Presentation Room Media Query Observer
Complete the media query observer in a presentation space scenario: includes real content, interactive controls, clear state feedback, and responsive layouts across sizes.
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<title>Presentation Room Media Query Observer</title>
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<header class="mast"><div><span class="eyebrow">Magazine / Media Query Observer / INTERMEDIATE</span><h1>Presentation Room Media Query Observer</h1><p class="intro">Complete the media query observer in a presentation space scenario: includes real content, interactive controls, clear state feedback, and responsive layouts across sizes.</p></div><span class="scenario">Demo space</span></header>
<div class="composition-studio"><div class="studio-ruler" aria-hidden="true"></div><section class="demo" aria-label="Interactive area for the presentation space media query observer"><div class="workflow-session"><header class="session-command"><div><span class="eyebrow">Demo Space SESSION</span><h2>Demo Timer Station</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 Presentation</button></header><div id="workflowSessionProgress" role="progressbar" aria-label="Demo timer 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:browser-media-device-media-query --><div class="query-observatory"><header><span class="eyebrow">MEDIA QUERY MATRIX</span><h2>Presentation Space Environment Query Panel</h2><p>Select the conditions to observe; browser changes will update the indicator lights immediately.</p></header><fieldset id="queryFilters"><legend>Viewing Conditions</legend><label><input type="checkbox" value="0" checked data-core-bridge="browser-media-device-media-query"><span>Narrow Screen</span><code>(max-width: 600px)</code><i aria-hidden="true"></i></label><label><input type="checkbox" value="1" checked><span>Portrait</span><code>(orientation: portrait)</code><i aria-hidden="true"></i></label><label><input type="checkbox" value="2" checked><span>Reduce Motion</span><code>(prefers-reduced-motion: reduce)</code><i aria-hidden="true"></i></label><label><input type="checkbox" value="3" checked><span>High Contrast</span><code>(prefers-contrast: more)</code><i aria-hidden="true"></i></label></fieldset><section class="query-preview"><div id="queryShape" aria-hidden="true"></div><output id="querySummary" role="status">Waiting for calculation</output><ul id="queryMatches"></ul><button id="queryReset" class="action" type="button">Observe all</button></section></div><!-- 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:browser-media-device-media-query */
const queryDefinitions=[["Narrow Screen","(max-width: 600px)"],["Portrait","(orientation: portrait)"],["Reduce Motion","(prefers-reduced-motion: reduce)"],["High Contrast","(prefers-contrast: more)"]];const queryRows=[...document.querySelectorAll('#queryFilters label')];const queryInputs=[...document.querySelectorAll('#queryFilters input')];const queryLists=queryDefinitions.map(entry=>matchMedia(entry[1]));function renderQueries(){const enabled=new Set(queryInputs.filter(input=>input.checked).map(input=>Number(input.value)));const matched=[];queryRows.forEach((row,index)=>{const active=enabled.has(index)&&queryLists[index].matches;row.classList.toggle('is-match',active);row.hidden=!enabled.has(index);if(active)matched.push(queryDefinitions[index][0]);});document.querySelector('#querySummary').textContent=matched.length+' Environment condition matched';document.querySelector('#queryMatches').replaceChildren(...matched.map(label=>{const item=document.createElement('li');item.textContent=label;return item;}));document.querySelector('#queryShape').style.transform='scale('+(1-Math.min(.24,matched.length*.05))+')';}queryInputs.forEach(input=>input.addEventListener('change',renderQueries));queryLists.forEach(query=>query.addEventListener?.('change',renderQueries));document.querySelector('#queryReset').addEventListener('click',()=>{queryInputs.forEach(input=>{input.checked=true;});queryRows.forEach(row=>{row.hidden=false;});renderQueries();announce('All media queries restored');});renderQueries();
/* 11DZ_CORE_SCRIPT_END */
const workflowBridgeSpec={"name":"browser-media-device-media-query","selector":"[data-core-bridge=\"browser-media-device-media-query\"]","mode":"toggle","key":" "};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.setAttribute('aria-keyshortcuts',workflowBridgeSpec.key===' '?'Space':workflowBridgeSpec.key);const workflowBridgeToggleKeyMatches=event=>event.key===workflowBridgeSpec.key||event.key==='Spacebar'||event.code==='Space';workflowBridgeControl.addEventListener('keydown',event=>{if(!workflowBridgeToggleKeyMatches(event))return;event.preventDefault();});workflowBridgeControl.addEventListener('keyup',event=>{if(!workflowBridgeToggleKeyMatches(event))return;event.preventDefault();workflowBridgeControl.click();});workflowBridgeControl.addEventListener("change",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?'Demo timer round 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('Presentation timer 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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