Follow Apple design guide lines

static/app.js

@@ -8,12 +8,17 @@ const BASE = document.documentElement.dataset.base || '/';
 const POLL_MS = 5000;
 // How long a dropped cursor waits for the player to report it got there.
 const SEEK_HOLD_MS = 10000;
+// How far an arrow key moves the progress cursor.
+const SEEK_KEY_MS = 10000;
 // And how long a pressed play or pause on the AVR waits for the same. The
 // Zidoo acknowledges the key press at once but takes a moment to act on it.
 const PLAY_HOLD_MS = 6000;
 // Motion turned down in the OS means cards change places without sliding.
 const CALM = matchMedia('(prefers-reduced-motion: reduce)');
 
+// Which way each arrow key moves a slider.
+const ARROWS = { ArrowRight: 1, ArrowUp: 1, ArrowLeft: -1, ArrowDown: -1 };
+
 const el = (sel, root = document) => root.querySelector(sel);
 const els = (sel, root = document) => Array.from(root.querySelectorAll(sel));
 
@@ -170,6 +175,10 @@ function paintVolume(room) {
   room.level.textContent = known ? room.volume : '—';
   // The fill and the knob riding it both size themselves off this.
   room.meter.style.setProperty('--level', known ? room.volume : 0);
+  // The knob is a slider to VoiceOver, which reads these rather than its digits.
+  if (known) room.level.setAttribute('aria-valuenow', room.volume);
+  else room.level.removeAttribute('aria-valuenow');
+  room.level.setAttribute('aria-disabled', String(!room.available));
   room.steps.forEach((button) => { button.disabled = !room.available; });
 }
 
@@ -282,6 +291,16 @@ function paintProgress(refs, known, position, duration) {
     if (known) label.style.setProperty('--half', `${label.offsetWidth / 2}px`);
   });
   el('[data-role="progress-total"]', progress).textContent = known ? clock(total) : '';
+
+  const cursor = el('[data-role="progress-cursor"]', progress);
+  const seekable = progress.classList.contains('seekable');
+  cursor.tabIndex = seekable ? 0 : -1;
+  cursor.setAttribute('aria-readonly', String(!seekable));
+  if (known) {
+    cursor.setAttribute('aria-valuemax', total);
+    cursor.setAttribute('aria-valuenow', elapsed);
+    cursor.setAttribute('aria-valuetext', `${clock(elapsed)} of ${clock(total)}`);
+  }
 }
 
 function tickProgress(refs) {
@@ -339,6 +358,19 @@ function seekable(refs) {
   };
   line.addEventListener('pointerup', stop);
   line.addEventListener('pointercancel', stop);
+
+  // The arrow keys, and VoiceOver's swipe up and down on a slider, move the
+  // cursor a step at a time, each one its own seek.
+  el('[data-role="progress-cursor"]', progress).addEventListener('keydown', (event) => {
+    const direction = ARROWS[event.key];
+    if (!direction || seeking(refs) || !refs.shown || !progress.classList.contains('seekable')) return;
+    event.preventDefault();
+    const { duration_ms: duration } = refs.shown;
+    const ms = refs.shownMs + direction * SEEK_KEY_MS;
+    refs.seek = { ms: Math.round(Math.max(0, Math.min(duration, ms))), stage: 'drag', song: refs.shown.song };
+    renderProgress(refs.shown, refs);
+    sendSeek(refs);
+  });
 }
 
 /* A seek that fails snaps the cursor back; one that works holds it where it
@@ -452,6 +484,11 @@ function holdable(node, action) {
   let timer = null;
   let delay = 420;
 
+  // A press by pointer acts on pointerdown and preventDefault()s, so the
+  // click behind it is not meant to act again. One with no pointer press
+  // just before it -- Enter or Space on a focused button, VoiceOver's
+  // double-tap -- is the only way in for those, and acts once.
+  let pressed = false;
   const stop = () => { clearTimeout(timer); timer = null; delay = 420; };
   const tick = () => {
     action();
@@ -462,10 +499,15 @@ function holdable(node, action) {
   node.addEventListener('pointerdown', (event) => {
     if (event.button > 0 || node.disabled) return;
     event.preventDefault();   // also suppresses the click that would double-fire
+    pressed = true;
     action();
     timer = setTimeout(tick, delay);
   });
   ['pointerup', 'pointercancel', 'pointerleave'].forEach((type) => node.addEventListener(type, stop));
+  ['pointerup', 'pointercancel'].forEach((type) => node.addEventListener(type, () => setTimeout(() => { pressed = false; }, 500)));
+  node.addEventListener('click', () => {
+    if (!pressed && !node.disabled) action();
+  });
 }
 
