1 files changed, 78 insertions, 0 deletions
diff --git a/layout/style/test/test_non_content_accessible_properties.html b/layout/style/test/test_non_content_accessible_properties.html
new file mode 100644
index 0000000000..0b3e22981f
--- /dev/null
+++ b/layout/style/test/test_non_content_accessible_properties.html
@@ -0,0 +1,78 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<iframe></iframe>
+<iframe srcdoc="Foo"></iframe>
+<script>
+const NON_CONTENT_ACCESSIBLE_PROPERTIES = [
+  "-x-span",
+  "-x-lang",
+  "-x-text-scale",
+  "-moz-window-input-region-margin",
+  "-moz-window-shadow",
+  "-moz-window-opacity",
+  "-moz-window-transform",
+  "-moz-window-transform-origin",
+  "-moz-top-layer",
+  "-moz-script-size-multiplier",
+  "-moz-script-level",
+  "-moz-math-display",
+  "-moz-math-variant",
+  "-moz-script-min-size",
+  "-moz-font-smoothing-background-color",
+  "-moz-min-font-size-ratio",
+  "-moz-script-size-multiplier",
+  "-moz-default-appearance",
+  "-moz-inert",
+  "-moz-control-character-visibility",
+  "-moz-context-properties",
+];
+
+function testInWin(win) {
+  const doc = win.document;
+  const sheet = doc.createElement("style");
+  const div = doc.createElement("div");
+  doc.documentElement.appendChild(sheet);
+  doc.documentElement.appendChild(div);
+
+  sheet.textContent = `div { color: initial }`;
+  assert_equals(sheet.sheet.cssRules[0].style.length, 1, `sanity: ${doc.documentURI}`);
+
+  for (const prop of NON_CONTENT_ACCESSIBLE_PROPERTIES) {
+    sheet.textContent = `div { ${prop}: initial }`;
+    let block = sheet.sheet.cssRules[0].style;
+    assert_equals(
+      block.length,
+      0,
+      `${prop} shouldn't be parsed in ${doc.documentURI}`
+    );
+    block.setProperty(prop, "initial");
+    assert_equals(
+      block.length,
+      0,
+      `${prop} shouldn't be settable via CSSOM in ${doc.documentURI}`
+    );
+    assert_equals(
+      win.getComputedStyle(div).getPropertyValue(prop),
+      "",
+      `${prop} shouldn't be accessible via CSSOM in ${doc.documentURI}`
+    );
+    assert_false(
+      win.CSS.supports(prop + ': initial'),
+      `${prop} shouldn't be exposed in CSS.supports in ${doc.documentURI}`
+    );
+    assert_false(
+      win.CSS.supports(prop, 'initial'),
+      `${prop} shouldn't be exposed in CSS.supports in ${doc.documentURI} (2-value version)`
+    );
+  }
+}
+
+let t = async_test("test non-content-accessible props");
+onload = t.step_func_done(function() {
+  testInWin(window);
+  for (let f of document.querySelectorAll("iframe")) {
+    testInWin(f.contentWindow);
+  }
+});
+</script>