Why does an inline element accept width and height when floated?

Now I have a span element I give it width and height for example 500px I know it inline element so it doesn't accept width and height but why it applies when I float it??

span.first {
  width: 500px;
  height: 500px;
  border: 1px solid #000;
  float: right;
}

span.second {
  width: 500px;
  height: 500px;
  border: 1px solid #000;
}

<span class="first">with float</span>
<span class="second">without float</span>

https://codepen.io/kemozzz/pen/KvVrXj

Why does an inline element accept width and height when floated?

2 Answers