Bezpieczny mini podgląd Markdown

Gotowy kod: Bezpieczny mini podgląd Markdown

HTML

<section class="lab"><h2>Bezpieczny mini podgląd Markdown</h2><label>Markdown <textarea class="md-source" rows="7"># Mój poradnik

Krótki opis przykładu.

- HTML
- CSS
- JavaScript</textarea></label><article class="md-preview"></article><p class="lab-hint">To celowo mały parser: obsługuje nagłówki, akapity i listy. Nie wykonuje HTML.</p></section>

CSS

*{box-sizing:border-box}body{margin:0;padding:35px 24px;background:#f4f5ef;color:#293322;font:15px/1.7 Arial,sans-serif;min-height:100vh;display:grid;place-items:center}button,input{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #738858;outline-offset:4px}h2,h3,p{margin-top:0}[hidden]{display:none!important}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
.lab{max-width:800px;margin:25px auto;padding:25px;border:1px solid #d4dec9;border-radius:14px;background:#fff;color:#273724;font:15px/1.6 system-ui,sans-serif;overflow-wrap:anywhere}.lab *{box-sizing:border-box}.lab h2{font-size:23px;margin:0 0 25px;line-height:1.3}.lab h3{line-height:1.3}.lab label{display:block;margin:10px 0}.lab input:not([type=checkbox]):not([type=radio]),.lab select,.lab textarea{font:inherit;padding:9px;border:1px solid #bac9ad;border-radius:6px;max-width:100%;background:#fff;color:#273724}.lab input[type=range]{width:100%;accent-color:#6f8e58}.lab input[type=color]{height:45px;width:70px}.lab input[type=checkbox]{accent-color:#6f8e58;margin-right:8px}.lab textarea{width:100%}.lab button{font:inherit;font-weight:600;border:0;border-radius:14px;background:#6f8e58;color:#fff;padding:10px 16px;cursor:pointer}.lab button:disabled{opacity:.45;cursor:default}.lab :focus-visible{outline:3px solid #315f8b;outline-offset:3px}.lab pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#f0f4e9;padding:15px;font:12px/1.6 monospace}.lab table{border-collapse:collapse;width:100%}.lab th,.lab td{padding:10px;text-align:left;border-bottom:1px solid #d9e3ce}.lab progress{accent-color:#6f8e58}.lab .lab-hint{font-size:11px;color:#687861;border-top:1px solid #dbe3d0;padding-top:16px;margin-top:25px}.lab [hidden]{display:none!important}@media(max-width:480px){.lab{padding:16px;margin:10px auto}.lab h2{font-size:20px}.lab table{font-size:12px}.lab th,.lab td{padding:7px}}@media(prefers-reduced-motion:reduce){.lab *{animation:none!important;transition:none!important}}
.md-preview{background:#eef3e5;padding:24px;border-left:3px solid #6f8e58}

JavaScript

const input=document.querySelector('.md-source'),preview=document.querySelector('.md-preview');function render(){preview.replaceChildren();let list=null;input.value.split('\n').forEach(line=>{if(!line.trim()){list=null;return}const heading=line.match(/^(#{1,3}) (.*)$/);if(line.startsWith('- ')){if(!list){list=document.createElement('ul');preview.append(list)}const li=document.createElement('li');li.textContent=line.slice(2);list.append(li);return}list=null;const el=document.createElement(heading?'h'+heading[1].length:'p');el.textContent=heading?heading[2]:line;preview.append(el)})}input.oninput=render;render();