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+<!doctype html>
+<html lang=en>
+ <meta charset=utf-8>
+ <title>CSS-contain test: layout containment on html prevents writing-mode propagation</title>
+ <link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net">
+ <meta name=flags content="">
+ <meta name=assert content="layout containment on html prevents writing-mode propagation">
+ <link rel="match" href="reference/contain-body-w-m-001-ref.html">
+ <link rel=help href="https://drafts.csswg.org/css-contain-1/#contain-property">
+
+<style>
+html::before {
+ content: "";
+ width: 100px;
+ height: 100px;
+ background: orange;
+ display: block;
+}
+p { writing-mode: horizontal-tb; margin: 0;}
+body {
+ margin: 0;
+ width: 200px;
+ height: 200px;
+ writing-mode: vertical-rl;
+}
+html {
+ contain: layout;
+}
+</style>
+
+<p>Test passes if the orange square is in the upper-left corner.