diff --git a/testing/web-platform/tests/url/resources/toascii.json b/testing/web-platform/tests/url/resources/toascii.json
index 814f06e794866..1fb57673816e4 100644
--- a/testing/web-platform/tests/url/resources/toascii.json
+++ b/testing/web-platform/tests/url/resources/toascii.json
@@ -145,5 +145,27 @@
   {
     "input": "01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.0123456789012345678901234567890123456789012345678.β",
     "output": "01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.0123456789012345678901234567890123456789012345678.xn--nxa"
+  },
+  {
+    "comment": "IDNA ignored code points",
+    "input": "a\u00ADb",
+    "output": "ab"
+  },
+  {
+    "input": "a%C2%ADb",
+    "output": "ab"
+  },
+  {
+    "comment": "Empty host after domain to ASCII",
+    "input": "\u00AD",
+    "output": null
+  },
+  {
+    "input": "%C2%AD",
+    "output": null
+  },
+  {
+    "input": "xn--",
+    "output": null
   }
 ]
diff --git a/testing/web-platform/tests/url/resources/urltestdata.json b/testing/web-platform/tests/url/resources/urltestdata.json
index 4ffbd3cde754f..b5b200e640c90 100644
--- a/testing/web-platform/tests/url/resources/urltestdata.json
+++ b/testing/web-platform/tests/url/resources/urltestdata.json
@@ -6755,5 +6755,50 @@
     "pathname": "foo/bar",
     "search": "",
     "hash": ""
+  },
+  "IDNA ignored code points in file URLs hosts",
+  {
+    "input": "file://a\u00ADb/p",
+    "base": "about:blank",
+    "href": "file://ab/p",
+    "protocol": "file:",
+    "username": "",
+    "password": "",
+    "host": "ab",
+    "hostname": "ab",
+    "port": "",
+    "pathname": "/p",
+    "search": "",
+    "hash": ""
+  },
+  {
+    "input": "file://a%C2%ADb/p",
+    "base": "about:blank",
+    "href": "file://ab/p",
+    "protocol": "file:",
+    "username": "",
+    "password": "",
+    "host": "ab",
+    "hostname": "ab",
+    "port": "",
+    "pathname": "/p",
+    "search": "",
+    "hash": ""
+  },
+  "Empty host after the domain to ASCII",
+  {
+    "input": "file://\u00ad/p",
+    "base": "about:blank",
+    "failure": true
+  },
+  {
+    "input": "file://%C2%AD/p",
+    "base": "about:blank",
+    "failure": true
+  },
+  {
+    "input": "file://xn--/p",
+    "base": "about:blank",
+    "failure": true
   }
 ]