JSFiddle - React, Tailwind, and code Playground

HTML

<h1>
Где DIV'Ы?
</h1>

CSS

.cell {
  display: inline-block;
  border: 1px solid black;
}

JavaScript

function Grid(height, width) {
  this.space = new Array(height * width);
  this.height = height;
  this.width = width;
}

Grid.prototype.render = function () {
    for (let y = 0; y < this.height; y++) {
    for (let x = 0; x < this.width; x++) {
      let cell = document.createElement("div");
      //cell.innerHTML = this.space[x + (y * width)];
      cell.innerHTML = "x";
      cell.className = "cell";
      document.body.appendChild(cell);
    }
    let translate = document.createElement("br");
    document.body.appendChild(translate);
  }
}

let map = new Grid(5, 5);

document.body.onload = map.render;