Task Center Bottom Action Panel
In the task center scenario, complete a bottom action sheet: includes real content, actionable controls, clear status feedback, and cross-size layout.
With JavaScript enabled, you can edit, run, and save this example. The fixed source is as follows:
<!doctype html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Task Center Bottom Action Panel</title>
<style>
:root { --ink:#3a2419; --paper:#fbf3df; --accent:#c66a2d; --secondary:#b5c88d; --line:color-mix(in srgb, var(--ink) 18%, transparent); --shadow:0 24px 60px color-mix(in srgb, var(--ink) 16%, transparent); color-scheme:light; }
* { box-sizing:border-box; }
html { min-width:320px; background:var(--paper); }
body { min-height:100vh; margin:0; overflow-x:hidden; color:var(--ink); font-family:"Hiragino Maru Gothic ProN","PingFang SC",sans-serif; background:radial-gradient(circle at 15% 10%,color-mix(in srgb,var(--secondary) 35%,transparent) 0 9%,transparent 10%),radial-gradient(circle at 90% 75%,color-mix(in srgb,var(--accent) 18%,transparent) 0 12%,transparent 13%),var(--paper); }
button,input,select,textarea { color:inherit; font:inherit; }
button,[role="button"],input,select,textarea { accent-color:var(--accent); }
button { cursor:pointer; }
button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible { outline:3px solid var(--accent); outline-offset:3px; }
[hidden] { display:none !important; }
@media (max-width:700px) { .mast h1 { line-height:1.08 !important; letter-spacing:-.035em !important; overflow-wrap:anywhere; } }
@media (prefers-reduced-motion:reduce) { *,*::before,*::after { scroll-behavior:auto !important; animation-duration:.01ms !important; animation-iteration-count:1 !important; transition-duration:.01ms !important; } }
.page{width:min(1140px,calc(100% - 28px));margin:auto;padding:54px 0}.mast{display:flex;justify-content:space-between;align-items:center;gap:24px;margin:0 12px 28px}.mast h1{font-family:"Hiragino Maru Gothic ProN","PingFang SC",sans-serif;font-weight:900;font-size:clamp(38px,8vw,82px);letter-spacing:-.035em;margin:0;line-height:.98}.eyebrow{display:inline-flex;padding:7px 12px;border-radius:999px;color:var(--paper);background:var(--accent);font-weight:900}.intro{max-width:620px;line-height:1.65}.scenario{padding:12px 18px;border-radius:999px;background:var(--secondary);box-shadow:0 7px 0 color-mix(in srgb,var(--ink) 18%,transparent);font-weight:900}.demo{border-radius:46px 18px 46px 18px;box-shadow:0 18px 0 color-mix(in srgb,var(--secondary) 45%,transparent);position:relative;min-height:390px;overflow:hidden;padding:clamp(22px,5vw,54px);background:color-mix(in srgb,var(--paper) 90%,#fff)}@media(max-width:700px){.mast{display:grid}.page{width:calc(100% - 16px);padding:18px 0}.demo{padding:17px}}
.panel{padding:26px;border:1px solid var(--line);border-radius:2px;background:var(--paper)}.stack{display:grid;gap:28px}.row{display:flex;gap:20px;flex-wrap:wrap}.action{padding:9px 2px;border:0;border-bottom:2px solid var(--line);background:transparent}.action.primary,.action.is-active{border-color:var(--accent);color:var(--accent)}.muted{font-size:14px;line-height:1.9}.status{min-height:20px;margin-top:28px;font-size:13px}.metric{font-size:clamp(40px,9vw,88px);font-weight:500;letter-spacing:-.06em}.meter{height:2px;background:var(--line)}.meter>i{display:block;height:100%;background:var(--accent)}.chip{font-size:11px;letter-spacing:.12em;text-transform:uppercase}
