Implement Sec-CH-Prefers-Reduced-Transparency

The `Sec-CH-Prefers-Reduced-Transparency` client hint is modeled after
the `prefers-reduced-transparency` user preference media feature as
defined in Media Queries 5.

Intent to prototype: https://groups.google.com/a/chromium.org/g/blink-dev/c/GFHrc2-lOo8

Bug: 1466423
Change-Id: I7b1e37d879dcc05b19475ba184daf28275d6ae9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4705483
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Ari Chivukula <arichiv@chromium.org>
Reviewed-by: Mike Taylor <miketaylr@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Luke <lukewarlow156@gmail.com>
Cr-Commit-Position: refs/heads/main@{#1188705}

android_webview/javatests/src/org/chromium/android_webview/test/ClientHintsTest.java

@@ -102,6 +102,7 @@ public ClientHintsTestResult(
     @SmallTest
     @Feature({"AndroidWebView"})
     @CommandLineFlags.Add({"disable-features=UserAgentClientHint",
+            "enable-features=ClientHintsPrefersReducedTransparency",
             ContentSwitches.HOST_RESOLVER_RULES + "=MAP * 127.0.0.1"})
     public void
     testAllClientHints() throws Throwable {
@@ -145,6 +146,7 @@ public ClientHintsTestResult(
                 "save-data",
                 "sec-ch-prefers-reduced-motion",
                 "sec-ch-ua-form-factor",
+                "sec-ch-prefers-reduced-transparency",
                 // Add client hints above. The final row should have a trailing comma for cleaner
                 // diffs.
         };
@@ -209,6 +211,8 @@ public ClientHintsTestResult(
         Assert.assertEquals("HEADER_NOT_FOUND", jsonObject.getString("save-data"));
         Assert.assertNotEquals("HEADER_NOT_FOUND", jsonObject.getString("sec-ch-prefers-reduced-motion"));
         Assert.assertEquals("HEADER_NOT_FOUND", jsonObject.getString("sec-ch-ua-form-factor"));
+        Assert.assertNotEquals(
+                "HEADER_NOT_FOUND", jsonObject.getString("sec-ch-prefers-reduced-transparency"));
 
         // Cleanup after test.
         clearCookies();

chrome/browser/client_hints/client_hints_browsertest.cc

@@ -106,10 +106,10 @@ using ::testing::Key;
 using ::testing::Not;
 using ::testing::Optional;
 
-constexpr unsigned expected_client_hints_number = 20u;
+constexpr unsigned expected_client_hints_number = 21u;
 constexpr unsigned expected_default_third_party_client_hints_number = 3u;
-constexpr unsigned expected_requested_third_party_client_hints_number = 23u;
-constexpr unsigned expected_pre_merge_third_party_client_hints_number = 15u;
+constexpr unsigned expected_requested_third_party_client_hints_number = 24u;
+constexpr unsigned expected_pre_merge_third_party_client_hints_number = 16u;
 
 // All of the status codes from HttpResponseHeaders::IsRedirectResponseCode.
 const net::HttpStatusCode kRedirectStatusCodes[] = {
@@ -423,7 +423,8 @@ const std::vector<network::mojom::WebClientHintsType> kStandardHTTPHeaderHints(
      network::mojom::WebClientHintsType::kViewportHeight,
      network::mojom::WebClientHintsType::kUAFullVersionList,
      network::mojom::WebClientHintsType::kUAWoW64,
-     network::mojom::WebClientHintsType::kUAFormFactor});
+     network::mojom::WebClientHintsType::kUAFormFactor,
+     network::mojom::WebClientHintsType::kPrefersReducedTransparency});
 
 const std::vector<network::mojom::WebClientHintsType>
     kStandardAcceptCHMetaHints(
@@ -487,7 +488,8 @@ const std::vector<network::mojom::WebClientHintsType>
          network::mojom::WebClientHintsType::kViewportHeight,
          network::mojom::WebClientHintsType::kUAFullVersionList,
          network::mojom::WebClientHintsType::kUAWoW64,
-         network::mojom::WebClientHintsType::kUAFormFactor});
+         network::mojom::WebClientHintsType::kUAFormFactor,
+         network::mojom::WebClientHintsType::kPrefersReducedTransparency});
 
