'Font Awesome 5 on pseudo elements shows square instead of icon

I am trying to change the content of a span with a Font Awesome icon directly from the CSS page but can't seem to make it work properly.

1) I have imported FA from the documentation and in the <head>

<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.0.9/css/all.css" integrity="sha384-5SOiIsAziJl6AWe0HWRKTXlfcSHKmYV4RBF18PPJ173Kzn7jzMyFuTtk8JA7QQG1" crossorigin="anonymous">

2) My html looks like this : 

<span class='myClass'>Movies</span>

3) Let's now say I would like to change the content of the span with an icon directly from the CSS Page.

My css currently looks like this but it isn't working, it gives me a square instead of the icon.

.myClass {
  font-size:25px;
}

.myClass::after {
  font-family: 'Font Awesome 5 Free';
  content: '\f008';
}
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.0.9/css/all.css">
<span class='myClass'></span>

Funny thing is that it looks like it is working with some icons. If I test with content: '\f007'; it works. Any idea why?

(And if you wonder why I want to change the icon directly in the CSS, it is because I am using media queries so I can't add it directly in the HTML page)

htmlcssfont-awesomepseudo-elementfont-awesome-5


Solution 1:[1]

from your comment :

Awesome, thanks for the explanation ! Do you know what font-weight I would need to use if the light version would have been free ?

test text-stroke with a transparent color to get a thinner render :

.myClass {
  font-size: 45px;
}

.myClass::after {
  font-family: 'Font Awesome 5 Free';
  content: "\f008";
  font-weight: 900;
  -webkit-text-stroke;
  transparent 0.2em;
}

.myClass+.myClass::after {
  -webkit-text-stroke: white 0.02em;
}

.bis {
  font-size: 4rem;
  color: blue
}
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.13.0/css/all.css">
<span class='myClass'></span>
<span class='myClass'></span>
<span class='myClass bis '></span>
<u>
<span class='myClass bis '></span></u>

Solution 2:[2]

list-style-image: url("../../media/examples/rocket.svg");

source: https://developer.mozilla.org/en-US/docs/Web/CSS/list-style-image

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 G-Cyrillus
Solution 2 fruitloaf

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