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test/fixtures/wpt/wasm/jsapi/functions/entry-different-function-realm.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Entry settings object for host functions when the function realm is different from the test realm</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/wasm/jsapi/wasm-module-builder.js"></script>
+<script src="/wasm/jsapi/functions/helper.js"></script>
+
+<!-- This is what would normally be considered the entry page. However, we use functions from the
+     resources/function/function.html realm. So window.open() should resolve relative to that realm
+     inside host functions. -->
+
+<iframe src="resources/entry-incumbent.html"></iframe>
+<iframe src="resources/function/function.html" id="function-frame"></iframe>
+
+<script>
+setup({ explicit_done: true });
+
+const relativeURL = "resources/window-to-open.html";
+const expectedURL = (new URL(relativeURL, document.querySelector("#function-frame").src)).href;
+
+const incumbentWindow = frames[0];
+const functionWindow = frames[1];
+const FunctionFromAnotherWindow = functionWindow.Function;
+
+window.onload = () => {
+  async_test(t => {
+    t.add_cleanup(() => { delete functionWindow.args; });
+    functionWindow.args = [incumbentWindow, relativeURL, t, assert_equals, expectedURL];
+
+    const func = FunctionFromAnotherWindow(`
+      const [incumbentWindow, relativeURL, t, assert_equals, expectedURL] = window.args;
+
+      const w = incumbentWindow.runWindowOpenVeryIndirectly(relativeURL);
+      w.onload = t.step_func_done(() => {
+        t.add_cleanup(() => w.close());
+        assert_equals(w.location.href, expectedURL);
+      });
+    `);
+    call_later(func);
+  }, "Start function");
+
+  done();
+};
+</script>

test/fixtures/wpt/wasm/jsapi/functions/entry.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Entry settings object for host functions</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/wasm/jsapi/wasm-module-builder.js"></script>
+<script src="/wasm/jsapi/functions/helper.js"></script>
+
+<!-- This is the entry page, so window.open() should resolve relative to it, even inside host functions. -->
+
+<iframe src="resources/entry-incumbent.html"></iframe>
+
+<script>
+setup({ explicit_done: true });
+
+const relativeURL = "resources/window-to-open.html";
+const expectedURL = (new URL(relativeURL, location.href)).href;
+
+const incumbentWindow = frames[0];
+
+window.onload = () => {
+  async_test(t => {
+    const w = incumbentWindow.runWindowOpenVeryIndirectly(relativeURL);
+    w.onload = t.step_func_done(() => {
+      t.add_cleanup(() => w.close());
+      assert_equals(w.location.href, expectedURL);
+    });
+  }, "Sanity check: this all works as expected synchronously");
+
+  async_test(t => {
+    // No t.step_func because that could change the realms
+    call_later(() => {
+      const w = incumbentWindow.runWindowOpenVeryIndirectly(relativeURL);
+      w.onload = t.step_func_done(() => {
+        t.add_cleanup(() => w.close());
+        assert_equals(w.location.href, expectedURL);
+      });
+    });
+  }, "Start function");
+
+  done();
+};
+</script>

test/fixtures/wpt/wasm/jsapi/functions/helper.js

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+function call_later(f) {
+  const builder = new WasmModuleBuilder();
+  const functionIndex = builder.addImport("module", "imported", kSig_v_v);
+  builder.addStart(functionIndex);
+  const buffer = builder.toBuffer();
+
+  WebAssembly.instantiate(buffer, {
+    "module": {
+      "imported": f,
+    }
+  });
+}