 function nextLevel(current, direction) {
@@ -552,6 +594,14 @@ function draggable(room) {
   };
   knob.addEventListener('pointerup', stop);
   knob.addEventListener('pointercancel', stop);
+
+  // The arrow keys, and VoiceOver's swipe up and down on a slider.
+  knob.addEventListener('keydown', (event) => {
+    const direction = ARROWS[event.key];
+    if (!direction) return;
+    event.preventDefault();
+    nudge(room.key, direction);
+  });
 }
 
 async function setGrouped(key, joined) {
@@ -733,9 +783,19 @@ function openSheet() {
     ui.options.appendChild(option);
   });
   ui.sheet.hidden = false;
+  // Into the sheet, on the input already selected, so a keyboard or VoiceOver
+  // starts there rather than on the page behind it.
+  (el('[aria-current="true"]', ui.options) || ui.options.firstElementChild).focus();
 }
 
-function closeSheet() { ui.sheet.hidden = true; }
+function closeSheet() {
+  ui.sheet.hidden = true;
+  ui.inputButton.focus();
+}
+
+document.addEventListener('keydown', (event) => {
+  if (event.key === 'Escape' && sheetOpen()) closeSheet();
+});
 
 async function chooseInput(source) {
   closeSheet();

static/panel.css

@@ -1,35 +1,81 @@
 /* Base Theme */
 
 :root {
-  color-scheme: dark;
-  --accent: #5b8def;
+  color-scheme: light dark;
+
+  /* Light is the base, and follows the iOS grouped style: a gray page, white
+     cards on it. Every text pair here clears 4.5:1. */
+  --accent: #356fd9;          /* white on it is 4.7:1, so it can carry text */
+  --bg: #e9eaf0;
+  --card: #fff;
+  --edge: #d1d1d6;
+  --ink: #1c1c1e;
+  --ink-bright: #fff;         /* what sits on the accent, in either theme */
+  --lift: 0 1px 2px var(--shadow), 0 2px 8px -2px var(--shadow);   /* soft and low, so a button rises without an edge */
+  --muted: #58585d;
+  --outline: #8a8f9c;         /* a border that has to be seen, 3:1 */
+  --playing: #c4eed7;         /* the green a playing card fades in from */
+  --radius-lg: 16px;
+  --radius-xl: 28px;
+  --raised: #e3e5ec;
+  --scrim: rgba(0, 0, 0, .35);
+  --shadow: rgba(0, 0, 0, .18);
+  --shade: rgba(0, 0, 0, .06);
+  --space-xs: 4px;
+  --space-sm: 8px;
+  --space-md: 12px;
+  --space-lg: 16px;
+  --space-xl: 24px;
+  /* Rems off the root, written as px / 17 (see html below) so they scale
+     with Dynamic Type; md is the body size. */
+  --text-2xs: calc(11rem / 17);
+  --text-xs: calc(13rem / 17);
+  --text-sm: calc(15rem / 17);
+  --text-md: calc(17rem / 17);
+  --text-lg: calc(20rem / 17);
+  --text-xl: calc(24rem / 17);
+  --toast-bad-bg: #fde8e6;
+  --toast-bad-edge: #f3b8b2;
+  --toast-bad-ink: #7a1a12;
+  --toast-ok-bg: #e4f6ec;
+  --toast-ok-edge: #a8dcc0;
+  --toast-ok-ink: #14532d;
+  --track: #b6bbc8;           /* the empty part of the volume meter */
+  --warn: #c4231b;
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
     --bg: #0a0d14;
     --card: #151a25;
     --edge: #232b3b;
     --ink: #eef2f9;
-  --ink-bright: #fff;
-  --ink-bright-muted: rgba(255, 255, 255, .8);
-  --live: #3ddc97;
-  --media: #1a3333;
-  --muted: #8d98ad;
-  --radius-lg: 16px;
-  --radius-xl: 22px;
+    --muted: #98a3b8;
+    --outline: #5f6b87;
+    --playing: #1f4a42;
     --raised: #29334a;
     --scrim: rgba(4, 6, 11, .6);
     --shadow: rgba(0, 0, 0, .45);
     --shade: rgba(255, 255, 255, .05);
-  --space-xs: 4px;
-  --space-sm: 8px;
-  --space-md: 12px;
-  --space-lg: 24px;
     --toast-bad-bg: #2b1f24;
     --toast-bad-edge: #52303a;
     --toast-bad-ink: #ffd9d4;
     --toast-ok-bg: #172a21;
     --toast-ok-edge: #2a5540;
     --toast-ok-ink: #c9f7df;
+    --track: #3a4660;
     --warn: #ff7a6b;
   }
+}
+
+/* Increase Contrast in iOS' Accessibility settings. */
+@media (prefers-contrast: more) {
+  :root {
+    --muted: var(--ink);
+    --edge: var(--outline);
+    --track: var(--outline);
+  }
+}
 
