<!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> |