 const std::vector<network::mojom::WebClientHintsType>
     kExtendedDelegateCHMetaHints(
@@ -511,7 +513,8 @@ const std::vector<network::mojom::WebClientHintsType>
          network::mojom::WebClientHintsType::kUAFullVersionList,
          network::mojom::WebClientHintsType::kUAWoW64,
          network::mojom::WebClientHintsType::kPrefersReducedMotion,
-         network::mojom::WebClientHintsType::kUAFormFactor});
+         network::mojom::WebClientHintsType::kUAFormFactor,
+         network::mojom::WebClientHintsType::kPrefersReducedTransparency});
 }  // namespace
 
 class ClientHintsBrowserTest : public policy::PolicyTest {
@@ -649,7 +652,7 @@ class ClientHintsBrowserTest : public policy::PolicyTest {
     // represented in the various header counts.
     feature_list->InitializeFromCommandLine(
         "UserAgentClientHint,CriticalClientHint,AcceptCHFrame,"
-        "ClientHintsFormFactor",
+        "ClientHintsFormFactor,ClientHintsPrefersReducedTransparency",
         "");
     return feature_list;
   }
@@ -1246,6 +1249,14 @@ class ClientHintsBrowserTest : public policy::PolicyTest {
         continue;
       }
 
+      // Skip over `Sec-CH-Prefers-Reduced-Transparency` when its feature is
+      // disabled
+      if (header == "sec-ch-prefers-reduced-transparency" &&
+          !base::FeatureList::IsEnabled(
+              blink::features::kClientHintsPrefersReducedTransparency)) {
+        continue;
+      }
+
       EXPECT_EQ(expect_client_hints, base::Contains(request.headers, header));
     }
   }
@@ -3321,7 +3332,9 @@ class ClientHintsWebHoldbackBrowserTest : public ClientHintsBrowserTest {
 
     std::unique_ptr<base::FeatureList> feature_list(new base::FeatureList);
     feature_list->InitializeFromCommandLine(
-        "UserAgentClientHint,ClientHintsFormFactor", "");
+        "UserAgentClientHint,ClientHintsFormFactor,"
+        "ClientHintsPrefersReducedTransparency",
+        "");
     feature_list->RegisterFieldTrialOverride(
         features::kNetworkQualityEstimatorWebHoldback.name,
         base::FeatureList::OVERRIDE_ENABLE_FEATURE, trial.get());
@@ -4016,9 +4029,15 @@ class ClientHintsBrowserTestWithEmulatedMedia
     : public DevToolsProtocolTestBase {
  public:
   ClientHintsBrowserTestWithEmulatedMedia()
+      : ClientHintsBrowserTestWithEmulatedMedia(
+            "UserAgentClientHint,AcceptCHFrame,"
+            "ClientHintsPrefersReducedTransparency",
+            "") {}
+
+  ClientHintsBrowserTestWithEmulatedMedia(const std::string& enable_features,
+                                          const std::string& disable_features)
       : https_server_(net::EmbeddedTestServer::TYPE_HTTPS) {
-    scoped_feature_list_.InitFromCommandLine(
-        "UserAgentClientHint,AcceptCHFrame", "");
+    scoped_feature_list_.InitFromCommandLine(enable_features, disable_features);
 
     https_server_.ServeFilesFromSourceDirectory(
         "chrome/test/data/client_hints");
@@ -4046,6 +4065,11 @@ class ClientHintsBrowserTestWithEmulatedMedia
       prefers_reduced_motion_observed_ =
           request.headers.at("sec-ch-prefers-reduced-motion");
     }
+    if (base::Contains(request.headers,
+                       "sec-ch-prefers-reduced-transparency")) {
+      prefers_reduced_transparency_observed_ =
+          request.headers.at("sec-ch-prefers-reduced-transparency");
+    }
   }
 
   const GURL& test_url() const { return test_url_; }
@@ -4058,6 +4082,10 @@ class ClientHintsBrowserTestWithEmulatedMedia
     return prefers_reduced_motion_observed_;
   }
 
+  const std::string& prefers_reduced_transparency_observed() const {
+    return prefers_reduced_transparency_observed_;
+  }
+
   void EmulateMedia(base::StringPiece string) {
     base::Value features = base::test::ParseJson(string);
     DCHECK(features.is_list());
@@ -4066,12 +4094,13 @@ class ClientHintsBrowserTestWithEmulatedMedia
     SendCommandSync("Emulation.setEmulatedMedia", std::move(params));
   }
 