.composition-split{display:grid;grid-template-columns:150px minmax(0,1fr);gap:18px;align-items:start}.split-note{position:sticky;top:20px;display:grid;gap:14px;padding:18px 12px;border-block:3px double var(--accent);font-size:13px;line-height:1.65}.split-note b{font:900 12px/1 ui-monospace,monospace;letter-spacing:.12em}.split-note span{writing-mode:vertical-rl;min-height:120px;color:color-mix(in srgb,var(--ink) 60%,transparent)}.composition-split .demo{min-width:0}@media(max-width:900px){.composition-split{grid-template-columns:1fr}.split-note{position:static;grid-template-columns:auto 1fr}.split-note span{writing-mode:horizontal-tb;min-height:0}}
.phone-preview{display:grid;grid-template-rows:auto 1fr auto;min-height:420px;max-width:640px;margin:auto;overflow:hidden;border:1px solid var(--line);border-radius:32px;background:var(--paper);box-shadow:var(--shadow)}.phone-preview>header,.phone-preview>footer{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:16px 20px;border-bottom:1px solid var(--line);font-weight:900}.phone-preview>header button{width:44px;height:40px;border:1px solid var(--line);border-radius:999px;background:transparent}.phone-preview>main{display:grid;align-content:center;padding:clamp(28px,7vw,70px)}.phone-preview h2{margin:.2em 0;font-size:clamp(38px,8vw,78px)}.phone-preview>footer{justify-content:flex-end;border-top:1px solid var(--line);border-bottom:0}.phone-preview>footer button{padding:10px 15px;border:1px solid var(--line);border-radius:9px;background:transparent}.mobile-sheet-demo dialog{width:min(620px,calc(100% - 16px));max-height:calc(100dvh - 16px);margin:auto auto 8px;padding:0;border:0;border-radius:28px 28px 18px 18px;color:var(--ink);background:var(--paper);box-shadow:0 -25px 80px #0005}.mobile-sheet-demo dialog::backdrop{background:#1119}.mobile-sheet-demo form{display:grid;gap:12px;padding:10px 18px 18px}.sheet-handle{width:62px;height:5px;margin:2px auto 4px;border-radius:999px;background:var(--line)}.mobile-sheet-demo dialog header{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:8px}.mobile-sheet-demo dialog h2{margin:.2em 0}.mobile-sheet-demo dialog header>button{width:42px;height:42px;border:0;border-radius:50%;background:var(--line);font-size:22px}.sheet-actions{display:grid;overflow:hidden;border:1px solid var(--line);border-radius:16px}.sheet-actions>button{display:grid;grid-template-columns:42px 1fr auto;gap:12px;align-items:center;padding:15px;border:0;background:transparent;text-align:left}.sheet-actions>button+button{border-top:1px solid var(--line)}.sheet-actions>button>span:first-child{display:grid;width:42px;height:42px;place-items:center;border-radius:12px;background:color-mix(in srgb,var(--secondary) 18%,transparent);font-size:22px}.sheet-actions small{display:block;margin-top:4px;opacity:.62}.sheet-actions i{font-size:25px}.sheet-cancel{padding:13px;border:0;border-radius:14px;background:color-mix(in srgb,var(--ink) 8%,transparent);font-weight:900}.workflow-session{display:grid;gap:14px}.session-command{display:grid;grid-template-columns:1fr auto minmax(170px,.45fr) auto;gap:16px;align-items:end;padding:18px;border-block:4px double var(--ink)}.session-command h2{margin:.2em 0}.session-command output{font:900 clamp(28px,5vw,54px)/1 ui-monospace,monospace}.session-command label{display:grid;grid-template-columns:1fr auto;gap:7px;font-size:12px}.session-command input{grid-column:1/-1;width:100%}#workflowSessionProgress{height:12px;overflow:hidden;border-radius:2px;background:var(--line)}#workflowSessionProgress i{display:block;width:0;height:100%;background:var(--accent)}.session-stage{min-width:0;transition:filter .25s,transform .25s}.session-stage[data-session-phase="running"]{transform:translateY(-3px)}.session-stage[data-session-phase="paused"]{filter:grayscale(.65)}.session-stage[data-session-phase="complete"]{filter:contrast(.78);opacity:.72}.session-log{display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:start}.session-log ol{display:flex;flex-wrap:wrap;gap:7px;padding:0;margin:0;list-style:none}.session-log li{padding:5px 8px;border:1px solid var(--line);font-size:12px}@media(max-width:900px){.session-stage{order:-1}.session-command{grid-template-columns:1fr auto}.session-command label{grid-column:1/-1}.session-log{grid-template-columns:1fr}}
