diff --git a/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-is-popup-condition.html b/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-is-popup-condition.html
index 3959b618e1d0bab..4f52e2e8de64fd5 100644
--- a/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-is-popup-condition.html
+++ b/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-is-popup-condition.html
@@ -26,48 +26,59 @@
     // The explicit popup feature.
     ["popup", false],
     ["popup=1", false],
+    ["popup=true", false],
     ["popup=0", true],
 
     // Other feature alone results in popup.
     ["location", false],
     ["location=yes", false],
+    ["location=true", false],
     ["location=no", false],
 
     ["toolbar", false],
     ["toolbar=yes", false],
+    ["toolbar=true", false],
     ["toolbar=no", false],
 
     ["menubar", false],
     ["menubar=yes", false],
+    ["menubar=true", false],
     ["menubar=no", false],
 
     ["resizable", false],
     ["resizable=yes", false],
+    ["resizable=true", false],
     ["resizable=no", false],
   ],
   "single-2": [
     ["scrollbars", false],
     ["scrollbars=yes", false],
+    ["scrollbars=true", false],
     ["scrollbars=no", false],
 
     ["status", false],
     ["status=yes", false],
+    ["status=true", false],
     ["status=no", false],
 
     ["titlebar", false],
     ["titlebar=yes", false],
+    ["titlebar=true", false],
     ["titlebar=no", false],
 
     ["close", false],
     ["close=yes", false],
+    ["close=true", false],
     ["close=no", false],
 
     ["minimizable", false],
     ["minimizable=yes", false],
+    ["minimizable=true", false],
     ["minimizable=no", false],
 
     ["personalbar", false],
     ["personalbar=yes", false],
+    ["personalbar=true", false],
     ["personalbar=no", false],
   ],
   "position": [
@@ -113,6 +124,8 @@
 
     // The explicit popup feature has priority than others.
     ["popup=1,location,toolbar,menubar,resizable,scrollbars,status", false],
+    ["popup=yes,location,toolbar,menubar,resizable,scrollbars,status", false],
+    ["popup=true,location,toolbar,menubar,resizable,scrollbars,status", false],
     ["popup=0,location,toolbar,menubar,resizable,scrollbars", true],
   ],
 };
diff --git a/html/browsers/the-window-object/support/windowFeature-values-target.html b/html/browsers/the-window-object/support/windowFeature-values-target.html
new file mode 100644
index 000000000000000..3a78ddf660544a7
--- /dev/null
+++ b/html/browsers/the-window-object/support/windowFeature-values-target.html
@@ -0,0 +1,24 @@
+<script>
+  const channelName = location.search.substr(1),
+        channel = new BroadcastChannel(channelName);
+
+  const haveOpener = window.opener !== null;
+  const haveReferrer = document.referrer !== null && document.referrer !== "";
+  const allBarProps = [
+    window.locationbar.visible,
+    window.menubar.visible,
+    window.personalbar.visible,
+    window.scrollbars.visible,
+    window.statusbar.visible,
+    window.toolbar.visible
+  ];
+  const isPopup = allBarProps.every(x=>!x);
+
+  channel.postMessage({haveOpener, haveReferrer, isPopup});
+
+  // Because messages are not delivered synchronously and because closing a
+  // browsing context prompts the eventual clearing of all task sources, this
+  // document should not be closed until the opener document has confirmed
+  // receipt.
+  channel.onmessage = () => window.close();
+</script>
diff --git a/html/browsers/the-window-object/window-open-noopener.html b/html/browsers/the-window-object/window-open-noopener.html
index c3c706605492c5c..8d3a95df630eaee 100644
--- a/html/browsers/the-window-object/window-open-noopener.html
+++ b/html/browsers/the-window-object/window-open-noopener.html
@@ -18,6 +18,9 @@
   { testDescription: "noopener=1 means the same as noopener",
     secondWindowFeatureString: "noopener=1",
     shouldReturnWindow: false },
+  { testDescription: "noopener=true means the same as noopener",
+    secondWindowFeatureString: "noopener=true",
+    shouldReturnWindow: false },
   { testDescription: "noopener=0 means lack of noopener",
     secondWindowFeatureString: "noopener=0",
     shouldReturnWindow: true },
diff --git a/html/browsers/the-window-object/window-open-windowfeatures-values.html b/html/browsers/the-window-object/window-open-windowfeatures-values.html
new file mode 100644
index 000000000000000..32551dd8d70f1e1
--- /dev/null
+++ b/html/browsers/the-window-object/window-open-windowfeatures-values.html
@@ -0,0 +1,72 @@
+<!doctype html>
+<meta charset=utf-8>
+<meta name="timeout" content="long">
+<title>window.open() windowFeature value parsing</title>
+<link rel="author" href="mailto:masonf@chromium.org">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/window-object.html#concept-window-open-features-parse-boolean">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+function testValueGeneric(val, expectTrue, property, testFn) {
+  const windowFeatureStr = val === "" ? property : `${property}=${val}`;
+  async_test(t => {
+    const windowName = '' + Math.round(Math.random()*1e12);
+    const channel = new BroadcastChannel(windowName);
+    channel.onmessage = t.step_func_done(e => {
+      // Send message first so if asserts throw the popup is still closed
+      channel.postMessage(null);
+      testFn(e.data);
+    });
+    window.open("support/windowFeature-values-target.html?" + windowName, windowName, windowFeatureStr);
+  },`Test ${windowFeatureStr}, expected interpretation is ${expectTrue ? 'true' : 'false'}`);
+}
+
+function testValueForNoReferrer(val, expectTrue) {
+  testValueGeneric(val, expectTrue, "noreferrer", (data) => {
+    if (expectTrue) {
+      assert_false(data.haveReferrer);
+      assert_false(data.haveOpener);
+    } else {
+      assert_true(data.haveReferrer);
+      assert_true(data.haveOpener);
+    }
+  });
+}
+
+function testValueForNoOpener(val, expectTrue) {
+  testValueGeneric(val, expectTrue, "noopener", (data) => {
+    assert_equals(data.haveOpener, !expectTrue);
+  });
+}
+
+function testValueForPopup(val, expectTrue) {
+  testValueGeneric(val, expectTrue, "popup", (data) => {
+    assert_equals(data.isPopup, expectTrue);
+  });
+}
+
+function testValue(val, expectTrue) {
+  const quotes = val === "" ? [''] : ['','"',"'"];
+  let noQuotes = true;
+  for (const quote of quotes) {
+    const thisExpectTrue = expectTrue && noQuotes;
+    const thisVal = quote + val + quote;
+    testValueForNoReferrer(thisVal, thisExpectTrue);
+    testValueForNoOpener(thisVal, thisExpectTrue);
+    testValueForPopup(thisVal, thisExpectTrue);
+    noQuotes = false;
+  }
+}
+
+testValue('',true); // Just the parameter means true
+testValue('yes',true); // Yes means true
+testValue('true',true); // True means true
+testValue('foo',false); // If parsing as an integer is an error, false
+testValue('0',false);   // 0 is false
+testValue('00',false);  // 0 is false
+testValue('1',true);    // Non-zero is true
+testValue('99999',true);    // Non-zero is true
+testValue('-1',true);    // Non-zero is true
+testValue('1foo',true); // This parses to 1
+testValue('0foo',false); // This parses to 0
+</script>