社区门户经典三栏布局
在社区门户场景中完成经典三栏布局：包含真实内容、可操作控件、清晰状态反馈和跨尺寸布局。
启用 JavaScript 后可编辑、运行和保存此案例。固定源码如下：
<!doctype html>
<html lang="zh-Hans" dir="ltr">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>社区门户经典三栏布局</title>
<style>
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.composition-deck{display:grid;grid-template-rows:auto 1fr;border:1px solid var(--line);border-radius:24px;overflow:hidden;background:color-mix(in srgb,var(--ink) 4%,var(--paper))}.deck-bar{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:12px 18px;color:var(--paper);background:var(--ink);font:700 12px/1 ui-monospace,monospace}.deck-lights{display:flex;gap:7px}.deck-lights i{width:10px;height:10px;border-radius:50%;background:var(--accent)}.deck-lights i:nth-child(2){background:var(--secondary)}.deck-lights i:nth-child(3){background:color-mix(in srgb,var(--paper) 55%,transparent)}.composition-deck .demo{border:0;border-radius:0;box-shadow:none}
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</style>
</head>
<body data-aesthetic="dark-neon" data-composition="control-deck">
<main class="page">
<header class="mast"><div><span class="eyebrow">dark-neon / 经典三栏布局 / ADVANCED</span><h1>社区门户经典三栏布局</h1><p class="intro">在社区门户场景中完成经典三栏布局：包含真实内容、可操作控件、清晰状态反馈和跨尺寸布局。</p></div><span class="scenario">社区门户</span></header>
<div class="composition-deck"><div class="deck-bar"><span>CONTROL DECK · 04</span><span>经典三栏布局</span><span class="deck-lights" aria-hidden="true"><i></i><i></i><i></i></span></div><section class="demo" aria-label="社区门户经典三栏布局交互区域"><div class="workflow-session"><header class="session-command"><div><span class="eyebrow">社区门户 SESSION</span><h2>社区会话计时台</h2></div><output id="workflowSessionClock">00:45</output><label>回合时长<input id="workflowSessionLength" type="range" min="15" max="90" step="15" value="45"><span>秒</span></label><button id="workflowSessionToggle" class="action primary" type="button">开始会话</button></header><div id="workflowSessionProgress" role="progressbar" aria-label="社区会话进度" 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:layouts-responsive-holy-grail --><div class="holy-grail-controls"><label><input id="toggleLeftRail" type="checkbox" checked data-core-bridge="layouts-responsive-holy-grail"> 左侧导航</label><label><input id="toggleRightRail" type="checkbox" checked> 右侧信息</label></div><div id="holyGrail" class="holy-grail"><header>社区门户 · HEADER</header><nav aria-label="章节导航"><a href="#holy">社区门户收藏</a><a href="#holy">社区门户概览</a><a href="#holy">社区门户计划</a><a href="#holy">社区门户灵感</a></nav><main><span class="eyebrow">HOLY GRAIL</span><h2>稳定的页眉、双侧栏与页脚</h2><p>主内容优先，两个侧栏会在窄屏自然堆叠。</p></main><aside><span>社区门户记录</span><span>社区门户协作</span><span>社区门户进度</span></aside><footer>FOOTER · 社区门户</footer></div><!-- 11DZ_CORE_END --></section><footer class="session-log"><strong id="workflowSessionScore">0 个交互检查点</strong><ol id="workflowSessionLaps" aria-label="回合记录"></ol></footer></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:layouts-responsive-holy-grail */
const holyGrail=document.querySelector('#holyGrail');document.querySelector('#toggleLeftRail').addEventListener('change',event=>{holyGrail.classList.toggle('hide-left',!event.currentTarget.checked);announce(event.currentTarget.checked?'左侧导航已显示':'左侧导航已隐藏');});document.querySelector('#toggleRightRail').addEventListener('change',event=>{holyGrail.classList.toggle('hide-right',!event.currentTarget.checked);announce(event.currentTarget.checked?'右侧信息已显示':'右侧信息已隐藏');});document.querySelectorAll('.holy-grail a').forEach(link=>link.addEventListener('click',event=>event.preventDefault()));
/* 11DZ_CORE_SCRIPT_END */
const workflowBridgeSpec={"name":"layouts-responsive-holy-grail","selector":"[data-core-bridge=\"layouts-responsive-holy-grail\"]","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+' · 核心版本 '+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+' 个交互检查点';}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?'重新开始':'继续回合';workflowSessionToggle.setAttribute('aria-pressed','false');workflowSessionDrive();announce(complete?'社区会话回合完成':'回合已暂停');}function workflowSessionStart(){if(workflowSessionState.phase==='complete'){workflowSessionState.elapsed=0;workflowSessionState.checkpoints=[];document.querySelector('#workflowSessionLaps').replaceChildren();}workflowSessionState.phase='running';workflowSessionToggle.textContent='暂停回合';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('社区会话回合已开始 · '+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('键盘操作');}});workflowSessionCore.addEventListener('click',event=>{if(event.target.closest('[data-core-bridge]'))workflowSessionLap('核心操作 · '+workflowBridgeSummary());});document.addEventListener('visibilitychange',()=>{if(document.hidden&&workflowSessionState.phase==='running')workflowSessionStop();});workflowSessionDrive();
workflowBridgeReset();
</script>
</body>
</html>