Exercise20 - finished

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Our aims are to:

1. The tablist element needs to be given an accessible name.
2. Set aria-selected="true" on the first <button>.
3. Set aria-selected="false" on other <button> elements.
4. Set aria-controls on all <button> elements.
5. Set matching id values on all tabpanel elements.
6. Set all tabpanel elements with tabindex="0".
7. Set hidden on the second and third tabpanel elements.
8. Set aria-labelledby on all tabpanel elements.
9. Set matching id valuues on the all tab elements.
10. Set tabindex="-1" on the second and third tab elements.

Example

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