🎨画板
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data:text/html,<body oninput="i.srcdoc=h.value+'<style>'+c.value+'</style><script>'+j.value+'</script>'"><style> textarea, iframe { width: 100%; height: 50%; background-color: rgb(245, 245, 245); } body { margin: 0; background-color: rgb(245, 245, 245); } textarea, iframe { width: 33.3%; height: 100%; flex: 1; font-size: 18; resize: none; } textarea:focus { background-color: white; } .menu { text-align: center; overflow: hidden; width: 100%; padding: 5px 0; } .panels { display: flex; justify-content: center; height: calc(100% - 40px); }</style><script> function switchDisplay(id) { var dom = document.getElementById(id); if (!dom) return; if (dom.style.display !== '') { dom.style.display = ''; return; } if (dom.style.display === '') { dom.style.display = 'none'; return; } }</script><div class="menu"><button onclick="switchDisplay('h')">HTML</button><button onclick="switchDisplay('c')">CSS</button><button onclick="switchDisplay('j')">JavaScript</button><button onclick="switchDisplay('i')">Output</button></div><div class="panels"><textarea placeholder=HTML id=h></textarea><textarea placeholder=CSS id=c></textarea><textarea placeholder=JS id=j></textarea><iframe id=i></div>