacity=".2" />
        <path d="M224 128a96 96 0 0 1-94.71 96H128a95.38 95.38 0 0 1-65.9-26.2a8 8 0 0 1 11-11.63a80 80 0 1 0-1.67-114.78a3 3 0 0 1-.26.25L44.59 96H72a8 8 0 0 1 0 16H24a8 8 0 0 1-8-8V56a8 8 0 0 1 16 0v29.8L60.25 60A96 96 0 0 1 224 128" />
      </g>
    </svg>
  );
}

export default function ChangeHistoryDiff({
  heading = "Change history",
  groupLabel = "Quote change history",
  undoLabel = "Undo",
  revertedTag = "Reverted",
  liveHint = "Undoing an item reports here",
  restoredMsg = " was restored to the previous value",
  editedAgainMsg = " was edited again",
  demo = true,
  duration = 220,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: ChangeHistoryDiffProps) {
  const [live, setLive] = useState(demo);
  const [back, setBack] = useState<Record<string, boolean>>({});
  const [msg, setMsg] = useState(liveHint);

  const left = FIELDS.filter((x) => !back[x.key]).length;
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  function undo(k: string, f: string) {
    setLive(false);
    const nextVal = !back[k];
    setBack({ ...back, [k]: nextVal });
    setMsg(nextVal ? f + restoredMsg : f + editedAgainMsg);
  }

  const cls = [styles.dh, live ? styles.isDemo : ""].filter(Boolean).join(" ");

  return (
    <section className={cls} style={vars} aria-label={groupLabel}>
      <header className={styles.h}>
        <span className={styles.ic} aria-hidden="true"><UndoIcon /></span>
        <h2 className={styles.t}>{heading}</h2>
        <span className={styles.n} aria-live="polite">
          {left} edited
        </span>
      </header>
      <ul className={styles.list}>
        {FIELDS.map((x, i) => (
          <li key={x.key} className={[styles.row, i + 1 <= 2 ? styles[`r${i + 1}`] : "", back[x.key] ? styles.isBack : ""].filter(Boolean).join(" ")}>
            <span className={styles.f}>{x.f}</span>
            <p className={styles.diff}>
              <span className={styles.a}>
                <del>{x.oldV}</del> → <ins>{x.newV}</ins>
              </span>
              <span className={styles.b}>
                <b>{x.oldV}</b>
                <i className={styles.tag}>{revertedTag}</i>
              </span>
            </p>
            <button className={styles.undoBtn} type="button" aria-pressed={!!back[x.key]} onClick={() => undo(x.key, x.f)}>
              <span className={styles.u} aria-hidden="true"><UndoIcon /></span>
              {undoLabel}
            </button>
          </li>
        ))}
      </ul>
      <p className={styles.live} aria-live="polite">{msg}</p>
    </section>
  );
}