</style>
</head>
<body data-aesthetic="playful" data-composition="split-note">
<main class="page">
<header class="mast"><div><span class="eyebrow">playful / Bottom Action Sheet / INTERMEDIATE</span><h1>Task Center Bottom Action Panel</h1><p class="intro">In the task center scenario, complete a bottom action sheet: includes real content, actionable controls, clear status feedback, and cross-size layout.</p></div><span class="scenario">Task Center</span></header>
<div class="composition-split"><aside class="split-note"><b>CASE 02</b><span>Master the semantic structure, responsive arrangement, keyboard operation, and state synchronization of a bottom action sheet.</span></aside><section class="demo" aria-label="Interaction area of the bottom action panel in the task center"><div class="workflow-session"><header class="session-command"><div><span class="eyebrow">Task Center SESSION</span><h2>Task time slot timer</h2></div><output id="workflowSessionClock">00:45</output><label>Round Duration<input id="workflowSessionLength" type="range" min="15" max="90" step="15" value="45"><span>sec</span></label><button id="workflowSessionToggle" class="action primary" type="button">Start task</button></header><div id="workflowSessionProgress" role="progressbar" aria-label="Task Time Progress" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0"><i></i></div><section id="workflowCore" class="workflow-core session-stage" data-session-phase="ready" tabindex="-1"><!-- 11DZ_CORE_START:overlays-feedback-mobile-sheet --><section class="mobile-sheet-demo"><div class="phone-preview"><header><span>Task Center</span><button id="mobileSheetOpen" type="button" aria-haspopup="dialog" data-core-bridge="overlays-feedback-mobile-sheet">•••<span class="visually-hidden">Open more actions</span></button></header><main><span class="eyebrow">MOBILE SHEET</span><h2>Task Center Records</h2><p>The bottom action panel sits near the thumb reach zone while keeping centered content width on desktop.</p></main><footer><button type="button">Back</button><button type="button">Continue</button></footer></div><dialog id="mobileSheet" aria-labelledby="mobileSheetTitle"><form method="dialog"><div class="sheet-handle" aria-hidden="true"></div><header><div><span class="eyebrow">MORE ACTIONS</span><h2 id="mobileSheetTitle">Choose next step</h2></div><button value="cancel" aria-label="Close bottom action panel">×</button></header><div class="sheet-actions"><button value="Add to favorites"><span aria-hidden="true">☆</span><span><strong>Add to favorites</strong><small>Task Center Collaboration</small></span><i aria-hidden="true">›</i></button><button value="Share link"><span aria-hidden="true">↗</span><span><strong>Share link</strong><small>Task Center Progress</small></span><i aria-hidden="true">›</i></button><button value="Save a copy"><span aria-hidden="true">□</span><span><strong>Save a copy</strong><small>Task Center Reminder</small></span><i aria-hidden="true">›</i></button></div><button class="sheet-cancel" value="cancel">Cancel</button></form></dialog></section><!-- 11DZ_CORE_END --></section><footer class="session-log"><strong id="workflowSessionScore">0 interaction checkpoints</strong><ol id="workflowSessionLaps" aria-label="Round Log"></ol></footer></div><p id="status" class="status" role="status" aria-live="polite"></p></section></div>