- private:
+ protected:
   base::test::ScopedFeatureList scoped_feature_list_;
   net::EmbeddedTestServer https_server_;
   GURL test_url_;
   std::string prefers_color_scheme_observed_;
   std::string prefers_reduced_motion_observed_;
+  std::string prefers_reduced_transparency_observed_;
 };
 
 IN_PROC_BROWSER_TEST_F(ClientHintsBrowserTestWithEmulatedMedia,
@@ -4104,11 +4133,28 @@ IN_PROC_BROWSER_TEST_F(ClientHintsBrowserTestWithEmulatedMedia,
   EXPECT_EQ(prefers_reduced_motion_observed(), "no-preference");
 }
 
+IN_PROC_BROWSER_TEST_F(ClientHintsBrowserTestWithEmulatedMedia,
+                       PrefersReducedTransparency) {
+  ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), test_url()));
+  EXPECT_EQ(prefers_reduced_transparency_observed(), "");
+  Attach();
+
+  EmulateMedia(
+      R"([{"name": "prefers-reduced-transparency", "value": "reduce"}])");
+  ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), test_url()));
+  EXPECT_EQ(prefers_reduced_transparency_observed(), "reduce");
+
+  EmulateMedia(R"([{"name": "prefers-reduced-transparency", "value": ""}])");
+  ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), test_url()));
+  EXPECT_EQ(prefers_reduced_transparency_observed(), "no-preference");
+}
+
 IN_PROC_BROWSER_TEST_F(ClientHintsBrowserTestWithEmulatedMedia,
                        MultipleMediaFeatures) {
   ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), test_url()));
   EXPECT_EQ(prefers_color_scheme_observed(), "");
   EXPECT_EQ(prefers_reduced_motion_observed(), "");
+  EXPECT_EQ(prefers_reduced_transparency_observed(), "");
   Attach();
 
   EmulateMedia(
@@ -4117,11 +4163,21 @@ IN_PROC_BROWSER_TEST_F(ClientHintsBrowserTestWithEmulatedMedia,
   ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), test_url()));
   EXPECT_EQ(prefers_color_scheme_observed(), "light");
   EXPECT_EQ(prefers_reduced_motion_observed(), "reduce");
+  EXPECT_EQ(prefers_reduced_transparency_observed(), "no-preference");
+
+  EmulateMedia(
+      R"([{"name": "prefers-color-scheme", "value": "light"},
+          {"name": "prefers-reduced-transparency", "value": "reduce"}])");
+  ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), test_url()));
+  EXPECT_EQ(prefers_color_scheme_observed(), "light");
+  EXPECT_EQ(prefers_reduced_motion_observed(), "no-preference");
+  EXPECT_EQ(prefers_reduced_transparency_observed(), "reduce");
 
   EmulateMedia(R"([{"name": "prefers-color-scheme", "value": "dark"}])");
   ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), test_url()));
   EXPECT_EQ(prefers_color_scheme_observed(), "dark");
   EXPECT_EQ(prefers_reduced_motion_observed(), "no-preference");
+  EXPECT_EQ(prefers_reduced_transparency_observed(), "no-preference");
 }
 
 // Base class for the User-Agent reduction browser tests.  Common functionality
@@ -4906,3 +4962,28 @@ IN_PROC_BROWSER_TEST_F(RedirectUaReductionBrowserTest, NormalRedirectRequest) {
       base::FeatureList::IsEnabled(
           blink::features::kReduceUserAgentMinorVersion));
 }
+
+class PrefersReducedTransparencyExplicitlyDisabledBrowserTest
+    : public ClientHintsBrowserTestWithEmulatedMedia {
+ public:
+  PrefersReducedTransparencyExplicitlyDisabledBrowserTest()
+      : ClientHintsBrowserTestWithEmulatedMedia(
+            "",
+            "ClientHintsPrefersReducedTransparency") {}
+};
+
+IN_PROC_BROWSER_TEST_F(PrefersReducedTransparencyExplicitlyDisabledBrowserTest,
+                       PrefersReducedTransparencyDisabled) {
+  ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), test_url()));
+  EXPECT_EQ(prefers_reduced_transparency_observed(), "");
+  Attach();
+
+  EmulateMedia(
+      R"([{"name": "prefers-reduced-transparency", "value": "reduce"}])");
+  ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), test_url()));
+  EXPECT_EQ(prefers_reduced_transparency_observed(), "");
+
+  EmulateMedia(R"([{"name": "prefers-reduced-transparency", "value": ""}])");
+  ASSERT_TRUE(ui_test_utils::NavigateToURL(browser(), test_url()));
+  EXPECT_EQ(prefers_reduced_transparency_observed(), "");
+}

