(Please don't piggyback your questions on another student's post, Becki.)

How do I validate color input in JavaScript?

I am a beginner and have created a form with an input type color in HTML. Now I need to alert the user if they did not choose/change the color when submitting the form. I have validated all of the other information, I am just having issues with this part of the form. I am not sure if I have to set a default color and then call it in javaScript.
This is what I have in HTML for the color input.

<label>Color Collection:</label><br>
<input type="color" id="favcolor" ><br>

Any help would be greatly appreciated.