</main>
<script>
'use strict';
const statusOutput = document.querySelector('#status');
const announce = message => { statusOutput.textContent = message; };
/* 11DZ_CORE_SCRIPT_START:overlays-feedback-mobile-sheet */
const mobileSheet=document.querySelector('#mobileSheet');document.querySelector('#mobileSheetOpen').addEventListener('click',()=>{mobileSheet.returnValue='cancel';mobileSheet.showModal();});mobileSheet.addEventListener('click',event=>{if(event.target===mobileSheet)mobileSheet.close('cancel');});mobileSheet.addEventListener('close',()=>announce(mobileSheet.returnValue==='cancel'?'Bottom action sheet closed':'Selected '+mobileSheet.returnValue));
/* 11DZ_CORE_SCRIPT_END */
const workflowBridgeSpec={"name":"overlays-feedback-mobile-sheet","selector":"[data-core-bridge=\"overlays-feedback-mobile-sheet\"]","mode":"click","key":"Enter"};const workflowBridgeCore=document.querySelector('#workflowCore');const workflowBridgeControl=workflowBridgeCore.querySelector(workflowBridgeSpec.selector);if(!workflowBridgeControl)throw new Error('Missing core bridge: '+workflowBridgeSpec.name);const workflowBridgeControlledId=workflowBridgeControl.getAttribute('aria-controls');const workflowBridgeControlled=workflowBridgeControlledId?document.getElementById(workflowBridgeControlledId):null;workflowBridgeCore.dataset.workflowBridge=workflowBridgeSpec.name;workflowBridgeCore.dataset.workflowVersion='0';function workflowBridgeSerialize(){const visualNode=workflowBridgeCore.firstElementChild||workflowBridgeCore;const visual=getComputedStyle(visualNode);const outputs=[...workflowBridgeCore.querySelectorAll('output,[role="status"],[aria-live],meter,progress')].map(node=>node.textContent.trim()+'|'+node.getAttribute('aria-valuenow')+'|'+node.getAttribute('value'));const canvas=[...workflowBridgeCore.querySelectorAll('canvas')].map(node=>{try{return node.toDataURL().slice(-160);}catch{return 'canvas-unavailable';}});return JSON.stringify({html:workflowBridgeCore.innerHTML,status:statusOutput.textContent,outputs,canvas,visual:[visual.display,visual.visibility,visual.opacity,visual.transform,visual.filter,visual.backgroundColor,visual.width,visual.height],scroll:workflowBridgeSpec.mode==='scroll'?workflowBridgeControl.scrollTop:null});}let workflowBridgeLastEffect=workflowBridgeSerialize();function workflowBridgeSummary(){const label=(workflowBridgeControl.getAttribute('aria-label')||workflowBridgeControl.textContent||workflowBridgeControl.value||workflowBridgeSpec.name).trim().replace(/\s+/g,' ').slice(0,72);return label+' · Core Version '+workflowBridgeCore.dataset.workflowVersion;}function workflowBridgeCommit(){const effect=workflowBridgeSerialize();if(effect===workflowBridgeLastEffect)return {changed:false,summary:workflowBridgeSummary()};workflowBridgeLastEffect=effect;workflowBridgeCore.dataset.workflowVersion=String(Number(workflowBridgeCore.dataset.workflowVersion||0)+1);return {changed:true,summary:workflowBridgeSummary()};}function workflowBridgeScheduleCommit(){queueMicrotask(workflowBridgeCommit);setTimeout(workflowBridgeCommit,0);}workflowBridgeControl.addEventListener("click",workflowBridgeScheduleCommit);const workflowBridgeStateTargets=new Set(workflowBridgeCore.querySelectorAll('dialog'));if(workflowBridgeControlled&&workflowBridgeCore.contains(workflowBridgeControlled))workflowBridgeStateTargets.add(workflowBridgeControlled);workflowBridgeStateTargets.forEach(target=>['close','cancel','toggle'].forEach(eventName=>target.addEventListener(eventName,workflowBridgeScheduleCommit)));function workflowBridgeActivate(){workflowBridgeControl.focus();workflowBridgeControl.click();const result=workflowBridgeCommit();setTimeout(workflowBridgeCommit,0);return result;}function workflowBridgeReset(){workflowBridgeCore.dataset.workflowVersion='0';workflowBridgeLastEffect=workflowBridgeSerialize();}
