Force a new token chunk after a declarative shadow DOM end-tag.

This ensures that that a DSD root is always at the end of a token chunk. This is important because the parser can only yield or pause at token chunk boundaries. Pausing may be forced by a declarative Shadow DOM shadow root, if it includes a stylesheet, which blocks the HTML parser. Bug: 904966 Change-Id: Icb170b7dd15910661dd3245f6cb277d13eec0ad7 Fixed: 1203645
web-platform-tests · May 5, 2021 · 22fb0ac · 22fb0ac
1 parent 49d9c78
commit 22fb0ac
Showing 1 changed file with 39 additions and 0 deletions.
diff --git a/shadow-dom/declarative/declarative-parser-interaction.tentative.html b/shadow-dom/declarative/declarative-parser-interaction.tentative.html
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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 shadowroot="open">
+        <style>
+            @import 'non-existent.css';
+        </style>
+        <slot></slot>
+    </template>
+    <p>Line 1</p>
+</x-1>
+
+<x-2>
+    <template shadowroot="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>