diff --git a/lib/fetch/body.js b/lib/fetch/body.js
index 0f45e8570dd..29e8d09e324 100644
--- a/lib/fetch/body.js
+++ b/lib/fetch/body.js
@@ -14,7 +14,7 @@ const { isErrored } = require('../core/util')
 const { isUint8Array, isArrayBuffer } = require('util/types')
 const { File } = require('./file')
 const { StringDecoder } = require('string_decoder')
-const { parseMIMEType } = require('./dataURL')
+const { parseMIMEType, serializeAMimeType } = require('./dataURL')
 
 /** @type {globalThis['ReadableStream']} */
 let ReadableStream
@@ -516,9 +516,15 @@ function packageData ({ bytes, size }, type, mimeType) {
       return uint8.buffer
     }
     case 'Blob': {
+      if (mimeType === 'failure') {
+        mimeType = ''
+      } else if (mimeType) {
+        mimeType = serializeAMimeType(mimeType)
+      }
+
       // Return a Blob whose contents are bytes and type attribute
       // is mimeType.
-      return new Blob(bytes, { type: mimeType?.essence })
+      return new Blob(bytes, { type: mimeType })
     }
     case 'JSON': {
       // Return the result of running parse JSON from bytes on bytes.
diff --git a/lib/fetch/dataURL.js b/lib/fetch/dataURL.js
index a1c81a54a1d..db6357e4762 100644
--- a/lib/fetch/dataURL.js
+++ b/lib/fetch/dataURL.js
@@ -305,7 +305,7 @@ function parseMIMEType (input) {
   )
 
   // 8. Remove any trailing HTTP whitespace from subtype.
-  subtype = subtype.trim()
+  subtype = subtype.trimEnd()
 
   // 9. If subtype is the empty string or does not solely
   // contain HTTP token code points, then return failure.
diff --git a/package.json b/package.json
index 8490063ab09..4bc60cd94d1 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
     "test:tap": "tap test/*.js test/diagnostics-channel/*.js",
     "test:tdd": "tap test/*.js test/diagnostics-channel/*.js -w",
     "test:typescript": "tsd",
-    "test:wpt": "node scripts/verifyVersion 18 || (node test/wpt/start-fetch.mjs && node test/wpt/start-FileAPI.mjs)",
+    "test:wpt": "node scripts/verifyVersion 18 || (node test/wpt/start-fetch.mjs && node test/wpt/start-FileAPI.mjs && node test/wpt/start-mimesniff.mjs)",
     "coverage": "nyc --reporter=text --reporter=html npm run test",
     "coverage:ci": "nyc --reporter=lcov npm run test",
     "bench": "PORT=3042 concurrently -k -s first npm:bench:server npm:bench:run",
diff --git a/test/wpt/runner/runner/runner.mjs b/test/wpt/runner/runner/runner.mjs
index f9a37c24cb7..c2d8b1ada5e 100644
--- a/test/wpt/runner/runner/runner.mjs
+++ b/test/wpt/runner/runner/runner.mjs
@@ -120,7 +120,7 @@ export class WPTRunner extends EventEmitter {
    * Called after a test has succeeded or failed.
    */
   handleIndividualTestCompletion (message, fileName) {
-    const { fail } = this.#status[fileName] ?? {}
+    const { fail, allowUnexpectedFailures } = this.#status[fileName] ?? {}
 
     if (message.type === 'result') {
       this.#stats.completed += 1
@@ -128,7 +128,7 @@ export class WPTRunner extends EventEmitter {
       if (message.result.status === 1) {
         this.#stats.failed += 1
 
-        if (fail && fail.includes(message.result.name)) {
+        if (allowUnexpectedFailures || (fail && fail.includes(message.result.name))) {
           this.#stats.expectedFailures += 1
         } else {
           process.exitCode = 1
diff --git a/test/wpt/server/server.mjs b/test/wpt/server/server.mjs
index a5c3766e23b..7e5b75bdf52 100644
--- a/test/wpt/server/server.mjs
+++ b/test/wpt/server/server.mjs
@@ -30,6 +30,8 @@ const server = createServer(async (req, res) => {
   const fullUrl = new URL(req.url, `http://localhost:${server.address().port}`)
 
   switch (fullUrl.pathname) {
+    case '/mimesniff/mime-types/resources/generated-mime-types.json':
+    case '/mimesniff/mime-types/resources/mime-types.json':
     case '/interfaces/dom.idl':
     case '/interfaces/html.idl':
     case '/interfaces/fetch.idl':
diff --git a/test/wpt/start-mimesniff.mjs b/test/wpt/start-mimesniff.mjs
new file mode 100644
index 00000000000..90e6bdd6c04
--- /dev/null
+++ b/test/wpt/start-mimesniff.mjs
@@ -0,0 +1,24 @@
+import { WPTRunner } from './runner/runner/runner.mjs'
+import { join } from 'path'
+import { fileURLToPath } from 'url'
+import { fork } from 'child_process'
+import { on } from 'events'
+
+const serverPath = fileURLToPath(join(import.meta.url, '../server/server.mjs'))
+
+const child = fork(serverPath, [], {
+  stdio: ['pipe', 'pipe', 'pipe', 'ipc']
+})
+
+for await (const [message] of on(child, 'message')) {
+  if (message.server) {
+    const runner = new WPTRunner('mimesniff', message.server)
+    runner.run()
+
+    runner.once('completion', () => {
+      child.send('shutdown')
+    })
+  } else if (message.message === 'shutdown') {
