I can nest it why the input?

[ilenia]

@44007029

<input type="text" placeholder="cat photo URL">

this is the existing input element

@44007029

 <form  action="https://www.freecatphotoapp.com/submit-cat-photo">
</input>
</form>

this is the form element, the existing input element is not inside it

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I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').