 * { box-sizing: border-box; }
 
@@ -39,13 +85,18 @@
 
 [hidden] { display: none !important; }
 
-html { background: var(--bg); }
+/* Dynamic Type: on iOS the root takes the size the user chose in Settings
+   (17px at the default), and the --text-* sizes above are rems off it. */
+html { background: var(--bg); font-size: 17px; }
+@supports (font: -apple-system-body) {
+  html { font: -apple-system-body; }
+}
 
 body {
   margin: 0;
   background: var(--bg);
   color: var(--ink);
-  font: 16px/1.4 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
+  font: 1rem/1.4 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
   -webkit-font-smoothing: antialiased;
   -webkit-tap-highlight-color: transparent;
   -webkit-touch-callout: none;
@@ -60,24 +111,28 @@ button {
   background: none;
   cursor: pointer;
   touch-action: manipulation;
-  box-shadow: 1px 1px 1px 0px var(--shadow);
+  box-shadow: var(--lift);
 }
 button:active { transform: scale(.96); }
+button[aria-pressed="true"], button[aria-current="true"] { box-shadow: none; }
+
+/* For a keyboard, including the one on an iPad, and VoiceOver's cursor. */
+:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
 
 svg { width: 22px; height: 22px; fill: currentColor; }
 
 .app {
   max-width: 520px;
   margin: 0 auto;
-  padding: max(var(--space-md), env(safe-area-inset-top)) max(var(--space-md), env(safe-area-inset-right))
-           max(var(--space-lg), env(safe-area-inset-bottom)) max(var(--space-md), env(safe-area-inset-left));
+  padding: max(var(--space-lg), env(safe-area-inset-top)) max(var(--space-lg), env(safe-area-inset-right))
+           max(var(--space-xl), env(safe-area-inset-bottom)) max(var(--space-lg), env(safe-area-inset-left));
   display: flex;
   flex-direction: column;
   gap: var(--space-md);
 }
 
-.wide { width: 100%; height: 50px; border-radius: var(--radius-lg); font-size: 15px; }
-.ghost { background: transparent; border: 1px solid var(--edge); color: var(--muted); }
+.wide { width: 100%; min-height: 50px; border-radius: var(--radius-lg); font-size: var(--text-sm); }
+.ghost { background: transparent; border: 1px solid var(--outline); color: var(--muted); box-shadow: none; }   /* nothing to lift */
 
 @keyframes spin { to { transform: rotate(360deg); } }
 @keyframes rise { from { transform: translateY(14%); opacity: .4; } }
@@ -86,6 +141,10 @@ svg { width: 22px; height: 22px; fill: currentColor; }
 
 header { order: -2; display: flex; align-items: center; justify-content: center; }
 header .logo { height: 44px; width: auto; display: block; margin: var(--space-xs); }
+/* The mark is drawn white, for a dark page. */
+@media (prefers-color-scheme: light) {
+  header .logo { filter: invert(1); }
+}
 
 /* Card */
 
@@ -100,7 +159,6 @@ header .logo { height: 44px; width: auto; display: block; margin: var(--space-xs
 
 .card {
   background: var(--card);
-  border: 1px solid var(--edge);
   border-radius: var(--radius-xl);
   padding: var(--space-md);
   display: flex;
@@ -109,16 +167,14 @@ header .logo { height: 44px; width: auto; display: block; margin: var(--space-xs
 }
 .card.offline { opacity: .5; }
 .card.room.playing, .card.avr.playing {
-  background: linear-gradient(135deg,
-    color-mix(in srgb, var(--live) 25%, var(--card)) 0%,
-    var(--card) 70%);
+  background: linear-gradient(135deg, var(--playing) 0%, var(--card) 70%);
 }
 
