File: contain-html-overflow-001.html

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<!doctype html>
<html lang=en>
  <meta charset=utf-8>
  <title>CSS-contain test: layout containment on html prevents overflow 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 overflow propagation">
  <link rel="match" href="reference/contain-body-overflow-001-ref.html">
  <link rel=help href="https://drafts.csswg.org/css-contain-1/#contain-property">

<style>
html, body, p, div {
    margin: 0;
    width: 200px;
    height: 200px;
}
div { background: red; }
body {
    overflow: hidden;
}
html {
    contain: layout;
}
</style>

<p>Test passes if there is no red.

<div></div>