+    process.exit()
+  }
+}
diff --git a/test/wpt/status/mimesniff.status.json b/test/wpt/status/mimesniff.status.json
new file mode 100644
index 00000000000..d1b1c33e8af
--- /dev/null
+++ b/test/wpt/status/mimesniff.status.json
@@ -0,0 +1,5 @@
+{
+	"parsing.any.js": {
+		"allowUnexpectedFailures": true
+	}
+}
\ No newline at end of file
diff --git a/test/wpt/tests/mimesniff/mime-types/parsing.any.js b/test/wpt/tests/mimesniff/mime-types/parsing.any.js
new file mode 100644
index 00000000000..93be6bfb139
--- /dev/null
+++ b/test/wpt/tests/mimesniff/mime-types/parsing.any.js
@@ -0,0 +1,57 @@
+// META: timeout=long
+
+promise_test(() => {
+  return Promise.all([
+    fetch("resources/mime-types.json"),
+    fetch("resources/generated-mime-types.json")
+  ]).then(([res, res2]) => res.json().then(runTests).then(() => res2.json().then(runTests)));
+}, "Loading data…");
+
+function isByteCompatible(str) {
+  // see https://fetch.spec.whatwg.org/#concept-header-value-normalize
+  if(/^[\u0009\u0020\u000A\u000D]+|[\u0009\u0020\u000A\u000D]+$/.test(str)) {
+    return "header-value-incompatible";
+  }
+
+  for(let i = 0; i < str.length; i++) {
+    const charCode = str.charCodeAt(i);
+    // See https://fetch.spec.whatwg.org/#concept-header-value
+    if(charCode > 0xFF) {
+      return "incompatible";
+    } else if(charCode === 0x00 || charCode === 0x0A || charCode === 0x0D) {
+      return "header-value-error";
+    }
+  }
+  return "compatible";
+}
+
+function runTests(tests) {
+  tests.forEach(val => {
+    if(typeof val === "string") {
+      return;
+    }
+    const output = val.output === null ? "" : val.output
+    test(() => {
+      assert_equals(new Blob([], { type: val.input}).type, output, "Blob");
+      assert_equals(new File([], "noname", { type: val.input}).type, output, "File");
+    }, val.input + " (Blob/File)");
+
+    const compatibleNess = isByteCompatible(val.input);
+    if(compatibleNess === "header-value-incompatible") {
+      return;
+    }
+
+    promise_test(() => {
+      if(compatibleNess === "incompatible" || compatibleNess === "header-value-error") {
+        assert_throws_js(TypeError, () => new Request("about:blank", { headers: [["Content-Type", val.input]] }));
+        assert_throws_js(TypeError, () => new Response(null, { headers: [["Content-Type", val.input]] }));
+        return Promise.resolve();
+      } else {
+        return Promise.all([
+          new Request("about:blank", { headers: [["Content-Type", val.input]] }).blob().then(blob => assert_equals(blob.type, output)),
+          new Response(null, { headers: [["Content-Type", val.input]] }).blob().then(blob => assert_equals(blob.type, output))
+        ]);
+      }
+    }, val.input + " (Request/Response)");
+  });
+}
diff --git a/test/wpt/tests/mimesniff/mime-types/resources/generated-mime-types.json b/test/wpt/tests/mimesniff/mime-types/resources/generated-mime-types.json
new file mode 100644
index 00000000000..f8934da46a0
--- /dev/null
+++ b/test/wpt/tests/mimesniff/mime-types/resources/generated-mime-types.json
@@ -0,0 +1,3526 @@
+[
+  {
+    "input": "\u0000/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0000",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0000=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0000;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0000\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0001/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0001",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0001=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0001;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0001\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0002/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0002",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0002=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0002;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0002\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0003/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0003",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0003=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0003;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0003\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0004/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0004",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0004=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0004;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0004\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0005/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0005",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0005=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0005;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0005\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0006/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0006",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0006=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0006;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0006\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0007/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0007",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0007=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0007;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0007\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\b/x",
