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Step 7

curriculum/challenges/english/blocks/learn-responsive-web-design-by-building-a-piano/612e8279827a28352ce83a72.md

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--description--

Now copy the set of seven .key elements, and paste two more sets into the .keys div.

--hints--

You should have 21 .key elements.

js
const keys = document.querySelectorAll('.key');
assert(keys?.length === 21);

You should have 15 .black--key elements.

js
const blackKeys = document.querySelectorAll('.black--key');
assert(blackKeys?.length === 15);

All .key elements should be within your .keys element.

js
const keys = document.querySelector('.keys');
assert(keys?.querySelectorAll('.key')?.length === 21);

All .black--key elements should be within your .keys element.

js
const keys = document.querySelector('.keys');
assert(keys?.querySelectorAll('.black--key')?.length === 15);

--seed--

--seed-contents--

html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Piano</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  </head>
  <body>
    --fcc-editable-region--
    <div id="piano">
      <div class="keys">
        <div class="key"></div>
        <div class="key black--key"></div>
        <div class="key black--key"></div>
        <div class="key"></div>
        <div class="key black--key"></div>
        <div class="key black--key"></div>
        <div class="key black--key"></div>
      </div>
    </div>
    --fcc-editable-region--
  </body>
</html>
css