---
id: 642db8c409d9991d0b3b2f0d
title: Step 1
challengeType: 0
dashedName: step-1
---
# --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
Functional Programming Spreadsheet