+    "output": null
+  },
+  {
+    "input": "x/\b",
+    "output": null
+  },
+  {
+    "input": "x/x;\b=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\b;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\b\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\t/x",
+    "output": null
+  },
+  {
+    "input": "x/\t",
+    "output": null
+  },
+  {
+    "input": "x/x;\t=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\n/x",
+    "output": null
+  },
+  {
+    "input": "x/\n",
+    "output": null
+  },
+  {
+    "input": "x/x;\n=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\n;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\n\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u000b/x",
+    "output": null
+  },
+  {
+    "input": "x/\u000b",
+    "output": null
+  },
+  {
+    "input": "x/x;\u000b=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u000b;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u000b\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\f/x",
+    "output": null
+  },
+  {
+    "input": "x/\f",
+    "output": null
+  },
+  {
+    "input": "x/x;\f=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\f;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\f\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\r/x",
+    "output": null
+  },
+  {
+    "input": "x/\r",
+    "output": null
+  },
+  {
+    "input": "x/x;\r=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\r;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\r\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u000e/x",
+    "output": null
+  },
+  {
+    "input": "x/\u000e",
+    "output": null
+  },
+  {
+    "input": "x/x;\u000e=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u000e;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u000e\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u000f/x",
+    "output": null
+  },
+  {
+    "input": "x/\u000f",
+    "output": null
+  },
+  {
+    "input": "x/x;\u000f=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u000f;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u000f\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0010/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0010",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0010=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0010;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0010\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0011/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0011",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0011=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0011;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0011\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0012/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0012",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0012=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0012;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0012\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0013/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0013",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0013=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0013;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0013\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0014/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0014",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0014=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0014;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0014\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0015/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0015",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0015=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0015;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0015\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0016/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0016",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0016=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0016;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0016\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0017/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0017",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0017=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0017;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0017\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "\u0018/x",