test/fixtures/wpt/wasm/jsapi/functions/incumbent.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Incumbent settings object for host functions</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<!-- This is the entry page. -->
+
+<iframe src="resources/incumbent-incumbent.html"></iframe>
+
+<script>
+setup({ explicit_done: true });
+
+// postMessage should pick the incumbent page as its .source value to set on the MessageEvent, even
+// inside host functions.
+const expectedURL = (new URL("resources/incumbent-incumbent.html", location.href)).href;
+
+let testId = 0;
+
+window.onload = () => {
+  const relevantWindow = frames[0].document.querySelector("#r").contentWindow;
+
+  function setupTest(t) {
+    ++testId;
+    const thisTestId = testId;
+
+    relevantWindow.addEventListener("messagereceived", t.step_func(e => {
+      const [receivedTestId, receivedSourceURL] = e.detail;
+
+      if (receivedTestId !== thisTestId) {
+        return;
+      }
+
+      assert_equals(receivedSourceURL, expectedURL);
+      t.done();
+    }));
+
+    return thisTestId;
+  }
+
+  async_test(t => {
+    const thisTestId = setupTest(t);
+
+    frames[0].runWindowPostMessageVeryIndirectly(thisTestId, "*");
+  }, "Sanity check: this all works as expected synchronously");
+
+  async_test(t => {
+    const thisTestId = setupTest(t);
+    frames[0].runWindowPostMessageVeryIndirectlyWithNoUserCode(thisTestId, "*");
+  }, "Start function");
+
+  done();
+};
+</script>

test/fixtures/wpt/wasm/jsapi/functions/resources/README.md

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+A couple notes about the files scattered in this `resources/` directory:
+
+* The nested directory structure is necessary here so that relative URL resolution can be tested; we need different sub-paths for each document.
+
+* The semi-duplicate `window-to-open.html`s scattered throughout are present because Firefox, at least, does not fire `Window` `load` events for 404s, so we want to ensure that no matter which global is used, `window`'s `load` event is hit and our tests can proceed.

test/fixtures/wpt/wasm/jsapi/functions/resources/current/current.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Current page used as a test helper</title>
+

test/fixtures/wpt/wasm/jsapi/functions/resources/current/resources/window-to-open.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>If the current settings object is used this page will be opened</title>

test/fixtures/wpt/wasm/jsapi/functions/resources/entry-incumbent.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Incumbent page used as a test helper</title>
+
+<iframe src="relevant/relevant.html" id="r"></iframe>
+<iframe src="current/current.html" id="c"></iframe>
+
+<script>
+const relevant = document.querySelector("#r");
+const current = document.querySelector("#c");
+
+window.runWindowOpenVeryIndirectly = (...args) => {
+  return current.contentWindow.open.call(relevant.contentWindow, ...args);
+};
+</script>

test/fixtures/wpt/wasm/jsapi/functions/resources/function/function.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Realm for a host function used as a test helper</title>

test/fixtures/wpt/wasm/jsapi/functions/resources/function/resources/window-to-open.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>If the function's settings object is used this page will be opened</title>

test/fixtures/wpt/wasm/jsapi/functions/resources/incumbent-incumbent.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Incumbent page used as a test helper</title>
+
+<script src="/wasm/jsapi/wasm-module-builder.js"></script>
+<script src="/wasm/jsapi/functions/helper.js"></script>
+
+<iframe src="relevant/relevant.html" id="r"></iframe>
+<iframe src="current/current.html" id="c"></iframe>
+
+<script>
+const relevant = document.querySelector("#r");
+const current = document.querySelector("#c");
+
+window.runWindowPostMessageVeryIndirectly = (...args) => {
+  return current.contentWindow.postMessage.call(relevant.contentWindow, ...args);
+};
+
+// This tests the backup incumbent settings object stack scenario, by avoiding putting user code on the stack.
+window.runWindowPostMessageVeryIndirectlyWithNoUserCode = (...args) => {
+  const runWindowPostMessage = current.contentWindow.postMessage.bind(relevant.contentWindow, ...args);
+  call_later(runWindowPostMessage);
+};
+</script>

test/fixtures/wpt/wasm/jsapi/functions/resources/relevant/relevant.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Relevant page used as a test helper</title>
+
+<script>
+// incumbent.html will end up posting a message to here. We need to signal back the "source".
+
+window.onmessage = e => {
+  const testId = e.data;
+  const sourceURL = e.source.document.URL;
+
+  window.dispatchEvent(new CustomEvent("messagereceived", { detail: [testId, sourceURL] }));
+};
+</script>

test/fixtures/wpt/wasm/jsapi/functions/resources/relevant/resources/window-to-open.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>If the relevant settings object is used this page will be opened</title>

test/fixtures/wpt/wasm/jsapi/functions/resources/resources/window-to-open.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>If the incumbent settings object is used this page will be opened</title>

test/fixtures/wpt/wasm/jsapi/functions/resources/window-to-open.html

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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>If the entry settings object is used this page will be opened</title>