Tidy up pseudo-element references

snippets/display-empty-links.md

@@ -11,14 +11,14 @@ Displays the link URL for links with no text.
 
 - Use the `:empty` pseudo-class to select links with no text.
 - Use the `:not` pseudo-class to exclude links with text.
-- Use the `content` property and the `attr()` function to display the link URL in the `:before` pseudo-element.
+- Use the `content` property and the `attr()` function to display the link URL in the `::before` pseudo-element.
 
 ```html
 <a href="https://30secondsofcode.org"></a>
 ```
 
 ```css
-a[href^="http"]:empty:before {
+a[href^="http"]:empty::before {
   content: attr(href);
 }
 ```