diff --git a/api/RTCStatsReport.json b/api/RTCStatsReport.json
index cce102371fb73a..ac1ab0a83a1160 100644
--- a/api/RTCStatsReport.json
+++ b/api/RTCStatsReport.json
@@ -2304,6 +2304,7 @@
         "audioLevel": {
           "__compat": {
             "description": "`audioLevel` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/audioLevel",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-audiolevel",
             "tags": [
               "web-features:webrtc-stats"
@@ -2417,6 +2418,7 @@
         "concealedSamples": {
           "__compat": {
             "description": "`concealedSamples` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/concealedSamples",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-concealedsamples",
             "tags": [
               "web-features:webrtc-stats"
@@ -2452,6 +2454,7 @@
         "concealmentEvents": {
           "__compat": {
             "description": "`concealmentEvents` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/concealmentEvents",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-concealmentevents",
             "tags": [
               "web-features:webrtc-stats"
@@ -2487,6 +2490,7 @@
         "estimatedPlayoutTimestamp": {
           "__compat": {
             "description": "`estimatedPlayoutTimestamp` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/estimatedPlayoutTimestamp",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-estimatedplayouttimestamp",
             "tags": [
               "web-features:webrtc-stats"
@@ -2594,6 +2598,7 @@
         "frameHeight": {
           "__compat": {
             "description": "`frameHeight` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/frameHeight",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-frameheight",
             "tags": [
               "web-features:webrtc-stats"
@@ -2629,6 +2634,7 @@
         "framesAssembledFromMultiplePackets": {
           "__compat": {
             "description": "`framesAssembledFromMultiplePackets` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/framesAssembledFromMultiplePackets",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-framesassembledfrommultiplepackets",
             "tags": [
               "web-features:webrtc-stats"
@@ -2701,6 +2707,7 @@
         "framesPerSecond": {
           "__compat": {
             "description": "`framesPerSecond` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/framesPerSecond",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-framespersecond",
             "tags": [
               "web-features:webrtc-stats"
@@ -2736,6 +2743,7 @@
         "framesReceived": {
           "__compat": {
             "description": "`framesReceived` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/framesReceived",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-framesreceived",
             "tags": [
               "web-features:webrtc-stats"
@@ -2771,6 +2779,7 @@
         "frameWidth": {
           "__compat": {
             "description": "`frameWidth` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/frameWidth",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-framewidth",
             "tags": [
               "web-features:webrtc-stats"
@@ -2806,6 +2815,7 @@
         "freezeCount": {
           "__compat": {
             "description": "`freezeCount` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/freezeCount",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-freezecount",
             "tags": [
               "web-features:webrtc-stats"
@@ -2841,6 +2851,7 @@
         "headerBytesReceived": {
           "__compat": {
             "description": "`headerBytesReceived` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/headerBytesReceived",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-headerbytesreceived",
             "tags": [
               "web-features:webrtc-stats"
@@ -2912,6 +2923,7 @@
         "insertedSamplesForDeceleration": {
           "__compat": {
             "description": "`insertedSamplesForDeceleration` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/insertedSamplesForDeceleration",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-insertedsamplesfordeceleration",
             "tags": [
               "web-features:webrtc-stats"
@@ -2947,6 +2959,7 @@
         "jitter": {
           "__compat": {
             "description": "`jitter` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/jitter",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcreceivedrtpstreamstats-jitter",
             "tags": [
               "web-features:webrtc-stats"
@@ -2982,6 +2995,7 @@
         "jitterBufferDelay": {
           "__compat": {
             "description": "`jitterBufferDelay` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/jitterBufferDelay",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-jitterbufferdelay",
             "tags": [
               "web-features:webrtc-stats"
@@ -3017,6 +3031,7 @@
         "jitterBufferEmittedCount": {
           "__compat": {
             "description": "`jitterBufferEmittedCount` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/jitterBufferEmittedCount",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-jitterbufferemittedcount",
             "tags": [
               "web-features:webrtc-stats"
@@ -3052,6 +3067,7 @@
         "jitterBufferMinimumDelay": {
           "__compat": {
             "description": "`jitterBufferMinimumDelay` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/jitterBufferMinimumDelay",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-jitterbufferminimumdelay",
             "tags": [
               "web-features:webrtc-stats"
@@ -3087,6 +3103,7 @@
         "jitterBufferTargetDelay": {
           "__compat": {
             "description": "`jitterBufferTargetDelay` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/jitterBufferTargetDelay",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-jitterbuffertargetdelay",
             "tags": [
               "web-features:webrtc-stats"
@@ -3122,6 +3139,7 @@
         "keyFramesDecoded": {
           "__compat": {
             "description": "`keyFramesDecoded` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/keyFramesDecoded",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-keyframesdecoded",
             "tags": [
               "web-features:webrtc-stats"
@@ -3306,6 +3324,7 @@
         "packetsDiscarded": {
           "__compat": {
             "description": "`packetsDiscarded` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/packetsDiscarded",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-packetsdiscarded",
             "tags": [
               "web-features:webrtc-stats"
@@ -3341,6 +3360,7 @@
         "packetsLost": {
           "__compat": {
             "description": "`packetsLost` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/packetsLost",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcreceivedrtpstreamstats-packetslost",
             "tags": [
