Capacidades de mídia e dispositivos do navegador

Bilhete de armazenamento local do Laboratório de Dispositivos

Conclua uma nota de armazenamento local em um cenário de laboratório de dispositivos: inclui conteúdo real, controles acionáveis, feedback claro de estado e layout responsivo a diferentes tamanhos.

Capacidades de mídia e dispositivos do navegadorLembrete de armazenamento localHTMLCSSBrowser API
É possível editar, executar e salvar este exemplo após ativar JavaScript. O código-fonte fixo é o seguinte:
<!doctype html>
<html lang="pt-BR" dir="ltr">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Bilhete de armazenamento local do Laboratório de Dispositivos</title>
  <style>
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    .page{width:min(1180px,calc(100% - 40px));margin:auto;padding:7vw 0}.mast{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(180px,.4fr);gap:5vw;align-items:end;margin-bottom:38px}.mast h1{font-family:"Songti SC",Georgia,serif;font-weight:800;font-size:clamp(42px,9vw,92px);max-width:920px;margin:0;line-height:.94}.eyebrow{display:block;margin-bottom:14px;color:var(--accent);font:800 11px/1 ui-monospace,monospace;letter-spacing:.24em}.intro{max-width:58ch;line-height:1.9}.scenario{align-self:start;padding-top:10px;border-top:1px solid var(--ink);font-style:italic}.demo{border-radius:0;border-width:2px;box-shadow:14px 14px 0 color-mix(in srgb,var(--ink) 18%,transparent);position:relative;overflow:hidden;min-height:420px;padding:clamp(22px,4vw,48px);background:var(--paper)}@media(max-width:700px){.page{width:calc(100% - 22px);padding:26px 0}.mast{grid-template-columns:1fr}.demo{min-height:340px;padding:18px}}
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</head>
<body data-aesthetic="editorial" data-composition="split-note">
  <main class="page">
    <header class="mast"><div><span class="eyebrow">editorial / nota de armazenamento local / BEGINNER</span><h1>Bilhete de armazenamento local do Laboratório de Dispositivos</h1><p class="intro">Conclua uma nota de armazenamento local em um cenário de laboratório de dispositivos: inclui conteúdo real, controles acionáveis, feedback claro de estado e layout responsivo a diferentes tamanhos.</p></div><span class="scenario">Laboratório de dispositivos</span></header>
    <div class="composition-split"><aside class="split-note"><b>CASE 02</b><span>Domine a estrutura semântica de notas de armazenamento local, a composição responsiva, a operação por teclado e a sincronização de estado.</span></aside><section class="demo" aria-label="Área interativa das anotações de armazenamento local do laboratório de dispositivos"><div class="workflow-dispatch"><aside class="dispatch-console"><span class="eyebrow">Laboratório de dispositivos DISPATCH</span><h2>Painel de verificação de dispositivos</h2><form id="workflowDispatchForm"><label>Tipo de tarefa<select id="workflowDispatchKind"><option>Capacidade da tela</option><option>Capacidade de entrada</option><option>Capacidade de armazenamento</option></select></label><label>Itens de verificação<input id="workflowDispatchAmount" type="number" min="1" max="9999" value="24"><span>item</span></label><fieldset><legend>Prioridade de processamento</legend><label><input type="radio" name="workflowPriority" value="normal" checked>Padrão</label><label><input type="radio" name="workflowPriority" value="urgent">Urgente</label></fieldset><button class="action primary" type="submit">Iniciar verificação</button></form><label>Tarefa atual<select id="workflowDispatchActive" aria-label="Alternar tarefa atual"><option value="1">Capacidade da tela</option><option value="2">Capacidade de entrada</option></select></label><output id="workflowDispatchSummary">Aguardando despacho</output></aside><section id="workflowCore" class="workflow-core dispatch-workbench" data-dispatch-priority="normal"><!-- 11DZ_CORE_START:browser-media-device-local-storage --><div class="storage-notebook"><aside><span class="eyebrow">LOCAL STORAGE</span><h2>Bilhete offline do laboratório de dispositivos</h2><p>A ação de salvar grava primeiro no navegador; em ambientes restritos, usa automaticamente a memória desta página.</p><output id="storageMode">Avaliando a capacidade de armazenamento</output></aside><form id="storageForm"><label>Título<input id="storageTitle" required value="Registro do laboratório de dispositivos"></label><label>rótulo<select id="storageTag"><option>Pendente</option><option>Inspiração</option><option>Concluído</option></select></label><label class="storage-body">Corpo do texto<textarea id="storageBody" rows="5" required>Registre uma instrução operacional que possa ser mantida offline.</textarea></label><button class="action primary" type="submit" data-core-bridge="browser-media-device-local-storage">Salvar nova versão</button><button id="storageRemove" class="action" type="button">Excluir dados locais</button></form><section><h3>Registro de versões</h3><ol id="storageVersions"></ol></section></div><!-- 11DZ_CORE_END --></section></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:browser-media-device-local-storage */
const storageKey='browser-media-device-local-storage-device-lab:versions';const storageMemory=[];let storageAvailable=true;function readStorage(){try{return JSON.parse(localStorage.getItem(storageKey)||'[]');}catch{storageAvailable=false;return storageMemory;}}function writeStorage(items){if(storageAvailable){try{localStorage.setItem(storageKey,JSON.stringify(items));return;}catch{storageAvailable=false;}}storageMemory.splice(0,storageMemory.length,...items);}function renderStorage(){const items=readStorage();document.querySelector('#storageMode').textContent=storageAvailable?'Armazenamento persistente disponível · '+items.length+' de versões':'Ambiente restrito · memória desta página '+items.length+' de versões';document.querySelector('#storageVersions').replaceChildren(...items.map(entry=>{const item=document.createElement('li');const title=document.createElement('strong');const meta=document.createElement('small');title.textContent=entry.title;meta.textContent=entry.tag+' · '+entry.length+' caractere';item.append(title,meta);return item;}));}document.querySelector('#storageForm').addEventListener('submit',event=>{event.preventDefault();const items=readStorage();items.unshift({title:document.querySelector('#storageTitle').value.trim(),tag:document.querySelector('#storageTag').value,length:document.querySelector('#storageBody').value.trim().length,at:Date.now()});writeStorage(items.slice(0,6));renderStorage();announce('Nova versão salva das notas offline');});document.querySelector('#storageRemove').addEventListener('click',()=>{writeStorage([]);if(storageAvailable){try{localStorage.removeItem(storageKey);}catch{storageAvailable=false;}}renderStorage();announce('Os dados locais deste caso foram excluídos');});renderStorage();
/* 11DZ_CORE_SCRIPT_END */
const workflowBridgeSpec={"name":"browser-media-device-local-storage","selector":"[data-core-bridge=\"browser-media-device-local-storage\"]","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+' · versão principal '+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 workflowDispatchCore=document.querySelector('#workflowCore');const workflowDispatchForm=document.querySelector('#workflowDispatchForm');const workflowDispatchSelect=document.querySelector('#workflowDispatchActive');const workflowDispatchJobs=new Map([["1",{"label":"Capacidade da tela","amount":12,"priority":"normal","touches":0}],["2",{"label":"Capacidade de entrada","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('Tarefa atual de verificação do dispositivo:'+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'?' · Urgente':'');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>
</body>
</html>
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