title: What are these attributes that appear as 'light pink' in the Chrome Developer Tools?
body: <p>Look at this image, from the Google Developer tools:</p>
  
  <p><img src="https://i.imgur.com/UJnZRJl.png" alt="image"></p>
  
  <p>See that there are 2 shades of pink, <code>dark</code> and <code>light</code>.</p>
  
  <p>I always thought that <code>light pink</code> where inherited attributes (prototype). Then, for the first time, I was debugging a library and I found <code>light pink</code> attributes that were not in the prototype. See <code>phones.addFields</code>.</p>
  
  <p>The reason why I found these if because I did a <code>Object.assign</code> and some attributes were missing. So I realized that <code>light pink</code> attributes are not assigned in <code>Object.assign</code>.</p>
  
  <p>So, what are these <code>light pink</code> attributes? How come <code>phones.addField</code> is <code>light pink</code>?</p>