chore: add example for 'contain: style'

bsmth · bsmth · commit 6d62d08f4c85 · 2022-08-22T14:28:00.000+02:00
diff --git a/contain/contain-style.html b/contain/contain-style.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>Float interference</title>
+    <style>
+      body {
+        counter-reset: headings;
+      }
+
+      h1::before {
+        counter-increment: headings;
+        content: counter(headings) ": ";
+      }
+
+      .contain {
+        contain: style;
+      }
+    </style>
+  </head>
+  <body>
+    <h1>Introduction</h1>
+    <h1>Background</h1>
+    <div class="contain">
+      <h1>Contained counter</h1>
+    </div>
+    <h1>Conclusion</h1>
+  </body>
+</html>
