Device Lab Page Visibility Log
Complete a page visibility record in the device lab scenario: includes real content, interactive controls, clear state feedback, and responsive layouts across sizes.
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<header class="mast"><div><span class="eyebrow">organic / Page Visibility Log / INTERMEDIATE</span><h1>Device Lab Page Visibility Log</h1><p class="intro">Complete a page visibility record in the device lab scenario: includes real content, interactive controls, clear state feedback, and responsive layouts across sizes.</p></div><span class="scenario">Device Lab</span></header>
<div class="composition-index"><section class="demo" aria-label="Device Lab page visibility logging interactive 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="36"><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-page-visibility --><div class="visibility-journal"><header><span class="eyebrow">VISIBILITY JOURNAL</span><h2>Device Lab Visibility Log</h2><output id="visibilityClock">00:00</output><p id="visibilityState">Observing page state</p></header><section><div id="visibilityMeter" role="progressbar" aria-label="Current visible time" aria-valuemin="0" aria-valuemax="60" aria-valuenow="0"><i></i></div><dl><div><dt>Visible seconds</dt><dd id="visibilitySeconds">0</dd></div><div><dt>Hidden Count</dt><dd id="visibilityHiddenCount">0</dd></div><div><dt>Current status</dt><dd id="visibilityNative">visible</dd></div></dl><button id="visibilityPause" class="action primary" type="button" data-core-bridge="browser-media-device-page-visibility">Pause Observing</button><button id="visibilityReset" class="action" type="button">Reset Log</button></section><aside><h3>State Switch</h3><ul id="visibilityEvents"><li>Monitoring Started</li></ul></aside></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-page-visibility */
const visibilityData={seconds:0,hidden:0,paused:false,events:[]};function formatVisibleTime(value){return String(Math.floor(value/60)).padStart(2,'0')+':'+String(value%60).padStart(2,'0');}function renderVisibility(){document.querySelector('#visibilityClock').textContent=formatVisibleTime(visibilityData.seconds);document.querySelector('#visibilitySeconds').textContent=String(visibilityData.seconds);document.querySelector('#visibilityHiddenCount').textContent=String(visibilityData.hidden);document.querySelector('#visibilityNative').textContent=document.visibilityState;document.querySelector('#visibilityState').textContent=visibilityData.paused?'Observer Paused':document.hidden?'Page Currently Hidden':'Page is currently visible';const meter=document.querySelector('#visibilityMeter');meter.setAttribute('aria-valuenow',String(Math.min(60,visibilityData.seconds)));meter.querySelector('i').style.width=Math.min(100,visibilityData.seconds/60*100)+'%';document.querySelector('#visibilityEvents').replaceChildren(...visibilityData.events.slice(0,6).map(entry=>{const item=document.createElement('li');item.textContent=entry;return item;}));}function logVisibility(label){visibilityData.events.unshift(new Date().toLocaleTimeString()+' · '+label);renderVisibility();}document.addEventListener('visibilitychange',()=>{if(document.hidden)visibilityData.hidden+=1;logVisibility(document.visibilityState);announce('Page state changes to '+document.visibilityState);});setInterval(()=>{if(!visibilityData.paused&&!document.hidden){visibilityData.seconds+=1;renderVisibility();}},1000);document.querySelector('#visibilityPause').addEventListener('click',event=>{visibilityData.paused=!visibilityData.paused;event.currentTarget.textContent=visibilityData.paused?'Continue observing':'Pause Observing';logVisibility(visibilityData.paused?'Manually Paused':'Continue observing');});document.querySelector('#visibilityReset').addEventListener('click',()=>{visibilityData.seconds=0;visibilityData.hidden=0;visibilityData.events=[];logVisibility('Log reset');announce('Visibility log has been reset');});logVisibility('Monitoring Started');
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workflowBridgeReset();
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