diff --git a/scripts/build/deps/webkit.ts b/scripts/build/deps/webkit.ts
index f8c9ad85d811..4cb37cd59b1e 100644
--- a/scripts/build/deps/webkit.ts
+++ b/scripts/build/deps/webkit.ts
@@ -3,7 +3,7 @@
  * for local mode. Override via `--webkit-version=<hash>` to test a branch.
  * From https://github.com/oven-sh/WebKit releases.
  */
-export const WEBKIT_VERSION = "eeab04040fa61fd595695980f9d054b7fc0ed855";
+export const WEBKIT_VERSION = "autobuild-preview-pr-460-8da5349b";
 
 /**
  * WebKit (JavaScriptCore) — the JS engine.
diff --git a/test/js/web/url/url.test.ts b/test/js/web/url/url.test.ts
index 41ba8ec9ee37..6b45584e8cd5 100755
--- a/test/js/web/url/url.test.ts
+++ b/test/js/web/url/url.test.ts
@@ -323,6 +323,121 @@ describe("url", () => {
 }`);
     // A path whose first segment merely starts with "." gets no guard.
     expect(util.inspect(new URL("foo:/.foo"), { showHidden: true })).toContain("pathname_start: 4,");
+    // search_start is derived from the pathname's length, so it is only right if the pathname getter keeps the "/.".
+    const inspected = util.inspect(new URL("foo:/.foo?x"), { showHidden: true });
+    expect(inspected).toContain("pathname: '/.foo',");
+    expect(inspected).toContain("pathname_start: 4,");
+    expect(inspected).toContain("search_start: 9,");
+  });
+
+  // URL Standard section 4.5 step 3: a URL with a null host serializes a path whose first segment is empty with a "/."
+  // guard in front of it (foo:/.//b), and the pathname getter leaves that guard out. The guard is only ever in front of
+  // "//"; a first segment that merely starts with "." (foo:/.a, git:/.git/config) is part of the pathname.
+  describe("pathname of a host-less URL whose first segment starts with a dot", () => {
+    const pathnames = (inputs: string[]) => Object.fromEntries(inputs.map(input => [input, new URL(input).pathname]));
+
+    it("keeps the dotted first segment", () => {
+      expect(
+        pathnames([
+          "foo:/.a/b",
+          "git:/.git/config",
+          "myapp:/.well-known/assetlinks.json",
+          "foo:/..a",
+          "foo:/.a",
+          "foo:/.a?q#f",
+          "foo:/.%2Fa",
+          "foo:/.a//b",
+          "foo:/./.a",
+        ]),
+      ).toEqual({
+        "foo:/.a/b": "/.a/b",
+        "git:/.git/config": "/.git/config",
+        "myapp:/.well-known/assetlinks.json": "/.well-known/assetlinks.json",
+        "foo:/..a": "/..a",
+        "foo:/.a": "/.a",
+        "foo:/.a?q#f": "/.a",
+        "foo:/.%2Fa": "/.%2Fa",
+        "foo:/.a//b": "/.a//b",
+        "foo:/./.a": "/.a",
+      });
+    });
+
+    it("still omits the /. guard and normalizes dot segments", () => {
+      expect(
+        pathnames([
+          "foo:/.//b",
+          "foo:/..//b",
+          "foo:/.//.a",
+          "foo:/./b",
+          "foo:/.",
+          "foo://h/.a",
+          "foo:///.a",
+          "https://h/.a",
+          "file:/.a",
+        ]),
+      ).toEqual({
+        "foo:/.//b": "//b",
+        "foo:/..//b": "//b",
+        "foo:/.//.a": "//.a",
+        "foo:/./b": "/b",
+        "foo:/.": "/",
+        "foo://h/.a": "/.a",
+        "foo:///.a": "/.a",
+        "https://h/.a": "/.a",
+        "file:/.a": "/.a",
+      });
+      expect(new URL("foo:/.//b").href).toBe("foo:/.//b");
+      expect(new URL("foo:/.a/b").href).toBe("foo:/.a/b");
