diff --git a/src/pat/inject/inject.js b/src/pat/inject/inject.js
index 5dd81a7e6..b35bf4c80 100644
--- a/src/pat/inject/inject.js
+++ b/src/pat/inject/inject.js
@@ -186,14 +186,20 @@ const inject = {
         const $el = $(e.currentTarget);
         let cfgs = $el.data("pat-inject");
         if ($el[0].tagName === "FORM" && e.type === "submit") {
-            if ($el[0].matches(":invalid")) {
-                // Do not submit invalid forms.
-                // Works with native form validation and with pat-validation.
+            const form = $el[0];
+            const submitter = e.submitter;
+
+            // Do not submit invalid forms, if validation is active.
+            // Works with native form validation and with pat-validation.
+            if (
+                !submitter?.matches("[formnovalidate]") &&
+                !form.matches("[novalidate]") &&
+                form.matches(":invalid")
+            ) {
                 log.debug("Form is invalid, aborting");
                 return;
             }
 
-            const submitter = e.submitter;
             const formaction = submitter?.getAttribute("formaction");
             if (formaction) {
                 const opts = {
diff --git a/src/pat/inject/inject.test.js b/src/pat/inject/inject.test.js
index 78debe099..82a04b161 100644
--- a/src/pat/inject/inject.test.js
+++ b/src/pat/inject/inject.test.js
@@ -1439,6 +1439,128 @@ describe("pat-inject", function () {
                         expect(pattern.onTrigger).toHaveBeenCalledTimes(1);
                     });
                 });
+
+                describe("9.2.4.6 - Validation on submit", () => {
+                    it("9.2.4.6.1 - Submit valid forms.", async function () {
+                        document.body.innerHTML = `
+                          <form action="." class="pat-inject">
+                            <input name="ok" />
+                            <button>submit</button>
+                          </form>
+                        `;
+                        jest.spyOn(pattern, "execute");
+
+                        const form = document.querySelector("form");
+                        const button = form.querySelector("button");
+
+                        // add submit listener
+                        let catched = false;
+                        form.addEventListener("submit", () => {
+                            catched = true;
+                        });
+
+                        pattern.init($(form));
+                        await utils.timeout(1); // wait a tick for async to settle.
+
+                        button.click();
+
+                        expect(catched).toBe(true);
+                        expect(pattern.execute).toHaveBeenCalled();
+                    });
+
+                    it("9.2.4.6.2 - Do not submit invalid forms.", async function () {
+                        document.body.innerHTML = `
+                          <form action="." class="pat-inject">
+                            <input name="ok" required />
+                            <button>submit</button>
+                          </form>
+                        `;
+                        jest.spyOn(pattern, "execute");
+
+                        const form = document.querySelector("form");
+                        const button = form.querySelector("button");
+
+                        // add submit listener
+                        let catched = false;
+                        form.addEventListener("submit", () => {
+                            catched = true;
+                        });
+
+                        pattern.init($(form));
+                        await utils.timeout(1); // wait a tick for async to settle.
+
+                        button.click();
+
+                        expect(catched).toBe(false);
+                        expect(pattern.execute).not.toHaveBeenCalled();
+                    });
+
+                    it("9.2.4.6.3 - Respect a form novalidate attribute and allow submission.", async function () {
+                        document.body.innerHTML = `
+                          <form novalidate action="." class="pat-inject">
+                            <input name="ok" required />
+                            <button>submit</button>
+                          </form>
+                        `;
+                        jest.spyOn(pattern, "execute");
+
+                        const form = document.querySelector("form");
+                        const button = form.querySelector("button");
+
+                        // add submit listener
+                        let catched = false;
+                        form.addEventListener("submit", () => {
+                            catched = true;
+                        });
+
+                        pattern.init($(form));
+                        await utils.timeout(1); // wait a tick for async to settle.
+
+                        button.click();
+
+                        expect(catched).toBe(true);
+                        expect(pattern.execute).toHaveBeenCalled();
+                    });
+
+                    // The following test does not work with jsDOM 25.0.1.
+                    // jsDOM supports `form[novalidate]` but not `button[formnovalidate]`
+                    // Ref: https://github.com/jsdom/jsdom/pull/3249
+                    it.skip("9.2.4.6.4 - Respect a formnovalidate attribute on buttons and allow submission.", async function () {
+                        document.body.innerHTML = `
+                          <form action="." class="pat-inject">
+                            <input name="ok" required />
+                            <button class="cancel" formnovalidate>cancel</button>
+                            <button class="submit">submit</button>
+                          </form>
+                        `;
+                        jest.spyOn(pattern, "execute");
+
+                        const form = document.querySelector("form");
+                        const button_cancel = form.querySelector("button.cancel");
+                        const button_submit = form.querySelector("button.submit");
+
+                        // add submit listener
+                        let catched = false;
+                        form.addEventListener("submit", () => {
+                            catched = true;
+                        });
+
+                        pattern.init($(form));
+                        await utils.timeout(1); // wait a tick for async to settle.
+
+                        button_submit.click();
+
+                        expect(catched).toBe(false);
+                        expect(pattern.execute).not.toHaveBeenCalled();
+
+                        button_cancel.click();
+
+                        expect(catched).toBe(true);
+                        expect(pattern.execute).toHaveBeenCalled();
+
+                    });
+
+                });
             });
         });
     });