---
id: 642db8c409d9991d0b3b2f0d
title: Step 1
challengeType: 0
dashedName: step-1
demoType: onLoad
---

# --description--

Your project starts with a basic HTML container and some corresponding CSS. Your first task will be to programmatically generate the cells for your spreadsheet.

The global `window` object represents the browser window (or tab). It has an `onload` property which allows you to define behavior when the window has loaded the entire page, including stylesheets and scripts.

Start by setting the `onload` property of `window` to an arrow function with no parameters. In the function, declare a `container` variable and assign it the value of getting the element by the `id` of `"container"`.

# --hints--

You should access the `onload` property of the `window` object.

```js
assert.match(code, /window\.onload/);
```

You should set the `onload` property to a function.

```js
assert.isFunction(window.onload);
```

You should use arrow syntax.

```js
assert.match(code, /window\.onload\s*=\s*\(/);
```

Your `onload` function should not take any parameters.

```js
assert.match(code, /window\.onload\s*=\s*\(\s*\)/);
```

You should declare a `container` variable in your `onload` function.

```js
assert.match(code, /window\.onload\s*=\s*\(\s*\)\s*=>\s*\{\s*(?:let|var|const)\s+container/);
```

Your `container` variable should be declared with `const`.

```js
assert.match(code, /window\.onload\s*=\s*\(\s*\)\s*=>\s*\{\s*const\s+container/);
```

You should use `document.getElementById()`

```js
assert.match(code, /document\.getElementById\(/);
```

You should get the element with the `id` of `"container"`.

```js
assert.match(code, /document\.getElementById\(\s*('|"|`)container\1\s*\)/);
```

You should assign the `#container` element to `container`.

```js
assert.match(code, /window\.onload\s*=\s*\(\s*\)\s*=>\s*\{\s*const\s+container\s*=\s*document\.getElementById\(\s*('|"|`)container\1\s*\)/);
```

# --seed--

## --seed-contents--

```html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link rel="stylesheet" href="./styles.css" />
    <title>Functional Programming Spreadsheet</title>
  </head>
  <body>
    <div id="container">
      <div></div>
    </div>
    <script src="./script.js"></script>
  </body>
</html>
```

```css
#container {
  display: grid;
  grid-template-columns: 50px repeat(10, 200px);
  grid-template-rows: repeat(11, 30px);
}

.label {
  background-color: lightgray;
  text-align: center;
  vertical-align: middle;
  line-height: 30px;
}
```

```js
--fcc-editable-region--

--fcc-editable-region--
```
