layout/style/test/test_non_content_accessible_env_vars.html


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<!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_ENV_VARS = [
  "-moz-gtk-csd-titlebar-radius",
  "-moz-gtk-csd-minimize-button-position",
  "-moz-gtk-csd-maximize-button-position",
  "-moz-gtk-csd-close-button-position",
  "-moz-content-preferred-color-scheme",
  "-moz-overlay-scrollbar-fade-duration",
  "scrollbar-inline-size",
];

function testInWin(win) {
  let doc = win.document;
  const div = doc.createElement("div");
  doc.documentElement.appendChild(div);
  for (const envVar of NON_CONTENT_ACCESSIBLE_ENV_VARS) {
    div.style.setProperty("--foo", `env(${envVar},FALLBACK_VALUE)`);

    assert_equals(
      win.getComputedStyle(div).getPropertyValue("--foo"),
      "FALLBACK_VALUE",
      `${envVar} shouldn't be exposed to content in ${doc.documentURI}`
    );
  }
}

let t = async_test("Test non-content-accessible env() vars");
onload = t.step_func_done(function() {
  testInWin(window);
  for (let f of document.querySelectorAll("iframe")) {
    testInWin(f.contentWindow);
  }
});
</script>