chrome/test/data/client_hints/accept_ch.html.mock-http-headers

@@ -1,2 +1,2 @@
 HTTP/1.1 200 OK
-Accept-CH: dpr,sec-ch-dpr,device-memory,sec-ch-device-memory,viewport-width,sec-ch-viewport-width,rtt,downlink,ect,sec-ch-ua-arch,sec-ch-ua-platform-version,sec-ch-ua-model,sec-ch-ua-full-version,sec-ch-prefers-color-scheme,sec-ch-prefers-reduced-motion,sec-ch-ua-bitness,sec-ch-viewport-height,sec-ch-ua-full-version-list,sec-ch-ua-wow64,sec-ch-ua-form-factor
+Accept-CH: dpr,sec-ch-dpr,device-memory,sec-ch-device-memory,viewport-width,sec-ch-viewport-width,rtt,downlink,ect,sec-ch-ua-arch,sec-ch-ua-platform-version,sec-ch-ua-model,sec-ch-ua-full-version,sec-ch-prefers-color-scheme,sec-ch-prefers-reduced-motion,sec-ch-ua-bitness,sec-ch-viewport-height,sec-ch-ua-full-version-list,sec-ch-ua-wow64,sec-ch-ua-form-factor,sec-ch-prefers-reduced-transparency

chrome/test/data/client_hints/accept_ch_img_localhost.html.mock-http-headers

@@ -1,2 +1,2 @@
 HTTP/1.1 200 OK
-Accept-CH: dpr,sec-ch-dpr,device-memory,sec-ch-device-memory,viewport-width,sec-ch-viewport-width,rtt,downlink,ect,sec-ch-ua-arch,sec-ch-ua-platform-version,sec-ch-ua-model,sec-ch-ua-full-version,sec-ch-prefers-color-scheme,sec-ch-prefers-reduced-motion,sec-ch-ua-bitness,sec-ch-viewport-height,sec-ch-ua-full-version-list,sec-ch-ua-wow64,sec-ch-ua-form-factor
+Accept-CH: dpr,sec-ch-dpr,device-memory,sec-ch-device-memory,viewport-width,sec-ch-viewport-width,rtt,downlink,ect,sec-ch-ua-arch,sec-ch-ua-platform-version,sec-ch-ua-model,sec-ch-ua-full-version,sec-ch-prefers-color-scheme,sec-ch-prefers-reduced-motion,sec-ch-ua-bitness,sec-ch-viewport-height,sec-ch-ua-full-version-list,sec-ch-ua-wow64,sec-ch-ua-form-factor,sec-ch-prefers-reduced-transparency

chrome/test/data/client_hints/http_equiv_accept_ch_delegation_bar.html

@@ -1,5 +1,5 @@
 <html>
-<meta http-equiv="Accept-CH" content="dpr=(https://bar.com/),sec-ch-dpr=(https://bar.com/),device-memory=(https://bar.com/),sec-ch-device-memory=(https://bar.com/),viewport-width=(https://bar.com/),sec-ch-viewport-width=(https://bar.com/),rtt=(https://bar.com/),downlink=(https://bar.com/),ect=(https://bar.com/),sec-ch-ua-arch=(https://bar.com/),sec-ch-ua-platform-version=(https://bar.com/),sec-ch-ua-model=(https://bar.com/),sec-ch-ua-full-version=(https://bar.com/),sec-ch-prefers-color-scheme=(https://bar.com/),sec-ch-prefers-reduced-motion=(https://bar.com/),sec-ch-ua-bitness=(https://bar.com/),sec-ch-viewport-height=(https://bar.com/),sec-ch-ua-full-version-list=(https://bar.com/),sec-ch-ua-wow64=(https://bar.com/),sec-ch-ua-form-factor=(https://bar.com/)">
+<meta http-equiv="Accept-CH" content="dpr=(https://bar.com/),sec-ch-dpr=(https://bar.com/),device-memory=(https://bar.com/),sec-ch-device-memory=(https://bar.com/),viewport-width=(https://bar.com/),sec-ch-viewport-width=(https://bar.com/),rtt=(https://bar.com/),downlink=(https://bar.com/),ect=(https://bar.com/),sec-ch-ua-arch=(https://bar.com/),sec-ch-ua-platform-version=(https://bar.com/),sec-ch-ua-model=(https://bar.com/),sec-ch-ua-full-version=(https://bar.com/),sec-ch-prefers-color-scheme=(https://bar.com/),sec-ch-prefers-reduced-motion=(https://bar.com/),sec-ch-ua-bitness=(https://bar.com/),sec-ch-viewport-height=(https://bar.com/),sec-ch-ua-full-version-list=(https://bar.com/),sec-ch-ua-wow64=(https://bar.com/),sec-ch-ua-form-factor=(https://bar.com/),sec-ch-prefers-reduced-transparency=(https://bar.com/)">
 <link rel="icon" href="data:;base64,=">
 <body>
     <img src="test_img.jpg"></img>