+    "output": null
+  },
+  {
+    "input": "x/\u0018",
+    "output": null
+  },
+  {
+    "input": "x/x;\u0018=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u0018;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u0018\";bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
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+  {
+    "input": "x/x;x=\"\u00f5\";bonus=x",
+    "output": "x/x;x=\"\u00f5\";bonus=x"
+  },
+  {
+    "input": "\u00f6/x",
+    "output": null
+  },
+  {
+    "input": "x/\u00f6",
+    "output": null
+  },
+  {
+    "input": "x/x;\u00f6=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u00f6;bonus=x",
+    "output": "x/x;x=\"\u00f6\";bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u00f6\";bonus=x",
+    "output": "x/x;x=\"\u00f6\";bonus=x"
+  },
+  {
+    "input": "\u00f7/x",
+    "output": null
+  },
+  {
+    "input": "x/\u00f7",
+    "output": null
+  },
+  {
+    "input": "x/x;\u00f7=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u00f7;bonus=x",
+    "output": "x/x;x=\"\u00f7\";bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u00f7\";bonus=x",
+    "output": "x/x;x=\"\u00f7\";bonus=x"
+  },
+  {
+    "input": "\u00f8/x",
+    "output": null
+  },
+  {
+    "input": "x/\u00f8",
+    "output": null
+  },
+  {
+    "input": "x/x;\u00f8=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u00f8;bonus=x",
+    "output": "x/x;x=\"\u00f8\";bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u00f8\";bonus=x",
+    "output": "x/x;x=\"\u00f8\";bonus=x"
+  },
+  {
+    "input": "\u00f9/x",
+    "output": null
+  },
+  {
+    "input": "x/\u00f9",
+    "output": null
+  },
+  {
+    "input": "x/x;\u00f9=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u00f9;bonus=x",
+    "output": "x/x;x=\"\u00f9\";bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u00f9\";bonus=x",
+    "output": "x/x;x=\"\u00f9\";bonus=x"
+  },
+  {
+    "input": "\u00fa/x",
+    "output": null
+  },
+  {
+    "input": "x/\u00fa",
+    "output": null
+  },
+  {
+    "input": "x/x;\u00fa=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u00fa;bonus=x",
+    "output": "x/x;x=\"\u00fa\";bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u00fa\";bonus=x",
+    "output": "x/x;x=\"\u00fa\";bonus=x"
+  },
+  {
+    "input": "\u00fb/x",
+    "output": null
+  },
+  {
+    "input": "x/\u00fb",
+    "output": null
+  },
+  {
+    "input": "x/x;\u00fb=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u00fb;bonus=x",
+    "output": "x/x;x=\"\u00fb\";bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u00fb\";bonus=x",
+    "output": "x/x;x=\"\u00fb\";bonus=x"
+  },
+  {
+    "input": "\u00fc/x",
+    "output": null
+  },
+  {
+    "input": "x/\u00fc",
+    "output": null
+  },
+  {
+    "input": "x/x;\u00fc=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u00fc;bonus=x",
+    "output": "x/x;x=\"\u00fc\";bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u00fc\";bonus=x",
+    "output": "x/x;x=\"\u00fc\";bonus=x"
+  },
+  {
+    "input": "\u00fd/x",
+    "output": null
+  },
+  {
+    "input": "x/\u00fd",
+    "output": null
+  },
+  {
+    "input": "x/x;\u00fd=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u00fd;bonus=x",
+    "output": "x/x;x=\"\u00fd\";bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u00fd\";bonus=x",
+    "output": "x/x;x=\"\u00fd\";bonus=x"
+  },
+  {
+    "input": "\u00fe/x",
+    "output": null
+  },
+  {
+    "input": "x/\u00fe",
+    "output": null
+  },
+  {
+    "input": "x/x;\u00fe=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u00fe;bonus=x",
+    "output": "x/x;x=\"\u00fe\";bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u00fe\";bonus=x",
+    "output": "x/x;x=\"\u00fe\";bonus=x"
+  },
+  {
+    "input": "\u00ff/x",
+    "output": null
+  },
+  {
+    "input": "x/\u00ff",
+    "output": null
+  },
+  {
+    "input": "x/x;\u00ff=x;bonus=x",
+    "output": "x/x;bonus=x"
+  },
+  {
+    "input": "x/x;x=\u00ff;bonus=x",
+    "output": "x/x;x=\"\u00ff\";bonus=x"
+  },
+  {
+    "input": "x/x;x=\"\u00ff\";bonus=x",
+    "output": "x/x;x=\"\u00ff\";bonus=x"
+  }
+]
diff --git a/test/wpt/tests/mimesniff/mime-types/resources/mime-types.json b/test/wpt/tests/mimesniff/mime-types/resources/mime-types.json
new file mode 100644
