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docs/font-awesome/scss/_core.scss

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+// base icon class definition
+// -------------------------
+@use 'variables' as v;
+@use 'mixins' as m;
+
+.#{v.$css-prefix}-solid,
+.#{v.$css-prefix}-regular,
+.#{v.$css-prefix}-brands,
+.#{v.$css-prefix}-classic,
+.fas,
+.far,
+.fab,
+.#{v.$css-prefix} {
+  @include m.fa-icon();
+}
+
+:is(
+  .fas,
+  .far,
+  .fab,
+  .#{v.$css-prefix}-solid,
+  .#{v.$css-prefix}-regular,
+  .#{v.$css-prefix}-brands,
+  .#{v.$css-prefix}-classic,
+  .fa
+)::before {
+  content: var(#{v.$icon-property})/"";
+}
+
+@supports not (content: ''/'') {
+:is(
+  .fas,
+  .far,
+  .fab,
+  .#{v.$css-prefix}-solid,
+  .#{v.$css-prefix}-regular,
+  .#{v.$css-prefix}-brands,
+  .#{v.$css-prefix}-classic,
+  .fa
+)::before {
+    content: var(#{v.$icon-property});
+  }
+}