0001以下、5ちゃんねるからVIPがお送りします
2023/05/18(木) 18:37:23.277ID:diDF5D+z0```js
var region = document.createElement("div");
region.id = "r1";
region.textContent = "Hello Blue!";
document.body.appendChild(region);
document.getElementById("r1").style.backgroundColor = "blue";
```