               "web-features:webrtc-stats"
@@ -3376,6 +3396,7 @@
         "packetsReceived": {
           "__compat": {
             "description": "`packetsReceived` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/packetsReceived",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcreceivedrtpstreamstats-packetsreceived",
             "tags": [
               "web-features:webrtc-stats"
@@ -3411,6 +3432,7 @@
         "pauseCount": {
           "__compat": {
             "description": "`pauseCount` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/pauseCount",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-pausecount",
             "tags": [
               "web-features:webrtc-stats"
@@ -3446,6 +3468,7 @@
         "playoutId": {
           "__compat": {
             "description": "`playoutId` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/playoutId",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-playoutid",
             "tags": [
               "web-features:webrtc-stats"
@@ -3552,6 +3575,7 @@
         "removedSamplesForAcceleration": {
           "__compat": {
             "description": "`removedSamplesForAcceleration` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/removedSamplesForAcceleration",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-removedsamplesforacceleration",
             "tags": [
               "web-features:webrtc-stats"
@@ -3587,6 +3611,7 @@
         "silentConcealedSamples": {
           "__compat": {
             "description": "`silentConcealedSamples` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/silentConcealedSamples",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-silentconcealedsamples",
             "tags": [
               "web-features:webrtc-stats"
@@ -3694,6 +3719,7 @@
         "totalAssemblyTime": {
           "__compat": {
             "description": "`totalAssemblyTime` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/totalAssemblyTime",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-totalassemblytime",
             "tags": [
               "web-features:webrtc-stats"
@@ -3729,6 +3755,7 @@
         "totalAudioEnergy": {
           "__compat": {
             "description": "`totalAudioEnergy` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/totalAudioEnergy",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-totalaudioenergy",
             "tags": [
               "web-features:webrtc-stats"
@@ -3764,6 +3791,7 @@
         "totalDecodeTime": {
           "__compat": {
             "description": "`totalDecodeTime` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/totalDecodeTime",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-totaldecodetime",
             "tags": [
               "web-features:webrtc-stats"
@@ -3799,6 +3827,7 @@
         "totalFreezesDuration": {
           "__compat": {
             "description": "`totalFreezesDuration` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/totalFreezesDuration",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-totalfreezesduration",
             "tags": [
               "web-features:webrtc-stats"
@@ -3834,6 +3863,7 @@
         "totalInterFrameDelay": {
           "__compat": {
             "description": "`totalInterFrameDelay` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/totalInterFrameDelay",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-totalinterframedelay",
             "tags": [
               "web-features:webrtc-stats"
@@ -3869,6 +3899,7 @@
         "totalPausesDuration": {
           "__compat": {
             "description": "`totalPausesDuration` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/totalPausesDuration",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-totalpausesduration",
             "tags": [
               "web-features:webrtc-stats"
@@ -3904,6 +3935,7 @@
         "totalProcessingDelay": {
           "__compat": {
             "description": "`totalProcessingDelay` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/totalProcessingDelay",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-totalprocessingdelay",
             "tags": [
               "web-features:webrtc-stats"
@@ -3939,6 +3971,7 @@
         "totalSamplesDuration": {
           "__compat": {
             "description": "`totalSamplesDuration` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/totalSamplesDuration",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-totalsamplesduration",
             "tags": [
               "web-features:webrtc-stats"
@@ -3974,6 +4007,7 @@
         "totalSamplesReceived": {
           "__compat": {
             "description": "`totalSamplesReceived` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/totalSamplesReceived",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-totalsamplesreceived",
             "tags": [
               "web-features:webrtc-stats"
@@ -4009,6 +4043,7 @@
         "totalSquaredInterFrameDelay": {
           "__compat": {
             "description": "`totalSquaredInterFrameDelay` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/totalSquaredInterFrameDelay",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-totalsquaredinterframedelay",
             "tags": [
               "web-features:webrtc-stats"
@@ -4044,6 +4079,7 @@
         "trackIdentifier": {
           "__compat": {
             "description": "`trackIdentifier` in 'inbound-rtp' stats",
+            "mdn_url": "https://developer.mozilla.org/docs/Web/API/RTCInboundRtpStreamStats/trackIdentifier",
             "spec_url": "https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-trackidentifier",
             "tags": [
               "web-features:webrtc-stats"
diff --git a/css/selectors/heading.json b/css/selectors/heading.json
index 0bc76012921155..ac859c87e9cb10 100644
--- a/css/selectors/heading.json
+++ b/css/selectors/heading.json
@@ -4,6 +4,7 @@
       "heading": {
         "__compat": {
           "description": "`:heading`",
+          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/:heading",
           "spec_url": "https://drafts.csswg.org/selectors-5/#headings",
           "support": {
             "chrome": {
diff --git a/package-lock.json b/package-lock.json
index 25d2d5e524040a..6a7dacf0145026 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -119,9 +119,9 @@
       }
     },
     "node_modules/@ddbeck/mdn-content-inventory": {
-      "version": "0.2.20250815",
-      "resolved": "https://registry.npmjs.org/@ddbeck/mdn-content-inventory/-/mdn-content-inventory-0.2.20250815.tgz",
-      "integrity": "sha512-0f5JME7JiAZZvuyvD0DSKfN9EQ2eoR2cjeidJQH/lOyrTPqUU5chO2tdrfuMZZTOSyh7H8bxk5Ix7wOLcUFctQ==",
+      "version": "0.2.20250819",
+      "resolved": "https://registry.npmjs.org/@ddbeck/mdn-content-inventory/-/mdn-content-inventory-0.2.20250819.tgz",
+      "integrity": "sha512-IkDmD12k/ieLHM9beVBqZnCQfUsQPhrJ4cLg2D1ldrKLHeiGG94wlWEif5XfFb0a37K3cTayM/XD2jTdBJf7Ow==",
       "dev": true,
       "license": "CC-BY-SA-2.5"
     },