diff --git a/testing/web-platform/tests/url/resources/a-element-origin.js b/testing/web-platform/tests/url/resources/a-element-origin.js
index 3b8cb1cbbe7c..cb7d4a895c40 100644
--- a/testing/web-platform/tests/url/resources/a-element-origin.js
+++ b/testing/web-platform/tests/url/resources/a-element-origin.js
@@ -16,6 +16,8 @@ function runURLTests(urltests) {
   for(var i = 0, l = urltests.length; i < l; i++) {
     var expected = urltests[i]
     if (typeof expected === "string" || !("origin" in expected)) continue
+    // skip without base because you cannot unset the baseURL of a document
+    if (expected.base === null) continue;
 
     test(function() {
       var url = bURL(expected.input, expected.base)
diff --git a/testing/web-platform/tests/url/resources/a-element.js b/testing/web-platform/tests/url/resources/a-element.js
index f64531bc8bd5..553855a870c5 100644
--- a/testing/web-platform/tests/url/resources/a-element.js
+++ b/testing/web-platform/tests/url/resources/a-element.js
@@ -16,6 +16,8 @@ function runURLTests(urltests) {
   for(var i = 0, l = urltests.length; i < l; i++) {
     var expected = urltests[i]
     if (typeof expected === "string") continue // skip comments
+    // skip without base because you cannot unset the baseURL of a document
+    if (expected.base === null) continue;
 
     test(function() {
       var url = bURL(expected.input, expected.base)
diff --git a/testing/web-platform/tests/url/resources/urltestdata.json b/testing/web-platform/tests/url/resources/urltestdata.json
index a56b30caf98c..e346f87c3db4 100644
--- a/testing/web-platform/tests/url/resources/urltestdata.json
+++ b/testing/web-platform/tests/url/resources/urltestdata.json
@@ -8016,5 +8016,16 @@
     "protocol": "abc:",
     "search": "",
     "username": ""
+  },
+  "Empty query and fragment with blank should throw an error",
+  {
+    "input": "#",
+    "base": null,
+    "failure": true
+  },
+  {
+    "input": "?",
+    "base": null,
+    "failure": true
   }
 ]
diff --git a/testing/web-platform/tests/url/url-constructor.any.js b/testing/web-platform/tests/url/url-constructor.any.js
index 3f4af56d2a96..dfa98092fa64 100644
--- a/testing/web-platform/tests/url/url-constructor.any.js
+++ b/testing/web-platform/tests/url/url-constructor.any.js
@@ -1,7 +1,7 @@
 // META: timeout=long
 
 function bURL(url, base) {
-  return new URL(url, base || "about:blank")
+  return base ? new URL(url, base) : new URL(url)
 }
 
 function runURLTests(urltests) {
diff --git a/testing/web-platform/tests/url/url-origin.any.js b/testing/web-platform/tests/url/url-origin.any.js
index d9ef64c73b8b..9c1f97ed2e59 100644
--- a/testing/web-platform/tests/url/url-origin.any.js
+++ b/testing/web-platform/tests/url/url-origin.any.js
@@ -1,7 +1,7 @@
 promise_test(() => fetch("resources/urltestdata.json").then(res => res.json()).then(runURLTests), "Loading data…");
 
 function bURL(url, base) {
-  return new URL(url, base || "about:blank")
+  return base ? new URL(url, base) : new URL(url)
 }
 
 function runURLTests(urltests) {