index 00000000000..1d0ec64a544
--- /dev/null
+++ b/test/wpt/tests/mimesniff/mime-types/resources/mime-types.json
@@ -0,0 +1,397 @@
+[
+  "Basics",
+  {
+    "input": "text/html;charset=gbk",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "TEXT/HTML;CHARSET=GBK",
+    "output": "text/html;charset=GBK",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  "Legacy comment syntax",
+  {
+    "input": "text/html;charset=gbk(",
+    "output": "text/html;charset=\"gbk(\"",
+    "navigable": true,
+    "encoding": null
+  },
+  {
+    "input": "text/html;x=(;charset=gbk",
+    "output": "text/html;x=\"(\";charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  "Duplicate parameter",
+  {
+    "input": "text/html;charset=gbk;charset=windows-1255",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;charset=();charset=GBK",
+    "output": "text/html;charset=\"()\"",
+    "navigable": true,
+    "encoding": null
+  },
+  "Spaces",
+  {
+    "input": "text/html;charset =gbk",
+    "output": "text/html",
+    "navigable": true,
+    "encoding": null
+  },
+  {
+    "input": "text/html ;charset=gbk",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html; charset=gbk",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;charset= gbk",
+    "output": "text/html;charset=\" gbk\"",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;charset= \"gbk\"",
+    "output": "text/html;charset=\" \\\"gbk\\\"\"",
+    "navigable": true,
+    "encoding": null
+  },
+  "0x0B and 0x0C",
+  {
+    "input": "text/html;charset=\u000Bgbk",
+    "output": "text/html",
+    "navigable": true,
+    "encoding": null
+  },
+  {
+    "input": "text/html;charset=\u000Cgbk",
+    "output": "text/html",
+    "navigable": true,
+    "encoding": null
+  },
+  {
+    "input": "text/html;\u000Bcharset=gbk",
+    "output": "text/html",
+    "navigable": true,
+    "encoding": null
+  },
+  {
+    "input": "text/html;\u000Ccharset=gbk",
+    "output": "text/html",
+    "navigable": true,
+    "encoding": null
+  },
+  "Single quotes are a token, not a delimiter",
+  {
+    "input": "text/html;charset='gbk'",
+    "output": "text/html;charset='gbk'",
+    "navigable": true,
+    "encoding": null
+  },
+  {
+    "input": "text/html;charset='gbk",
+    "output": "text/html;charset='gbk",
+    "navigable": true,
+    "encoding": null
+  },
+  {
+    "input": "text/html;charset=gbk'",
+    "output": "text/html;charset=gbk'",
+    "navigable": true,
+    "encoding": null
+  },
+  {
+    "input": "text/html;charset=';charset=GBK",
+    "output": "text/html;charset='",
+    "navigable": true,
+    "encoding": null
+  },
+  "Invalid parameters",
+  {
+    "input": "text/html;test;charset=gbk",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;test=;charset=gbk",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;';charset=gbk",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;\";charset=gbk",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html ; ; charset=gbk",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;;;;charset=gbk",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;charset= \"\u007F;charset=GBK",
+    "output": "text/html;charset=GBK",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;charset=\"\u007F;charset=foo\";charset=GBK",
+    "output": "text/html;charset=GBK",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  "Double quotes",
+  {
+    "input": "text/html;charset=\"gbk\"",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;charset=\"gbk",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;charset=gbk\"",
+    "output": "text/html;charset=\"gbk\\\"\"",
+    "navigable": true,
+    "encoding": null
+  },
+  {
+    "input": "text/html;charset=\" gbk\"",
+    "output": "text/html;charset=\" gbk\"",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;charset=\"gbk \"",
+    "output": "text/html;charset=\"gbk \"",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;charset=\"\\ gbk\"",
+    "output": "text/html;charset=\" gbk\"",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;charset=\"\\g\\b\\k\"",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;charset=\"gbk\"x",
+    "output": "text/html;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  {
+    "input": "text/html;charset=\"\";charset=GBK",
+    "output": "text/html;charset=\"\"",
+    "navigable": true,
+    "encoding": null
+  },
+  {
+    "input": "text/html;charset=\";charset=GBK",
+    "output": "text/html;charset=\";charset=GBK\"",
+    "navigable": true,
+    "encoding": null
+  },
+  "Unexpected code points",
+  {
+    "input": "text/html;charset={gbk}",
+    "output": "text/html;charset=\"{gbk}\"",
+    "navigable": true,
+    "encoding": null
+  },
+  "Parameter name longer than 127",
