diff --git a/scripts/get-latest-platform-tests.js b/scripts/get-latest-platform-tests.js
index 9d90ea9..5ec2d14 100644
--- a/scripts/get-latest-platform-tests.js
+++ b/scripts/get-latest-platform-tests.js
@@ -19,7 +19,7 @@ process.on("unhandledRejection", err => {
 // 1. Go to https://github.com/w3c/web-platform-tests/tree/master/url
 // 2. Press "y" on your keyboard to get a permalink
 // 3. Copy the commit hash
-const commitHash = "0050cfbe145bc9c24981186fa47e714147c1674d";
+const commitHash = "d99193c80fc1d52f5a33bf8e8de7e7363a6bfa20";
 
 // Have to use RawGit as JSDOM.fromURL checks Content-Type header.
 const urlPrefix = `https://rawgit.com/w3c/web-platform-tests/${commitHash}/url/`;
diff --git a/test/web-platform.js b/test/web-platform.js
index c701058..45362e5 100644
--- a/test/web-platform.js
+++ b/test/web-platform.js
@@ -150,6 +150,22 @@ describe("Web platform tests", () => {
     }
   });
 
+  describe("bad base URL", () => {
+    for (const rawExpected of parsingTestCases) {
+      if (typeof rawExpected === "string" || !rawExpected.failure) {
+        continue;
+      }
+
+      const expected = {
+        input: "about:blank",
+        base: rawExpected.input,
+        failure: true
+      };
+
+      test(`<${expected.input}> against <${expected.base}>`, testURL(expected));
+    }
+  });
+
   describe("setters", () => {
     for (const key of Object.keys(setterTestData)) {
       if (key === "comment") {