Device Lab media query observer
Complete the media query inspector in a Device Lab scenario: includes real content, actionable controls, clear state feedback, and layouts across sizes.
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<title>Device Lab media query observer</title>
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<header class="mast"><div><span class="eyebrow">dark-neon / media query viewer / INTERMEDIATE</span><h1>Device Lab media query observer</h1><p class="intro">Complete the media query inspector in a Device Lab scenario: includes real content, actionable controls, clear state feedback, and layouts across sizes.</p></div><span class="scenario">Device Lab</span></header>
<div class="composition-index"><section class="demo" aria-label="Device Lab Media Query Observer Interaction Area"><div class="workflow-dispatch"><aside class="dispatch-console"><span class="eyebrow">Device Lab DISPATCH</span><h2>Device check dashboard</h2><form id="workflowDispatchForm"><label>Task Type<select id="workflowDispatchKind"><option>Screen Capability</option><option>Input capability</option><option>Storage Capability</option></select></label><label>Check Items<input id="workflowDispatchAmount" type="number" min="1" max="9999" value="21"><span>Item</span></label><fieldset><legend>Processing priority</legend><label><input type="radio" name="workflowPriority" value="normal" checked>Regular</label><label><input type="radio" name="workflowPriority" value="urgent">Urgent</label></fieldset><button class="action primary" type="submit">Start checking</button></form><label>Current task<select id="workflowDispatchActive" aria-label="Switch current task"><option value="1">Screen Capability</option><option value="2">Input capability</option></select></label><output id="workflowDispatchSummary">Waiting for Dispatch</output></aside><section id="workflowCore" class="workflow-core dispatch-workbench" data-dispatch-priority="normal"><!-- 11DZ_CORE_START:browser-media-device-media-query --><div class="query-observatory"><header><span class="eyebrow">MEDIA QUERY MATRIX</span><h2>Device Lab 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></div><p id="status" class="status" role="status" aria-live="polite"></p></section><aside class="index-mark" aria-hidden="true"><strong>05</strong><span>Device Lab FIELD INDEX</span></aside></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 workflowDispatchCore=document.querySelector('#workflowCore');const workflowDispatchForm=document.querySelector('#workflowDispatchForm');const workflowDispatchSelect=document.querySelector('#workflowDispatchActive');const workflowDispatchJobs=new Map([["1",{"label":"Screen Capability","amount":12,"priority":"normal","touches":0}],["2",{"label":"Input capability","amount":21,"priority":"urgent","touches":0}]]);let workflowDispatchSerial=workflowDispatchJobs.size;function workflowDispatchDrive(job,activate=false){workflowDispatchCore.dataset.dispatchPriority=job.priority;workflowDispatchCore.style.setProperty('--dispatch-load',Math.min(.95,.16+job.amount/120));const bridge=activate?workflowBridgeActivate():{changed:false,summary:workflowBridgeSummary()};document.querySelector('#workflowDispatchSummary').textContent=job.label+' · '+job.amount+' Item · '+bridge.summary;announce('Current task on the device check:'+job.label);}function workflowDispatchRender(activeId,activate=false){workflowDispatchSelect.replaceChildren(...[...workflowDispatchJobs].map(([id,job])=>{const option=document.createElement('option');option.value=id;option.textContent=job.label+(job.priority==='urgent'?' · Urgent':'');return option;}));workflowDispatchSelect.value=activeId;workflowDispatchDrive(workflowDispatchJobs.get(activeId),activate);}workflowDispatchForm.addEventListener('submit',event=>{event.preventDefault();const data=new FormData(workflowDispatchForm);const id=String(++workflowDispatchSerial);workflowDispatchJobs.set(id,{label:document.querySelector('#workflowDispatchKind').value,amount:Math.max(1,Number(document.querySelector('#workflowDispatchAmount').value)||1),priority:data.get('workflowPriority'),touches:0});workflowDispatchRender(id,true);});workflowDispatchSelect.addEventListener('change',()=>workflowDispatchDrive(workflowDispatchJobs.get(workflowDispatchSelect.value),true));workflowDispatchCore.addEventListener('focusin',()=>{const job=workflowDispatchJobs.get(workflowDispatchSelect.value);if(!job)return;job.touches+=1;document.querySelector('#workflowDispatchSummary').textContent=job.label+' · '+job.amount+' Item · '+workflowBridgeSummary();});workflowDispatchRender('1',false);
workflowBridgeReset();
</script>
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