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fix(curriculum): add an example for the "required" attribute (#58993)

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curriculum/challenges/english/14-responsive-web-design-22/learn-html-by-building-a-cat-photo-app/5ef9b03c81a63668521804db.md
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@ -7,7 +7,15 @@ dashedName: step-43
# --description--
To prevent a user from submitting your form when required information is missing, you need to add the `required` attribute to an `input` element. There's no need to set a value to the `required` attribute. Instead, just add the word `required` to the `input` element, making sure there is space between it and other attributes.
To prevent a user from submitting your form when required information is missing, you need to add the `required` attribute to an `input` element.
Here is an example of an input field with the `required` attribute:
```html
<input type="text" name="firstName" required>
```
There's no need to set a value to the `required` attribute. Instead, just add the word `required` to the `input` element, making sure there is space between it and other attributes.
# --hints--