<!doctype html><html lang="en">
 <head>
  <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
  <title>Custom State Pseudo Class</title>
  <meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
  <link href="https://www.w3.org/StyleSheets/TR/2021/cg-draft" rel="stylesheet">
  <link href="https://wicg.github.io/custom-state-pseudo-class/" rel="canonical">
  <meta content="dark light" name="color-scheme">
  <link href="https://www.w3.org/StyleSheets/TR/2021/dark