Pseudo-element

Rule pseudo-element will enforce that:

• Pseudo-elements must start with double colons.
• Pseudo-classes must start with single colon.

Examples

When enabled, the following are allowed:

.foo::before {
  content: "bar";
}

.foo:hover {
  content: "bar";
}

When enabled, the following are disallowed:

.foo:before {
  content: "bar";
}

.foo::hover {
  content: "bar";
}