diff --git a/testing/web-platform/meta/url/a-element-xhtml.xhtml.ini b/testing/web-platform/meta/url/a-element-xhtml.xhtml.ini
index e0bfb79ccfae..6bc77b648afa 100644
--- a/testing/web-platform/meta/url/a-element-xhtml.xhtml.ini
+++ b/testing/web-platform/meta/url/a-element-xhtml.xhtml.ini
@@ -816,6 +816,17 @@
   [Parsing: <file://xn--/p> against <about:blank>]
     expected: FAIL
 
-  [Parsing: <file://a%C2%ADb/p> against <about:blank>]
+  [Parsing: <file:///y:> against <about:blank>]
+    expected:
+      if os == "win": FAIL
+
+  [Parsing: <file:///Y:> against <about:blank>]
+    expected:
+      if os == "win": FAIL
+
+  [Parsing: <\\\\\\.\\Y:> against <about:blank>]
+    expected: FAIL
+
+  [Parsing: <\\\\\\.\\y:> against <about:blank>]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/url/a-element.html.ini b/testing/web-platform/meta/url/a-element.html.ini
index b3d2f1ee3924..940dcf0e7c1d 100644
--- a/testing/web-platform/meta/url/a-element.html.ini
+++ b/testing/web-platform/meta/url/a-element.html.ini
@@ -859,5 +859,16 @@
     expected: FAIL
 
   [Parsing: <file://a%C2%ADb/p> against <about:blank>]
+    expected:
+      if os == "win": FAIL
+
+  [Parsing: <file:///Y:> against <about:blank>]
+    expected:
+      if os == "win": FAIL
+
+  [Parsing: <\\\\\\.\\Y:> against <about:blank>]
+    expected: FAIL
+
+  [Parsing: <\\\\\\.\\y:> against <about:blank>]
     expected: FAIL
 
diff --git a/testing/web-platform/meta/url/failure.html.ini b/testing/web-platform/meta/url/failure.html.ini
index 860a97d1d231..7ecd78b42b91 100644
--- a/testing/web-platform/meta/url/failure.html.ini
+++ b/testing/web-platform/meta/url/failure.html.ini
@@ -1,7 +1,7 @@
 [failure.html]
   expected:
-    if fission and (os == "linux") and not debug: ["OK", "CRASH"]
-    if fission and (os == "win"): ["CRASH", "OK", "ERROR"]
+    if fission and (os == "linux") and not debug: [OK, CRASH]
+    if fission and (os == "win"): [CRASH, OK, ERROR]
   [URL's href: file://example:1/ should throw]
     expected: FAIL
 
@@ -569,3 +569,27 @@
     expected:
       if (os == "linux") and fission: FAIL
 
+  [sendBeacon(): \\\\\\.\\Y: should throw]
+    expected: FAIL
+
+  [sendBeacon(): \\\\\\.\\y: should throw]
+    expected: FAIL
+
+  [window.open(): \\\\\\.\\y: should throw]
+    expected: FAIL
+
+  [window.open(): \\\\\\.\\Y: should throw]
+    expected: FAIL
+
+  [Location's href: \\\\\\.\\Y: should throw]
+    expected: FAIL
+
+  [Location's href: \\\\\\.\\y: should throw]
+    expected: FAIL
+
+  [XHR: \\\\\\.\\y: should throw]
+    expected: FAIL
+
+  [XHR: \\\\\\.\\Y: should throw]
+    expected: FAIL
+
diff --git a/testing/web-platform/meta/url/url-constructor.html.ini b/testing/web-platform/meta/url/url-constructor.html.ini
index 0eea2e9f9c12..22ca7daf0e61 100644
--- a/testing/web-platform/meta/url/url-constructor.html.ini
+++ b/testing/web-platform/meta/url/url-constructor.html.ini
@@ -411,3 +411,11 @@
   [Parsing: <file://a%C2%ADb/p> against <about:blank>]
     expected: FAIL
 
+  [Parsing: <file:///y:> against <about:blank>]
+    expected:
+      if os == "win": FAIL
+
+  [Parsing: <file:///Y:> against <about:blank>]
+    expected:
+      if os == "win": FAIL
+