chrome/test/data/client_hints/http_equiv_accept_ch_delegation_foo.html

@@ -1,5 +1,5 @@
 <html>
-<meta http-equiv="Accept-CH" content="dpr=(https://foo.com/),sec-ch-dpr=(https://foo.com/),device-memory=(https://foo.com/),sec-ch-device-memory=(https://foo.com/),viewport-width=(https://foo.com/),sec-ch-viewport-width=(https://foo.com/),rtt=(https://foo.com/),downlink=(https://foo.com/),ect=(https://foo.com/),sec-ch-ua-arch=(https://foo.com/),sec-ch-ua-platform-version=(https://foo.com/),sec-ch-ua-model=(https://foo.com/),sec-ch-ua-full-version=(https://foo.com/),sec-ch-prefers-color-scheme=(https://foo.com/),sec-ch-prefers-reduced-motion=(https://foo.com/),sec-ch-ua-bitness=(https://foo.com/),sec-ch-viewport-height=(https://foo.com/),sec-ch-ua-full-version-list=(https://foo.com/),sec-ch-ua-wow64=(https://foo.com/),sec-ch-ua-form-factor=(https://foo.com/)">
+<meta http-equiv="Accept-CH" content="dpr=(https://foo.com/),sec-ch-dpr=(https://foo.com/),device-memory=(https://foo.com/),sec-ch-device-memory=(https://foo.com/),viewport-width=(https://foo.com/),sec-ch-viewport-width=(https://foo.com/),rtt=(https://foo.com/),downlink=(https://foo.com/),ect=(https://foo.com/),sec-ch-ua-arch=(https://foo.com/),sec-ch-ua-platform-version=(https://foo.com/),sec-ch-ua-model=(https://foo.com/),sec-ch-ua-full-version=(https://foo.com/),sec-ch-prefers-color-scheme=(https://foo.com/),sec-ch-prefers-reduced-motion=(https://foo.com/),sec-ch-ua-bitness=(https://foo.com/),sec-ch-viewport-height=(https://foo.com/),sec-ch-ua-full-version-list=(https://foo.com/),sec-ch-ua-wow64=(https://foo.com/),sec-ch-ua-form-factor=(https://foo.com/),sec-ch-prefers-reduced-transparency=(https://foo.com/)">
 <link rel="icon" href="data:;base64,=">
 <body>
     <img src="test_img.jpg"></img>

