diff --git a/tests/spec/core/dfn-spec.js b/tests/spec/core/dfn-spec.js
index 2877489052..9433144a99 100644
--- a/tests/spec/core/dfn-spec.js
+++ b/tests/spec/core/dfn-spec.js
@@ -418,14 +418,12 @@ describe("Core — Definitions", () => {
       expect(dfn.dataset.export).toBe("");
     });
 
-    // TODO: failing for Chrome, but not Firefox. Needs investigation.
-    // eslint-disable-next-line jasmine/no-disabled-tests
-    xit("handles bad attributes", async () => {
+    it("handles bad attributes", async () => {
       const body = html`
         <section>
           <h2>Attributes</h2>
           <p id="attribute-bad">
-            <dfn class="element-attr">-attribute</dfn>
+            <dfn class="element-attr">bad attribute</dfn>
           </p>
         </section>
       `;
@@ -434,7 +432,7 @@ describe("Core — Definitions", () => {
 
       const errors = findDfnErrors(doc);
       expect(errors).toHaveSize(1);
-      expect(errors[0].message).toContain("-attribute");
+      expect(errors[0].message).toContain("bad attribute");
     });
 
     it("handles attribute values", async () => {
diff --git a/tests/spec/core/validators-spec.js b/tests/spec/core/validators-spec.js
index 04db28fdf6..7f813756ad 100644
--- a/tests/spec/core/validators-spec.js
+++ b/tests/spec/core/validators-spec.js
@@ -14,6 +14,7 @@ describe("Core - Validators", () => {
         "feGaussianBlur",
         "body",
         "html",
+        "🪳",
       ];
       for (const element of elements) {
         const dfn = document.createElement("dfn");
@@ -27,10 +28,8 @@ describe("Core - Validators", () => {
       }
     });
 
-    // TODO: failing for Chrome, but not Firefox. Needs investigation.
-    // eslint-disable-next-line jasmine/no-disabled-tests
-    xit("generates an error if the element name is not valid", () => {
-      const elements = ["my element", "crypto$", "🪳", "-something", ""];
+    it("generates an error if the element name is not valid", () => {
+      const elements = ["my element", ""];
       for (const element of elements) {
         const dfn = document.createElement("dfn");
         const context = `element name: ${element}`;
@@ -44,7 +43,12 @@ describe("Core - Validators", () => {
     });
 
     it("doesn't generates an error if the attribute name is valid", () => {
-      const attributes = ["crossorigin", "aria-hidden", "aria-roledescription"];
+      const attributes = [
+        "crossorigin",
+        "aria-hidden",
+        "aria-roledescription",
+        "aria-😇",
+      ];
       for (const attribute of attributes) {
         const context = `attribute name: ${attribute}`;
         const dfn = document.createElement("dfn");
@@ -57,10 +61,8 @@ describe("Core - Validators", () => {
       }
     });
 
-    // TODO: failing for Chrome, but not Firefox. Needs investigation.
-    // eslint-disable-next-line jasmine/no-disabled-tests
-    xit("generates an error if the attribute name is invalid", () => {
-      const attributes = ["-crossorigin", "-whatever-", "aria-😇"];
+    it("generates an error if the attribute name is invalid", () => {
+      const attributes = ["my attribute", ""];
       for (const attribute of attributes) {
         const context = `attribute name: ${attribute}`;
         const dfn = document.createElement("dfn");