const workflowSessionCore=document.querySelector('#workflowCore');const workflowSessionToggle=document.querySelector('#workflowSessionToggle');const workflowSessionLength=document.querySelector('#workflowSessionLength');const workflowSessionState={phase:'ready',elapsed:0,limit:Number(workflowSessionLength.value),checkpoints:[],timer:null};function workflowSessionFormat(seconds){return String(Math.floor(seconds/60)).padStart(2,'0')+':'+String(seconds%60).padStart(2,'0');}function workflowSessionDrive(){const percent=Math.min(100,Math.round(workflowSessionState.elapsed/workflowSessionState.limit*100));document.querySelector('#workflowSessionClock').textContent=workflowSessionFormat(Math.max(0,workflowSessionState.limit-workflowSessionState.elapsed));const progress=document.querySelector('#workflowSessionProgress');progress.setAttribute('aria-valuenow',String(percent));progress.querySelector('i').style.width=percent+'%';workflowSessionCore.dataset.sessionPhase=workflowSessionState.phase;document.querySelector('#workflowSessionScore').textContent=workflowSessionState.checkpoints.length+' interactive checkpoints';}function workflowSessionLap(label){workflowSessionState.checkpoints.push({label,at:workflowSessionState.elapsed});const item=document.createElement('li');item.textContent=label+' · '+workflowSessionFormat(workflowSessionState.elapsed);document.querySelector('#workflowSessionLaps').append(item);workflowSessionDrive();}function workflowSessionStop(complete=false){clearInterval(workflowSessionState.timer);workflowSessionState.timer=null;workflowSessionState.phase=complete?'complete':'paused';workflowSessionToggle.textContent=complete?'Restart':'Continue round';workflowSessionToggle.setAttribute('aria-pressed','false');workflowSessionDrive();announce(complete?'Task Shift Complete':'Round paused');}function workflowSessionStart(){if(workflowSessionState.phase==='complete'){workflowSessionState.elapsed=0;workflowSessionState.checkpoints=[];document.querySelector('#workflowSessionLaps').replaceChildren();}workflowSessionState.phase='running';workflowSessionToggle.textContent='Pause round';workflowSessionToggle.setAttribute('aria-pressed','true');const bridge=workflowBridgeActivate();workflowSessionLap(bridge.summary);clearInterval(workflowSessionState.timer);workflowSessionState.timer=setInterval(()=>{workflowSessionState.elapsed+=1;if(workflowSessionState.elapsed>=workflowSessionState.limit){workflowSessionStop(true);return;}workflowSessionDrive();},1000);workflowSessionDrive();announce('The task period round has started · '+bridge.summary);}workflowSessionToggle.addEventListener('click',()=>workflowSessionState.phase==='running'?workflowSessionStop():workflowSessionStart());workflowSessionLength.addEventListener('input',()=>{workflowSessionState.limit=Number(workflowSessionLength.value);workflowSessionState.elapsed=Math.min(workflowSessionState.elapsed,workflowSessionState.limit);workflowSessionDrive();});workflowSessionCore.addEventListener('keydown',event=>{if(event.key==='Enter'||event.key===' '){workflowSessionLap('Keyboard Interaction');}});workflowSessionCore.addEventListener('click',event=>{if(event.target.closest('[data-core-bridge]'))workflowSessionLap('Core action · '+workflowBridgeSummary());});document.addEventListener('visibilitychange',()=>{if(document.hidden&&workflowSessionState.phase==='running')workflowSessionStop();});workflowSessionDrive();
workflowBridgeReset();
</script>
</body>
</html>