Floating layers and status feedback
Task Center Progress Blocker

Complete a progress blocker in a task center scenario: include real content, actionable controls, clear status feedback, and responsive layout across sizes.
Floating layers and status feedbackProgress overlayHTMLCSSJavaScript
With JavaScript enabled, you can edit, run, and save this example. The fixed source is as follows:
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  <title>Task Center Progress Blocker</title>
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<body data-aesthetic="dashboard" data-composition="control-deck">
  <main class="page">
    <header class="mast"><div><span class="eyebrow">dashboard / progress overlay / BEGINNER</span><h1>Task Center Progress Blocker</h1><p class="intro">Complete a progress blocker in a task center scenario: include real content, actionable controls, clear status feedback, and responsive layout across sizes.</p></div><span class="scenario">Task Center</span></header>
    <div class="composition-deck"><div class="deck-bar"><span>CONTROL DECK · 04</span><span>Progress overlay</span><span class="deck-lights" aria-hidden="true"><i></i><i></i><i></i></span></div><section class="demo" aria-label="Task Center progress overlay interactive area"><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-progress-blocker --><section class="progress-blocker-demo"><div class="blocker-stage"><span class="eyebrow">PROGRESS BLOCKER</span><h2>Task Center Task Handling</h2><p>Show modal progress only after it has been explicitly started; users can cancel at any time.</p><button id="blockerStart" class="action primary" type="button" data-core-bridge="overlays-feedback-progress-blocker">Start processing</button><ul><li>Task Center Records<span>Waiting</span></li><li>Task Center Collaboration<span>Waiting</span></li><li>Task Center Progress<span>Waiting</span></li></ul></div><dialog id="progressBlocker" aria-labelledby="blockerTitle"><div class="blocker-spinner" aria-hidden="true"><i></i></div><span class="eyebrow">PROCESSING</span><h2 id="blockerTitle">Processing locally</h2><p id="blockerMessage">Preparing data…</p><div class="blocker-progress" role="progressbar" aria-label="Processing Progress" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0"><i id="blockerMeter"></i></div><output id="blockerValue">0%</output><button id="blockerCancel" type="button">Cancel Processing</button></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-progress-blocker */
const progressBlocker=document.querySelector('#progressBlocker');const blockerProgress=progressBlocker.querySelector('[role="progressbar"]');const blockerMeter=document.querySelector('#blockerMeter');const blockerValue=document.querySelector('#blockerValue');const blockerMessage=document.querySelector('#blockerMessage');let blockerTimer=0;let blockerCloseTimer=0;let blockerAmount=0;function cancelBlocker(message){clearInterval(blockerTimer);clearTimeout(blockerCloseTimer);blockerTimer=0;blockerCloseTimer=0;if(progressBlocker.open)progressBlocker.close();announce(message);}document.querySelector('#blockerStart').addEventListener('click',()=>{blockerAmount=0;blockerMeter.style.width='0%';blockerValue.textContent='0%';blockerProgress.setAttribute('aria-valuenow','0');blockerMessage.textContent='Preparing data…';progressBlocker.showModal();blockerTimer=setInterval(()=>{blockerAmount=Math.min(100,blockerAmount+10);blockerMeter.style.width=blockerAmount+'%';blockerValue.textContent=blockerAmount+'%';blockerProgress.setAttribute('aria-valuenow',String(blockerAmount));blockerMessage.textContent=blockerAmount<40?'Preparing data…':blockerAmount<80?'App Settings…':'Complete check…';if(blockerAmount===100){clearInterval(blockerTimer);blockerTimer=0;blockerCloseTimer=setTimeout(()=>cancelBlocker('Local processing complete'),350);}},160);});document.querySelector('#blockerCancel').addEventListener('click',()=>cancelBlocker('Processing canceled'));progressBlocker.addEventListener('cancel',event=>{event.preventDefault();cancelBlocker('Processing canceled');});
/* 11DZ_CORE_SCRIPT_END */
const workflowBridgeSpec={"name":"overlays-feedback-progress-blocker","selector":"[data-core-bridge=\"overlays-feedback-progress-blocker\"]","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>
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