Create A Set Of Radio Buttons

<form action="https://freecatphotoapp.com/submit-cat-photo">
    <label for="indoor"> 
        <input id="indoor" type="radio" name="indoor-outdoor">Indoor 
    <label for="outdoor"> 
        <input id="outdoor" type="radio" name="indoor-outdoor">Outdoor 

It is considered best practice to set a for attribute on the label element, with a value that matches the value of the id attribute of the input element. This allows assistive technologies to create a linked relationship between the label and the child input element.