Test that window.customElements is per global, not per-document

Closes whatwg/html#2578.
web-platform-tests · May 2, 2017 · 01f7065 · 01f7065
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diff --git a/common/object-association.js b/common/object-association.js
@@ -0,0 +1,64 @@
+"use strict";
+
+// For now this only has per-Window tests, but we could expand it to also test per-Document
+
+window.testIsPerWindow = propertyName => {
+  test(t => {
+    const iframe = document.createElement("iframe");
+    document.body.appendChild(iframe);
+    const frame = iframe.contentWindow;
+
+    const before = frame[propertyName];
+    assert_true(before !== undefined && before !== null, `window.${propertyName} must be implemented`);
+
+    iframe.remove();
+
+    const after = frame[propertyName];
+    assert_equals(after, before);
+  }, `Discarding the browsing context must not change window.${propertyName}`);
+
+  async_test(t => {
+    const iframe = document.createElement("iframe");
+    document.body.appendChild(iframe);
+    const frame = iframe.contentWindow;
+
+    const before = frame[propertyName];
+    assert_true(before !== undefined && before !== null, `window.${propertyName} must be implemented`);
+
+    // Note: cannot use step_func_done for this because it might be called twice, per the below comment.
+    iframe.onload = t.step_func(() => {
+      if (frame.location.href === "about:blank") {
+        // Browsers are not reliable on whether about:blank fires the load event; see
+        // https://github.com/whatwg/html/issues/490
+        return;
+      }
+
+      const after = frame[propertyName];
+      assert_equals(after, before);
+      t.done();
+    });
+
+    iframe.src = "/common/blank.html";
+  }, `Navigating from the initial about:blank must not replace window.${propertyName}`);
+
+  // Note: document.open()'s spec doesn't match most browsers; see https://github.com/whatwg/html/issues/1698.
+  // However, as explained in https://github.com/whatwg/html/issues/1698#issuecomment-298748641, even an updated spec
+  // will probably still reset Window-associated properties.
+  async_test(t => {
+    const iframe = document.createElement("iframe");
+
+    iframe.onload = t.step_func_done(() => {
+      const frame = iframe.contentWindow;
+      const before = frame[propertyName];
+      assert_true(before !== undefined && before !== null, `window.${propertyName} must be implemented`);
+
+      frame.document.open();
+
+      const after = frame[propertyName];
+      assert_not_equals(after, before);
+    });
+
+    iframe.src = "/common/blank.html";
+    document.body.appendChild(iframe);
+  }, `document.open() must replace window.${propertyName}`);
+};
diff --git a/custom-elements/custom-element-registry/per-global.html b/custom-elements/custom-element-registry/per-global.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Custom Elements: CustomElementRegistry is per global</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#custom-elements-api">
+<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
+<script src="/common/object-association.js"></script>
+
+<body>
+<script>
+"use strict";
+testIsPerWindow("customElements");
+</script>