Exercise 17: Using
 aria-invalid - finished

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Our aims are:

1. Set the first <input> with aria-invalid="false".
2. Set the second <input> with aria-invalid="true".
3. Set the third <input> with aria-invalid="grammar".
4. Set the fourth <input> with aria-invalid="spelling".
5. Listen to each <input> using a screen reader.

Example

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