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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Backgrounds and Borders Module Level 3: parsing background with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.csswg.org/css-backgrounds/#background">
+<meta name="assert" content="background supports the full grammar '<bg-layer># , <final-bg-layer>'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+// Background serialization varies across browsers. https://github.com/w3c/csswg-drafts/issues/418
+
+test_valid_value("background",
+ 'url("https://example.com/") 1px 2px / 3px 4px space round local padding-box content-box, rgb(5, 6, 7) url("https://example.com/") 1px 2px / 3px 4px space round local padding-box content-box', [
+ 'url("https://example.com/") 1px 2px / 3px 4px space round local padding-box content-box, rgb(5, 6, 7) url("https://example.com/") 1px 2px / 3px 4px space round local padding-box content-box', // spec
+ 'url("https://example.com/") local space round 1px 2px / 3px 4px padding-box content-box, url("https://example.com/") local space round 1px 2px / 3px 4px padding-box content-box rgb(5, 6, 7)', // Edge
+ 'url("https://example.com/") space round local 1px 2px / 3px 4px padding-box content-box, rgb(5, 6, 7) url("https://example.com/") space round local 1px 2px / 3px 4px padding-box content-box', // Firefox
+ 'url("https://example.com/") 1px 2px / 3px 4px space round local padding-box content-box, url("https://example.com/") 1px 2px / 3px 4px space round local padding-box content-box rgb(5, 6, 7)', // Blink
+ 'url(https://example.com/) 1px 2px / 3px 4px space round local padding-box content-box, url(https://example.com/) 1px 2px / 3px 4px space round local padding-box content-box rgb(5, 6, 7)' // WebKit omits quotes - https://bugs.webkit.org/show_bug.cgi?id=28869
+]);
+
+</script>
+</body>
+</html>