diff --git a/api/HTMLButtonElement.json b/api/HTMLButtonElement.json
index bbf6fd883a2ed5..925614527a12cf 100644
--- a/api/HTMLButtonElement.json
+++ b/api/HTMLButtonElement.json
@@ -297,6 +297,7 @@
       },
       "formAction": {
         "__compat": {
+          "mdn_url": "https://developer.mozilla.org/docs/Web/API/HTMLButtonElement/formAction",
           "spec_url": "https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#dom-fs-formaction",
           "tags": [
             "web-features:button"
diff --git a/api/HTMLInputElement.json b/api/HTMLInputElement.json
index 0bb217a084f7a1..09d820e934c974 100644
--- a/api/HTMLInputElement.json
+++ b/api/HTMLInputElement.json
@@ -630,6 +630,7 @@
       },
       "formAction": {
         "__compat": {
+          "mdn_url": "https://developer.mozilla.org/docs/Web/API/HTMLInputElement/formAction",
           "spec_url": "https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#dom-fs-formaction",
           "support": {
             "chrome": {
diff --git a/api/Request.json b/api/Request.json
index ed5817ef272be0..bc8f8f736e68f6 100644
--- a/api/Request.json
+++ b/api/Request.json
@@ -1084,6 +1084,7 @@
       },
       "keepalive": {
         "__compat": {
+          "mdn_url": "https://developer.mozilla.org/docs/Web/API/Request/keepalive",
           "spec_url": "https://fetch.spec.whatwg.org/#ref-for-dom-request-keepalive②",
           "support": {
             "chrome": {