HTML: document.open() and global variables

For whatwg/html#3651.
web-platform-tests · May 3, 2018 · 3b06a0c · 3b06a0c
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diff --git a/html/dom/dynamic-markup-insertion/opening-the-input-stream/resources/variables-frame.html b/html/dom/dynamic-markup-insertion/opening-the-input-stream/resources/variables-frame.html
@@ -0,0 +1,4 @@
+<!doctype html>
+<script>
+hey = "You";
+</script>
diff --git a/html/dom/dynamic-markup-insertion/opening-the-input-stream/variables.window.js b/html/dom/dynamic-markup-insertion/opening-the-input-stream/variables.window.js
@@ -0,0 +1,11 @@
+async_test(t => {
+  const frame = document.body.appendChild(document.createElement("iframe"));
+  frame.src = "resources/variables-frame.html";
+  frame.onload = t.step_func_done(() => {
+    assert_equals(frame.contentWindow.hey, "You", "precondition");
+    frame.contentDocument.open();
+    assert_equals(frame.contentWindow.hey, "You", "actual check");
+    // Ensure a load event gets dispatched to unblock testharness
+    frame.contentDocument.close();
+  });
+}, "Obtaining a variable from a global whose document had open() invoked");