| <!doctype html> | |
| <link rel="match" href="pseudo-class-defined-print-ref.html"> | |
| <style> | |
| custom-element { | |
| display: block; | |
| width: 100px; | |
| height: 100px; | |
| background: green; | |
| } | |
| custom-element:not(:defined) { | |
| background: red; | |
| } | |
| </style> | |
| <custom-element></custom-element> | |
| <script> | |
| customElements.define("custom-element", class extends HTMLElement { }); | |
| </script> |