 .card-head { display: flex; align-items: center; justify-content: center; gap: var(--space-md); }
 .card-head h2 {
   display: flex; align-items: center; gap: var(--space-md);
   margin: var(--space-sm); min-width: 0;
-  font-size: 20px; font-weight: 600;
+  font-size: var(--text-lg); font-weight: 600;
 }
 .card-head h2 .room-icon { flex: 0 0 auto; height: 20px; width: auto; fill: currentColor; }
 .card-head h2 .room-label { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@@ -147,8 +203,8 @@ header .logo { height: 44px; width: auto; display: block; margin: var(--space-xs
 .cover.poster { width: 50px; height: 75px; border-radius: 9px; }
 .track { display: flex; flex-direction: column; min-width: 0; }
 .track span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
-.song { font-size: 17px; font-weight: 550; }
-.artist { font-size: 15px; color: var(--muted); }
+.song { font-size: var(--text-md); font-weight: 600; }
+.artist { font-size: var(--text-sm); color: var(--muted); }
 .progress { display: flex; align-items: center; gap: var(--space-md); }
 .progress-line { position: relative; flex: 1; height: 3px; border-radius: 2px; background: var(--muted); }
 .progress-fill {
@@ -168,7 +224,7 @@ header .logo { height: 44px; width: auto; display: block; margin: var(--space-xs
 .progress-time,
 .progress-total {
   display: none;
-  font-size: 12px; line-height: 1; color: var(--muted);
+  font-size: var(--text-xs); line-height: 1; color: var(--muted);
   font-variant-numeric: tabular-nums; white-space: nowrap;
 }
 .progress-time {
@@ -179,13 +235,16 @@ header .logo { height: 44px; width: auto; display: block; margin: var(--space-xs
 }
 .progress-time.elapsed { bottom: 9px; }
 .progress-time.remaining { top: 9px; }
-.progress.known { padding: var(--space-md) 0; }   /* room for the labels above and below the cursor */
+/* Room for the labels above and below the cursor: what they need at 13px,
+   plus whatever a larger Dynamic Type size adds to them. */
+.progress.known { padding: calc(var(--space-md) + max(0px, var(--text-xs) - 13px)) 0; }
 .progress.known .progress-cursor,
 .progress.known .progress-time,
 .progress.known .progress-total { display: block; }
 .progress.seekable .progress-cursor,
 .progress.seekable .progress-time { cursor: grab; touch-action: pan-y; }
-.progress.seekable .progress-cursor::before { content: ''; position: absolute; inset: calc(var(--space-md) * -1); }
+/* The cursor is 7px; this grows what a finger can grab to the 44pt Apple asks for. */
+.progress.seekable .progress-cursor::before { content: ''; position: absolute; inset: -19px; }
 .progress.dragging .progress-cursor,
 .progress.dragging .progress-time { transition: none; cursor: grabbing; }
 .progress.dragging .progress-cursor { background: var(--ink); transform: translateY(-50%) scale(1.6); }
@@ -205,7 +264,7 @@ header .logo { height: 44px; width: auto; display: block; margin: var(--space-xs
 .control-btn svg { width: 20px; height: 20px; }
 .control-btn:disabled { opacity: .5; }
 
-.meter { position: relative; flex: 1; height: 8px; border-radius: 4px; background: var(--bg); }
+.meter { position: relative; flex: 1; height: 8px; border-radius: 4px; background: var(--track); }
 .meter i {
   display: block; height: 100%; width: calc(var(--level, 0) * 1%);
   border-radius: 999px; background: var(--accent);
@@ -220,8 +279,10 @@ header .logo { height: 44px; width: auto; display: block; margin: var(--space-xs
   display: grid; place-items: center;
   border-radius: 999px;
   background: var(--accent); color: var(--ink-bright);
-  box-shadow: 0 0 0 3px var(--card);
-  font-size: 14px; font-weight: 640; font-variant-numeric: tabular-nums;
+  box-shadow: 0 1px 4px var(--shadow);
+  /* Left in px: the number has to fit a pill whose size the meter's maths
+     (see the left: above) knows. */
+  font-size: 14px; font-weight: 600; font-variant-numeric: tabular-nums;
   transition: left .12s ease-out;
   cursor: grab;
   touch-action: none;   /* the drag is ours, not a page scroll */
@@ -248,13 +309,13 @@ header .logo { height: 44px; width: auto; display: block; margin: var(--space-xs
 .sources { display: flex; gap: var(--space-md); }
 .sources-btn {
   flex: 1; min-width: 0;
-  height: 50px; border-radius: var(--radius-lg);
+  min-height: 50px; border-radius: var(--radius-lg);
   background: var(--raised);
   display: flex; align-items: center; justify-content: center; gap: var(--space-sm);
-  font-size: 15px; font-weight: 550;
+  font-size: var(--text-sm); font-weight: 600;
 }
 .sources-btn:disabled { opacity: .5; }
-.sources-btn svg { flex: 0 0 auto; color: var(--ink-bright); }
+.sources-btn svg { flex: 0 0 auto; }
 .sources-btn span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
 .sources-btn .spinner { display: none; }
 button.sources-btn.loading .icon { display: none; }
@@ -277,9 +338,9 @@ button.sources-btn.loading .icon { display: none; }
   background: var(--raised);
   text-align: left;
 }
-.input-select .eyebrow { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
+.input-select .eyebrow { font-size: var(--text-2xs); text-transform: uppercase; letter-spacing: .08em; color: var(--muted); }
 .input-select [data-role="input-icon"] { flex: 0 0 auto; height: 18px; width: 18px; fill: currentColor; color: var(--muted); }
-.input-select .value { flex: 1; font-size: 19px; font-weight: 600; }
+.input-select .value { flex: 1; font-size: var(--text-lg); font-weight: 600; }
 .input-select .chevron { color: var(--muted); }
 
