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.
<input "text" name="catphotourl" placeholder="cat photo"URL"required">
Please post your code and a link to the challenge. These are automatically included in your post if you use the Ask For Help button.
Mod edit: solution redacted
It is great that you solved the challenge, but instead of posting your full working solution, it is best to stay focused on answering the original poster’s question(s) and help guide them with hints and suggestions to solve their own issues with the challenge.
We are trying to cut back on the number of spoiler solutions found on the forum and instead focus on helping other campers with their questions and definitely not posting full working solutions.
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