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Test Info:

<!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>