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+<!doctype HTML>
+<title>Background-attachment: scroll should be positioned relative to the root element and should extend to cover the entire canvas in the presence of fixed backgrounds</title>
+<link rel="author" title="Philip Rogers" href="mailto:pdr@chromium.org">
+<link rel="help" href="https://www.w3.org/TR/css-backgrounds-3/#root-background">
+<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#the-background-attachment">
+<link rel="match" href="background-attachment-margin-root-001-ref.html">
+<style>
+ html {
+ background: linear-gradient(rgba(0,255,0,0.5), rgba(0,0,255,0.5)), linear-gradient(rgba(0,0,0,1), rgba(0,0,0,1));
+ background-attachment: scroll, fixed;
+ background-size: 100px 100px, 100px 100px;
+ height: 300px;
+ margin: 50px;
+ }
+</style>