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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Declarative Shadow DOM</title>
+<link rel="author" href="mailto:masonf@chromium.org">
+<link rel="help" href="https://github.com/whatwg/dom/issues/831">
+<link rel="help" href="https://crbug.com/1203645">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="support/helpers.js"></script>
+
+
+This test should not crash, and there should be two lines of text visible below.
+<x-1>
+ <template shadowrootmode="open">
+ <style>
+ @import 'non-existent.css';
+ </style>
+ <slot></slot>
+ </template>
+ <p>Line 1</p>
+</x-1>
+
+<x-2>
+ <template shadowrootmode="open">
+ <slot></slot>
+ </template>
+ <p>Line 2</p>
+</x-2>
+
+<script>
+ window.onload = function() {
+ const x1 = document.querySelector('x-1');
+ const x2 = document.querySelector('x-2');
+ test(() => {
+ assert_true(!!x1);
+ assert_true(!!x2);
+ }, 'Declarative Shadow DOM: Test for crashes and improper parsing');
+ }
+</script>