 .sheet-wrap { position: fixed; inset: 0; z-index: 10; display: flex; flex-direction: column; justify-content: flex-end; }
@@ -289,46 +350,46 @@ button.sources-btn.loading .icon { display: none; }
   position: relative;
   background: var(--card);
   border: 1px solid var(--edge);
-  border-radius: 28px 28px 0 0;
+  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
   padding: var(--space-md) var(--space-md) calc(var(--space-md) + env(safe-area-inset-bottom));
   max-height: 82vh;
   display: flex; flex-direction: column; gap: var(--space-md);
   animation: rise .22s cubic-bezier(.22, .68, .3, 1);
 }
 
-.grabber { width: 38px; height: 4px; border-radius: 999px; background: var(--edge); margin: var(--space-xs) auto var(--space-xs); }
-.sheet h3 { margin: 0 var(--space-xs); font-size: 14px; font-weight: 600; color: var(--muted); }
+.grabber { width: 38px; height: 4px; border-radius: 999px; background: var(--outline); margin: var(--space-xs) auto var(--space-xs); }
+.sheet h3 { margin: 0 var(--space-xs); font-size: var(--text-xs); font-weight: 600; color: var(--muted); }
 
 .options { display: flex; flex-direction: column; gap: var(--space-sm); overflow-y: auto; -webkit-overflow-scrolling: touch; }
 .option {
   display: flex; align-items: center; justify-content: space-between; gap: var(--space-md);
   min-height: 58px; padding: 0 var(--space-md);
   border-radius: var(--radius-lg); background: var(--raised);
-  font-size: 17px; text-align: left;
+  font-size: var(--text-md); text-align: left;
 }
 .option[aria-current="true"] { background: var(--accent); color: var(--ink-bright); }
 .option-label { display: flex; align-items: center; gap: var(--space-md); min-width: 0; overflow: hidden; }
 .option-label svg { flex: 0 0 auto; height: 18px; width: 18px; fill: currentColor; color: var(--muted); }
 .option-label span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
-.option[aria-current="true"] .option-label svg { color: var(--ink-bright-muted); }
-.option .code { font-size: 12px; color: var(--muted); flex: 0 0 auto; }
-.option[aria-current="true"] .code { color: var(--ink-bright-muted); }
+.option[aria-current="true"] .option-label svg { color: var(--ink-bright); }
+.option .code { font-size: var(--text-xs); color: var(--muted); flex: 0 0 auto; }
+.option[aria-current="true"] .code { color: var(--ink-bright); }
 
 /* AVR - Grouped Room */
 
 .joined { display: flex; flex-direction: column; gap: var(--space-md); }
-.joined .card.room { background: none; border-color: var(--ink); border-radius: 18px; padding: var(--space-md); gap: var(--space-md); }
-.joined .card-head h2 { font-size: 15px; font-weight: 550; color: var(--muted); }
+.joined .card.room { background: none; border-color: var(--ink); border-radius: var(--radius-lg); padding: var(--space-md); gap: var(--space-md); }
+.joined .card-head h2 { font-size: var(--text-sm); font-weight: 600; color: var(--muted); }
 .joined .cover { width: 52px; height: 52px; border-radius: 10px; }
-.joined .song { font-size: 18px; }
+.joined .song { font-size: var(--text-md); }
 .joined .step { height: 54px; }
-.joined .toggle[aria-pressed="true"] { background: var(--raised); color: inherit; }
+.joined .toggle[aria-pressed="true"] { background: var(--raised); color: inherit; box-shadow: var(--lift); }   /* an action here, not a state */
 .joined .toggle .cinema { display: none; }
 .joined .toggle .leave { display: block; }
 