+  {
+    "input": "text/html;0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789=x;charset=gbk",
+    "output": "text/html;0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789=x;charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  "type/subtype longer than 127",
+  {
+    "input": "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789/0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789",
+    "output": "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789/0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789"
+  },
+  "Invalid names",
+  {
+    "input": "text/html;a]=bar;b[=bar;c=bar",
+    "output": "text/html;c=bar"
+  },
+  "Semicolons in value",
+  {
+    "input": "text/html;valid=\";\";foo=bar",
+    "output": "text/html;valid=\";\";foo=bar"
+  },
+  {
+    "input": "text/html;in]valid=\";asd=foo\";foo=bar",
+    "output": "text/html;foo=bar"
+  },
+  "Valid",
+  {
+    "input": "!#$%&'*+-.^_`|~0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz/!#$%&'*+-.^_`|~0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz;!#$%&'*+-.^_`|~0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz=!#$%&'*+-.^_`|~0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz",
+    "output": "!#$%&'*+-.^_`|~0123456789abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz/!#$%&'*+-.^_`|~0123456789abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz;!#$%&'*+-.^_`|~0123456789abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz=!#$%&'*+-.^_`|~0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+  },
+  {
+    "input": "x/x;x=\"\t !\\\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\u0080\u0081\u0082\u0083\u0084\u0085\u0086\u0087\u0088\u0089\u008A\u008B\u008C\u008D\u008E\u008F\u0090\u0091\u0092\u0093\u0094\u0095\u0096\u0097\u0098\u0099\u009A\u009B\u009C\u009D\u009E\u009F\u00A0\u00A1\u00A2\u00A3\u00A4\u00A5\u00A6\u00A7\u00A8\u00A9\u00AA\u00AB\u00AC\u00AD\u00AE\u00AF\u00B0\u00B1\u00B2\u00B3\u00B4\u00B5\u00B6\u00B7\u00B8\u00B9\u00BA\u00BB\u00BC\u00BD\u00BE\u00BF\u00C0\u00C1\u00C2\u00C3\u00C4\u00C5\u00C6\u00C7\u00C8\u00C9\u00CA\u00CB\u00CC\u00CD\u00CE\u00CF\u00D0\u00D1\u00D2\u00D3\u00D4\u00D5\u00D6\u00D7\u00D8\u00D9\u00DA\u00DB\u00DC\u00DD\u00DE\u00DF\u00E0\u00E1\u00E2\u00E3\u00E4\u00E5\u00E6\u00E7\u00E8\u00E9\u00EA\u00EB\u00EC\u00ED\u00EE\u00EF\u00F0\u00F1\u00F2\u00F3\u00F4\u00F5\u00F6\u00F7\u00F8\u00F9\u00FA\u00FB\u00FC\u00FD\u00FE\u00FF\"",
+    "output": "x/x;x=\"\t !\\\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\u0080\u0081\u0082\u0083\u0084\u0085\u0086\u0087\u0088\u0089\u008A\u008B\u008C\u008D\u008E\u008F\u0090\u0091\u0092\u0093\u0094\u0095\u0096\u0097\u0098\u0099\u009A\u009B\u009C\u009D\u009E\u009F\u00A0\u00A1\u00A2\u00A3\u00A4\u00A5\u00A6\u00A7\u00A8\u00A9\u00AA\u00AB\u00AC\u00AD\u00AE\u00AF\u00B0\u00B1\u00B2\u00B3\u00B4\u00B5\u00B6\u00B7\u00B8\u00B9\u00BA\u00BB\u00BC\u00BD\u00BE\u00BF\u00C0\u00C1\u00C2\u00C3\u00C4\u00C5\u00C6\u00C7\u00C8\u00C9\u00CA\u00CB\u00CC\u00CD\u00CE\u00CF\u00D0\u00D1\u00D2\u00D3\u00D4\u00D5\u00D6\u00D7\u00D8\u00D9\u00DA\u00DB\u00DC\u00DD\u00DE\u00DF\u00E0\u00E1\u00E2\u00E3\u00E4\u00E5\u00E6\u00E7\u00E8\u00E9\u00EA\u00EB\u00EC\u00ED\u00EE\u00EF\u00F0\u00F1\u00F2\u00F3\u00F4\u00F5\u00F6\u00F7\u00F8\u00F9\u00FA\u00FB\u00FC\u00FD\u00FE\u00FF\""
+  },
+  "End-of-file handling",
+  {
+    "input": "x/x;test",
+    "output": "x/x"
+  },
+  {
+    "input": "x/x;test=\"\\",
+    "output": "x/x;test=\"\\\\\""
+  },
+  "Whitespace (not handled by generated-mime-types.json or above)",
+  {
+    "input": "x/x;x= ",
+    "output": "x/x"
+  },
+  {
+    "input": "x/x;x=\t",
+    "output": "x/x"
+  },
+  {
+    "input": "x/x\n\r\t ;x=x",
+    "output": "x/x;x=x"
+  },
+  {
+    "input": "\n\r\t x/x;x=x\n\r\t ",
+    "output": "x/x;x=x"
+  },
+  {
+    "input": "x/x;\n\r\t x=x\n\r\t ;x=y",
+    "output": "x/x;x=x"
+  },
+  "Latin1",
+  {
+    "input": "text/html;test=\u00FF;charset=gbk",
+    "output": "text/html;test=\"\u00FF\";charset=gbk",
+    "navigable": true,
+    "encoding": "GBK"
+  },
+  ">Latin1",
+  {
+    "input": "x/x;test=\uFFFD;x=x",
+    "output": "x/x;x=x"
+  },
+  "Failure",
+  {
+    "input": "\u000Bx/x",
+    "output": null
+  },
+  {
+    "input": "\u000Cx/x",
+    "output": null
+  },
+  {
+    "input": "x/x\u000B",
+    "output": null
+  },
+  {
+    "input": "x/x\u000C",
+    "output": null
+  },
+  {
+    "input": "",
+    "output": null
+  },
+  {
+    "input": "\t",
+    "output": null
+  },
+  {
+    "input": "/",
+    "output": null
+  },
+  {
+    "input": "bogus",
+    "output": null
+  },
+  {
+    "input": "bogus/",
+    "output": null
+  },
+  {
+    "input": "bogus/ ",
+    "output": null
+  },
+  {
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