Font Awesome 5 Choosing the Correct Font-Family in Pseudo-Elements

Font Awesome 5 Choosing the correct font-family in pseudo-elements

Simply use all of them in the same font-family and the browser will do the job. If it doesn't find it in the first one, it will use the second one. (Multiple fonts in Font-Family property?)

By the way, the correct font-family is Free not Solid because the difference between Solid and Regular is the font-weight and both have the same font-family. There is no Solid and Regular in font-family, only Free and Brands.

You may also notice that almost all the Solid version of the icons are free BUT not all the regular version are free. Some of them are included in the PRO package. If an icon is not showing it's not necessarely a font-family issue.

All the Light and duotone version are PRO ones.

.icon {  display: inline-block;  font-style: normal;  font-variant: normal;  text-rendering: auto;  -webkit-font-smoothing: antialiased;  font-family: "Font Awesome 5 Brands","Font Awesome 5 Free";}
.icon1:before {  content: "\f099";  /* TWITTER ICON */  font-weight: 400;}
.icon2:before {  content: "\f095";  /* PHONE ICON */  font-weight: 900;}
.icon3:before {  content: "\f095";  /* PHONE ICON */  font-weight: 400;/*This one will not work because the regular version of the phone icon is in the Pro Package*/}

<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.11.0/css/all.css" >
<div class="icon1 icon"></div><div class="icon2 icon"></div><br>
<div class="icon3 icon"></div>

Font Awesome 5 icon not rendering in :before element on Chrome

Your jsfiddle has incorrect font-family specified.

The correct one is Font Awesome 5 Free (for the CDN font link you used).

Also you have to set font-weight: 900 to have bold squares.

ul li {   list-style: none;}
ul li:before {        margin-right: 10px;        font-family: 'Font Awesome 5 Free';        font-weight: 900;        content: '\f0c8';        color: #c00;    }

<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/css/all.min.css" rel="stylesheet"/>
As a list bullet (li:before) Firefox (v74) shows correct full square icon, Chrome (v80) shows an outlined square like missing character.
<ul><li>Bullet 1</li><li>Bullet 2</li></ul>
Inserted as 'normal' <i> element, the icon shows in both browsers: <i class="fas fa-square"></i>

Font Awesome in CSS pseudo elements not showing

The Font family should specify Free.

Also note that for solid icons you would have to use font-weight:900

a[data-toggle="collapse"] {  position: relative;}
a[aria-expanded="false"]::before,a[aria-expanded="true"]::before {  font-family: "Font Awesome 5 Free";  content: "\f106";  font-weight: 900;  display: block;  position: absolute;  right: 20px;  font-size: 0.6em;}
a[aria-expanded="true"]::before {  font-family: "Font Awesome 5 Solid";  content: "\f106";}

<link href="https://use.fontawesome.com/releases/v5.0.13/css/all.css" rel="stylesheet" /><div class="wrapper">  <nav id="sidebar">    <li class="active">      <a href="#pageSubmenu" data-toggle="collapse" aria-expanded="false">        <i class="far fa-file-alt"></i> Pages      </a>    </li>  </nav></div>

The before pseudo element not working in Font awesome v.5

UPDATE 3:

The font-family is wrong.

use font-family: "Font Awesome 5 Brands"

And maybe you have to set a font-weight see documentation

UPDATE 2: TL;DR

The font-family is wrong.

use font-family: "Font Awesome 5 Brands"

For Font Awesome 5 this must be one of the following:

Updated because you use css webfonts:

For method Web Fonts with CSS

Free

font-family: "Font Awesome 5 Free"

Pro

font-family: "Font Awesome 5 Pro"

Brands => use this!

font-family: "Font Awesome 5 Brands"

See here:
https://jsfiddle.net/nwodoo32/1/

For method SVG with Javascript

Solid

font-family: "Font Awesome 5 Solid"

Regular

font-family: "Font Awesome 5 Regular"

Brands

font-family: "Font Awesome 5 Brands"

Light (Pro)

font-family: "Font Awesome 5 Light"

Font Awesome 5, how to style svg pseudo element?

When using the pseudo-element technique with the JS version, Font Awesome will use only the properties related to the icon to generate the SVG (content,font-family, font-weight, etc) and the pseudo-element will become useless. If you check the the documentation you will find that you need to add display:none to the pseudo element:

Set Pseudo Elements’ display to none

Since our JS will find each icon reference (using your pseudo element styling) and insert an icon into your page’s DOM automatically, we’ll need to hide the real CSS-created pseudo element that’s rendered.^ref

If you need to apply properties like float you need to apply them to the generated SVG not the pseudo element. So simply target the SVG:

span:before {  font-family: "Font Awesome 5 Free";  font-weight: 900;  content: "\f007";  /*display:none; I commented this mandatory property to see what is happening */   color:red; /* will do nothing*/  float:right; /* will do nothing*/}

/*target the svg for styling*/.target-svg svg {  color: blue;  float:right;}

<script data-search-pseudo-elements src="https://use.fontawesome.com/releases/v5.8.1/js/all.js"></script><span class="target-svg">the icons is on the right --></span><br><span>the icons will not be styled</span>

Font awesome 4/5 icons are show up correct

Use Brands instead of Free

To set them in one line(as in image) use display:flex;

.xcon-facebook:before { content: '\f09a'; font-family: 'Font Awesome 5 Brands'; }.xcon-twitter:before { content: '\f099'; font-family: 'Font Awesome 5 Brands'; } .xcon-linkedin:before { content: '\f0e1';  font-family: 'Font Awesome 5 Brands'; }.xcon-instagram:before { content: '\f16d'; font-family: 'Font Awesome 5 Brands'; } .xcon-stackoverflow:before { content: '\f16c'; font-family: 'Font Awesome 5 Brands'; } ul{display:flex; list-style: none;}li{padding:5px;}

<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.2.0/css/all.css" integrity="sha384-hWVjflwFxL6sNzntih27bfxkr27PmbbK/iSvJ+a4+0owXq79v+lsFkW54bOGbiDQ" crossorigin="anonymous"><ul>  <li><a href="#"><i class="xcon-facebook"></i></a></li>  <li><a href="#"><i class="xcon-twitter"></i></a></li>  <li><a href="#"><i class="xcon-linkedin"></i></a></li>  <li><a href="#"><i class="xcon-instagram"></i></a></li>  <li><a href="#"><i class="xcon-stackoverflow"></i></a></li></ul>

Font Awesome 5 Choosing the Correct Font-Family in Pseudo-Elements