 /* Footer */
 
-footer { margin: var(--space-xs) var(--space-xs) 0; min-height: 18px; font-size: 12px; color: var(--muted); text-align: center; }
+footer { margin: var(--space-xs) var(--space-xs) 0; min-height: 18px; font-size: var(--text-xs); color: var(--muted); text-align: center; }
 footer.bad { color: var(--warn); }
 
 /* Toast */
@@ -339,6 +400,6 @@ footer.bad { color: var(--warn); }
   z-index: 20; max-width: 90vw;
   padding: var(--space-md) var(--space-md); border-radius: 14px;
   background: var(--toast-bad-bg); border: 1px solid var(--toast-bad-edge); color: var(--toast-bad-ink);
-  font-size: 14px; box-shadow: 0 10px 30px var(--shadow);
+  font-size: var(--text-sm); box-shadow: 0 10px 30px var(--shadow);
 }
 .toast.ok { background: var(--toast-ok-bg); border-color: var(--toast-ok-edge); color: var(--toast-ok-ink); }

templates/index.html

@@ -3,15 +3,17 @@
 
 <head>
   <meta charset="utf-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover, user-scalable=no">
+  <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
   <title>{{ app_name }}</title>
 
   <!-- Added to the iOS home screen, this opens full-screen with no browser chrome. -->
   <meta name="apple-mobile-web-app-capable" content="yes">
   <meta name="mobile-web-app-capable" content="yes">
-  <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
+  <meta name="apple-mobile-web-app-status-bar-style" content="default">
   <meta name="apple-mobile-web-app-title" content="{{ app_name }}">
-  <meta name="theme-color" content="#0a0d14">
+  <meta name="color-scheme" content="light dark">
+  <meta name="theme-color" content="#e9eaf0" media="(prefers-color-scheme: light)">
+  <meta name="theme-color" content="#0a0d14" media="(prefers-color-scheme: dark)">
 
   <link rel="manifest" href="{{ url_for('manifest') }}">
   <link rel="apple-touch-icon" href="{{ url_for('static', filename='icon-180.png') }}">
@@ -75,7 +77,7 @@
     <div class="progress" data-role="progress">
       <div class="progress-line">
         <i data-role="progress-fill"></i>
-        <b class="progress-cursor" data-role="progress-cursor"></b>
+        <b class="progress-cursor" data-role="progress-cursor" role="slider" aria-label="Playback position" aria-valuemin="0"></b>
         <span class="progress-time elapsed" data-role="progress-elapsed"></span>
         <span class="progress-time remaining" data-role="progress-remaining"></span>
       </div>
@@ -87,7 +89,7 @@
     <button class="control-btn step" data-delta="-1" aria-label="{{ room.label }}: volume down">
       <svg viewBox="0 0 448 512" aria-hidden="true"><path d="M432 256c0 17.7-14.3 32-32 32L48 288c-17.7 0-32-14.3-32-32s14.3-32 32-32l352 0c17.7 0 32 14.3 32 32z"/></svg>
     </button>
-    <div class="meter" data-role="meter"><i></i><b class="knob" data-role="level">—</b></div>
+    <div class="meter" data-role="meter"><i></i><b class="knob" data-role="level" role="slider" tabindex="0" aria-label="{{ room.label }}: volume" aria-valuemin="0" aria-valuemax="100">—</b></div>
     <button class="control-btn step" data-delta="1" aria-label="{{ room.label }}: volume up">
       <svg viewBox="0 0 448 512" aria-hidden="true"><path d="M256 80c0-17.7-14.3-32-32-32s-32 14.3-32 32l0 144L48 224c-17.7 0-32 14.3-32 32s14.3 32 32 32l144 0 0 144c0 17.7 14.3 32 32 32s32-14.3 32-32l0-144 144 0c17.7 0 32-14.3 32-32s-14.3-32-32-32l-144 0 0-144z"/></svg>
     </button>
@@ -145,7 +147,7 @@
   </div>
 </div>
 
-<div class="toast" data-role="toast" hidden></div>
+<div class="toast" data-role="toast" role="status" hidden></div>
 
 <script src="{{ url_for('static', filename='app.js') }}"></script>
 </body>