chrome/test/data/client_hints/http_equiv_accept_ch_delegation_merge.html

@@ -1,5 +1,5 @@
 <html>
-<meta http-equiv="Accept-CH" content="dpr=(https://bar.com/),sec-ch-dpr=(https://bar.com/),device-memory=(https://bar.com/),sec-ch-device-memory=(https://bar.com/),viewport-width=(https://bar.com/),sec-ch-viewport-width=(https://bar.com/),rtt=(https://bar.com/),downlink=(https://bar.com/),ect=(https://bar.com/),sec-ch-ua-arch=(https://bar.com/),sec-ch-ua-platform-version=(https://bar.com/),sec-ch-ua-model=(https://bar.com/),sec-ch-ua-full-version=(https://bar.com/),sec-ch-prefers-color-scheme=(https://bar.com/),sec-ch-prefers-reduced-motion=(https://bar.com/),sec-ch-ua-bitness=(https://bar.com/),sec-ch-viewport-height=(https://bar.com/),sec-ch-ua-full-version-list=(https://bar.com/),sec-ch-ua-wow64=(https://bar.com/),sec-ch-ua-form-factor=(https://bar.com/)">
+<meta http-equiv="Accept-CH" content="dpr=(https://bar.com/),sec-ch-dpr=(https://bar.com/),device-memory=(https://bar.com/),sec-ch-device-memory=(https://bar.com/),viewport-width=(https://bar.com/),sec-ch-viewport-width=(https://bar.com/),rtt=(https://bar.com/),downlink=(https://bar.com/),ect=(https://bar.com/),sec-ch-ua-arch=(https://bar.com/),sec-ch-ua-platform-version=(https://bar.com/),sec-ch-ua-model=(https://bar.com/),sec-ch-ua-full-version=(https://bar.com/),sec-ch-prefers-color-scheme=(https://bar.com/),sec-ch-prefers-reduced-motion=(https://bar.com/),sec-ch-ua-bitness=(https://bar.com/),sec-ch-viewport-height=(https://bar.com/),sec-ch-ua-full-version-list=(https://bar.com/),sec-ch-ua-wow64=(https://bar.com/),sec-ch-ua-form-factor=(https://bar.com/),sec-ch-prefers-reduced-transparency=(https://bar.com/)">
 <link rel="icon" href="data:;base64,=">
 <body>
     <img src="test_img.jpg"></img>

chrome/test/data/client_hints/http_equiv_accept_ch_delegation_merge.html.mock-http-headers

@@ -1,3 +1,3 @@
 HTTP/1.1 200 OK
-Accept-CH: dpr,sec-ch-dpr,device-memory,sec-ch-device-memory,viewport-width,sec-ch-viewport-width,rtt,downlink,ect,sec-ch-ua-arch,sec-ch-ua-platform-version,sec-ch-ua-model,sec-ch-ua-full-version,sec-ch-prefers-color-scheme,sec-ch-prefers-reduced-motion,sec-ch-ua-bitness,sec-ch-viewport-height,sec-ch-ua-full-version-list,sec-ch-ua-wow64,sec-ch-ua-form-factor
-Permissions-Policy: ch-dpr=(*),ch-device-memory=(self "https://foo.com/"),ch-viewport-width=(*),ch-rtt=(self "https://foo.com/"),ch-downlink=(*),ch-ect=(self "https://foo.com/"),ch-ua-arch=(*),ch-ua-platform-version=(self "https://foo.com/"),ch-ua-model=(*),ch-ua-full-version=(self "https://foo.com/"),ch-prefers-color-scheme=(*),ch-prefers-reduced-motion=(*),ch-ua-bitness=(self "https://foo.com/"),ch-viewport-height=(*),ch-ua-full-version-list=(self "https://foo.com/"),ch-ua-wow64=(*),ch-ua-form-factor=(*)
+Accept-CH: dpr,sec-ch-dpr,device-memory,sec-ch-device-memory,viewport-width,sec-ch-viewport-width,rtt,downlink,ect,sec-ch-ua-arch,sec-ch-ua-platform-version,sec-ch-ua-model,sec-ch-ua-full-version,sec-ch-prefers-color-scheme,sec-ch-prefers-reduced-motion,sec-ch-ua-bitness,sec-ch-viewport-height,sec-ch-ua-full-version-list,sec-ch-ua-wow64,sec-ch-ua-form-factor,sec-ch-prefers-reduced-transparency
+Permissions-Policy: ch-dpr=(*),ch-device-memory=(self "https://foo.com/"),ch-viewport-width=(*),ch-rtt=(self "https://foo.com/"),ch-downlink=(*),ch-ect=(self "https://foo.com/"),ch-ua-arch=(*),ch-ua-platform-version=(self "https://foo.com/"),ch-ua-model=(*),ch-ua-full-version=(self "https://foo.com/"),ch-prefers-color-scheme=(*),ch-prefers-reduced-motion=(*),ch-ua-bitness=(self "https://foo.com/"),ch-viewport-height=(*),ch-ua-full-version-list=(self "https://foo.com/"),ch-ua-wow64=(*),ch-ua-form-factor=(*),ch-prefers-reduced-transparency=(*)