fune/testing/web-platform/tests/css/css-overflow/overflow-body-propagation-006.html
Emilio Cobos Álvarez 1de29ffe19 Bug 1586600 - Make nsPresContext's overflow propagation match the spec. r=hiro
From https://drafts.csswg.org/css-overflow/#overflow-propagation:

> UAs must apply the overflow-* values set on the root element to the viewport.
> However, when the root element is an [HTML] html element (including XML syntax
> for HTML) whose overflow value is visible (in both axes), and that element has
> a body element as a child, user agents must instead apply the overflow-*
> values of the first such child element to the viewport. The element from which
> the value is propagated must then have a used overflow value of visible.

This was out of sync with Document::IsScrollingElement, which implements the
right thing.

Differential Revision: https://phabricator.services.mozilla.com/D49196

--HG--
extra : moz-landing-system : lando
2019-10-15 10:33:14 +00:00

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HTML

<!doctype html>
<title>CSS Overflow Test: scroll-snap-type doesn't stop overflow from being propagated from the body</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://drafts.csswg.org/css-overflow/#overflow-propagation">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1586600">
<link rel="match" href="reference/overflow-body-propagation-ref.html">
<style>
:root {
scroll-snap-type: both mandatory;
}
body {
overflow: scroll;
margin-top: 100px;
}
</style>
<body>The viewport should have scrollbars, not the body.</body>