+    });
+
+    it("resolves relative references against such a URL", () => {
+      const resolve = (input: string, base: string) => {
+        const url = new URL(input, base);
+        return { href: url.href, pathname: url.pathname };
+      };
+      expect({
+        "x against foo:/.a/b": resolve("x", "foo:/.a/b"),
+        "../y against foo:/.a/b/c": resolve("../y", "foo:/.a/b/c"),
+        "/.a against foo:/.//b": resolve("/.a", "foo:/.//b"),
+        "//b against foo:/.a": resolve("//b", "foo:/.a"),
+      }).toEqual({
+        "x against foo:/.a/b": { href: "foo:/.a/x", pathname: "/.a/x" },
+        "../y against foo:/.a/b/c": { href: "foo:/.a/y", pathname: "/.a/y" },
+        "/.a against foo:/.//b": { href: "foo:/.a", pathname: "/.a" },
+        "//b against foo:/.a": { href: "foo://b", pathname: "" },
+      });
+    });
+
+    it("setters", () => {
+      const set = (input: string, property: "pathname" | "host" | "search" | "protocol", value: string) => {
+        const url = new URL(input);
+        url[property] = value;
+        return { href: url.href, host: url.host, pathname: url.pathname };
+      };
+      expect({
+        "foo:/x pathname=/.a/b": set("foo:/x", "pathname", "/.a/b"),
+        "foo:/.a pathname=/b": set("foo:/.a", "pathname", "/b"),
+        "foo:/.a pathname=//b": set("foo:/.a", "pathname", "//b"),
+        "foo:/.//b pathname=/.c": set("foo:/.//b", "pathname", "/.c"),
+        "foo:/.a search=?x": set("foo:/.a", "search", "?x"),
+        "foo:/.a protocol=bar": set("foo:/.a", "protocol", "bar"),
+        "foo:/.a host=h": set("foo:/.a", "host", "h"),
+        "foo:/.a host=h:1": set("foo:/.a", "host", "h:1"),
+        "foo:/.//b host=h": set("foo:/.//b", "host", "h"),
+        "foo:/.//b host=h:1": set("foo:/.//b", "host", "h:1"),
+      }).toEqual({
+        "foo:/x pathname=/.a/b": { href: "foo:/.a/b", host: "", pathname: "/.a/b" },
+        "foo:/.a pathname=/b": { href: "foo:/b", host: "", pathname: "/b" },
+        "foo:/.a pathname=//b": { href: "foo:/.//b", host: "", pathname: "//b" },
+        "foo:/.//b pathname=/.c": { href: "foo:/.c", host: "", pathname: "/.c" },
+        "foo:/.a search=?x": { href: "foo:/.a?x", host: "", pathname: "/.a" },
+        "foo:/.a protocol=bar": { href: "bar:/.a", host: "", pathname: "/.a" },
+        "foo:/.a host=h": { href: "foo://h/.a", host: "h", pathname: "/.a" },
+        "foo:/.a host=h:1": { href: "foo://h:1/.a", host: "h:1", pathname: "/.a" },
+        "foo:/.//b host=h": { href: "foo://h//b", host: "h", pathname: "//b" },
+        "foo:/.//b host=h:1": { href: "foo://h:1//b", host: "h:1", pathname: "//b" },
+      });
+    });
   });
   it("works", () => {
     const inputs = [
diff --git a/test/js/web/urlpattern/urlpattern.test.ts b/test/js/web/urlpattern/urlpattern.test.ts
index c2a727ab5b15..854587f14bf1 100644
--- a/test/js/web/urlpattern/urlpattern.test.ts
+++ b/test/js/web/urlpattern/urlpattern.test.ts
@@ -161,6 +161,81 @@ describe("URLPattern", () => {
     });
   });
 
+  // For a non-special scheme, the pathname is canonicalized by parsing it as the path of a host-less dummy URL and
+  // reading the pathname back, so a first segment starting with "." must survive that round trip (see the URL tests
+  // for the "/." guard that a host-less URL serializes in front of a path starting with "//").
