curriculum/challenges/english/blocks/learn-html-by-building-a-cat-photo-app/5ef9b03c81a63668521804df.md
The id attribute is used to identify specific HTML elements. Each id attribute's value must be unique from all other id values for the entire page.
Here is an example of an input element with an id attribute:
<input id="email">
Add an id attribute with the value indoor to the radio button. When elements have multiple attributes, the order of the attributes doesn't matter.
Your radio button should still be located between the opening and closing tags of the label element.
const labelChildNodes = [...document.querySelectorAll('form > label')?.[0]?.childNodes];
assert(
labelChildNodes.filter((childNode) => childNode.nodeName === 'INPUT').length
);
Your radio button should have an id attribute. Check that there is a space after the opening tag's name and/or there are spaces before all attribute names.
assert.isTrue(document.querySelector('input')?.hasAttribute('id'));
Your radio button should have a type attribute. Check that there is a space after the opening tag's name and/or there are spaces before all attribute names.
assert.isTrue(document.querySelector('input')?.hasAttribute('type'));
Your radio button should have an id attribute with the value indoor. You have either omitted the value or have a typo. Remember that attribute values should be surrounded with quotation marks.
assert.match(document.querySelector('input')?.id, /^indoor$/);
<html>
<body>
<main>
<h1>CatPhotoApp</h1>
<section>
<h2>Cat Photos</h2>
<p>Everyone loves <a href="https://cdn.freecodecamp.org/curriculum/cat-photo-app/running-cats.jpg">cute cats</a> online!</p>
<p>See more <a target="_blank" href="https://freecatphotoapp.com">cat photos</a> in our gallery.</p>
<a href="https://freecatphotoapp.com"></a>
</section>
<section>
<h2>Cat Lists</h2>
<h3>Things cats love:</h3>
<ul>
<li>catnip</li>
<li>laser pointers</li>
<li>lasagna</li>
</ul>
<figure>
<figcaption>Cats <em>love</em> lasagna.</figcaption>
</figure>
<h3>Top 3 things cats hate:</h3>
<ol>
<li>flea treatment</li>
<li>thunder</li>
<li>other cats</li>
</ol>
<figure>
<figcaption>Cats <strong>hate</strong> other cats.</figcaption>
</figure>
</section>
<section>
<h2>Cat Form</h2>
<form action="https://freecatphotoapp.com/submit-cat-photo">
--fcc-editable-region--
<label><input type="radio"> Indoor</label>
--fcc-editable-region--
<input type="text" name="catphotourl" placeholder="cat photo URL" required>
<button type="submit">Submit</button>
</form>
</section>
</main>
</body>
</html>