Task Center Help Popover
Build a help popover for a task center scenario: includes real content, actionable controls, clear status feedback, and responsive layouts.
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<title>Task Center Help Popover</title>
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<main class="page">
<header class="mast"><div><span class="eyebrow">paper / Help Popover / INTERMEDIATE</span><h1>Task Center Help Popover</h1><p class="intro">Build a help popover for a task center scenario: includes real content, actionable controls, clear status feedback, and responsive layouts.</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 interaction, and state synchronization of help overlays.</span></aside><section class="demo" aria-label="Task Center help popover 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-help-popover --><section class="help-popover-demo"><div class="help-document"><span class="eyebrow">HELP POPOVER</span><h2>Task Center settings help</h2><p>Help content opens in place from the trigger button without interrupting the current task.</p><div class="help-setting"><div><strong>Task Center Overview</strong><small>Keep the most recent configuration</small></div><button id="helpPopoverTrigger" type="button" aria-expanded="false" aria-controls="helpPopover" data-core-bridge="overlays-feedback-help-popover">What is this?</button><label class="help-toggle"><input type="checkbox" checked aria-label="Enable task center overview"><span aria-hidden="true"></span></label></div></div><div id="helpPopover" class="help-popover" popover role="note"><header><span>QUICK HELP</span><button id="helpPopoverClose" type="button" aria-label="Close Help">×</button></header><h3>Task Center Overview</h3><p>When enabled, preferences are saved only in the current browser and no network requests are made.</p><a href="#help-detail">View full instructions</a></div><aside class="help-tip"><span aria-hidden="true">?</span><p>Supports Popover API; older browsers automatically fall back to a switchable panel.</p></aside></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>
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<script>
'use strict';
const statusOutput = document.querySelector('#status');
const announce = message => { statusOutput.textContent = message; };
/* 11DZ_CORE_SCRIPT_START:overlays-feedback-help-popover */
const helpPopover=document.querySelector('#helpPopover');const helpPopoverTrigger=document.querySelector('#helpPopoverTrigger');const helpPopoverClose=document.querySelector('#helpPopoverClose');const supportsPopover=typeof helpPopover.showPopover==='function';helpPopover.hidden=!supportsPopover;function helpIsOpen(){return supportsPopover?helpPopover.matches(':popover-open'):!helpPopover.hidden;}function setHelpPopover(open){if(supportsPopover){if(open&&!helpIsOpen())helpPopover.showPopover();if(!open&&helpIsOpen())helpPopover.hidePopover();}else helpPopover.hidden=!open;helpPopoverTrigger.setAttribute('aria-expanded',String(open));announce(open?'Help popover expanded':'Help popover closed');}helpPopoverTrigger.addEventListener('click',()=>setHelpPopover(!helpIsOpen()));helpPopoverClose.addEventListener('click',()=>{setHelpPopover(false);helpPopoverTrigger.focus();});helpPopover.addEventListener('toggle',event=>{helpPopoverTrigger.setAttribute('aria-expanded',String(event.newState==='open'));});document.querySelector('.help-popover a').addEventListener('click',event=>{event.preventDefault();announce('Full details located');});document.addEventListener('keydown',event=>{if(event.key==='Escape'&&helpIsOpen()){setHelpPopover(false);helpPopoverTrigger.focus();}});
/* 11DZ_CORE_SCRIPT_END */
const workflowBridgeSpec={"name":"overlays-feedback-help-popover","selector":"[data-core-bridge=\"overlays-feedback-help-popover\"]","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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