+  describe("non-special scheme with a pathname whose first segment starts with a dot", () => {
+    test("constructor string with a host", () => {
+      const pattern = new URLPattern("myapp://host/.well-known/:file");
+      expect(pattern.pathname).toBe("/.well-known/:file");
+      expect(pattern.test("myapp://host/.well-known/assetlinks.json")).toBe(true);
+      expect(pattern.exec("myapp://host/.well-known/assetlinks.json")!.pathname).toEqual({
+        input: "/.well-known/assetlinks.json",
+        groups: { file: "assetlinks.json" },
+      });
+      expect(pattern.test("myapp://host/well-known/assetlinks.json")).toBe(false);
+    });
+
+    test("wildcard after the dotted segment", () => {
+      const pattern = new URLPattern("git://h/.git/:rest*");
+      expect(pattern.pathname).toBe("/.git/:rest*");
+      expect(pattern.test("git://h/.git/config")).toBe(true);
+      expect(pattern.exec("git://h/.git/refs/heads/main")!.pathname.groups).toEqual({ rest: "refs/heads/main" });
+    });
+
+    test("URLPatternInit", () => {
+      expect({
+        wellKnown: new URLPattern({ protocol: "myapp", pathname: "/.well-known/*" }).pathname,
+        doubleDot: new URLPattern({ protocol: "myapp", pathname: "/..a" }).pathname,
+        dotSlashSlash: new URLPattern({ protocol: "myapp", pathname: "/.//a" }).pathname,
+        laterSegment: new URLPattern({ protocol: "myapp", pathname: "/x/.a" }).pathname,
+      }).toEqual({
+        wellKnown: "/.well-known/*",
+        doubleDot: "/..a",
+        dotSlashSlash: "//a",
+        laterSegment: "/x/.a",
+      });
+      const pattern = new URLPattern({ protocol: "foo", pathname: "/.a" });
+      expect(pattern.test("foo:/.a")).toBe(true);
+      expect(pattern.test("foo://h/.a")).toBe(true);
+      expect(pattern.test({ protocol: "foo", pathname: "/.a" })).toBe(true);
+      expect(pattern.test("foo:/a")).toBe(false);
+    });
+
+    test("baseURL", () => {
+      expect({
+        relativeString: new URLPattern("./c", "foo://h/.a/b").pathname,
+        relativeInit: new URLPattern({ pathname: "c", baseURL: "foo:/.a/b" }).pathname,
+        inheritedFromBase: new URLPattern({ baseURL: "foo:/.a/b" }).pathname,
+      }).toEqual({
+        relativeString: "/.a/c",
+        relativeInit: "/.a/c",
+        inheritedFromBase: "/.a/b",
+      });
+    });
+
+    test("the matched input reports the full pathname", () => {
+      expect(new URLPattern({ protocol: "foo" }).exec("foo:/.a/b")!.pathname).toEqual({
+        input: "/.a/b",
+        groups: { "0": "/.a/b" },
+      });
+    });
+
+    test("unaffected patterns", () => {
+      expect({
+        special: new URLPattern("https://h/.well-known/:file").pathname,
+        noProtocol: new URLPattern({ pathname: "/.well-known/*" }).pathname,
+        hostAndLaterSegment: new URLPattern("foo://h/x/.b").pathname,
+      }).toEqual({
+        special: "/.well-known/:file",
+        noProtocol: "/.well-known/*",
+        hostAndLaterSegment: "/x/.b",
+      });
+      expect(new URLPattern("https://h/.well-known/:file").test("https://h/.well-known/x")).toBe(true);
+      expect(new URLPattern("foo://h/x/.b").test("foo://h/x/.b")).toBe(true);
+    });
+  });
+
   describe("hasRegExpGroups", () => {
     test("match-everything pattern", () => {
       expect(new URLPattern({}).hasRegExpGroups).toBe(false);