diff --git a/packages/core/src/generators/metadata/maps/mdn.json b/packages/core/src/generators/metadata/maps/mdn.json
index f27807cd6..d0e6963cf 100644
--- a/packages/core/src/generators/metadata/maps/mdn.json
+++ b/packages/core/src/generators/metadata/maps/mdn.json
@@ -227,6 +227,7 @@
   "ext_disjoint_timer_query": "https://developer.mozilla.org/docs/Web/API/EXT_disjoint_timer_query",
   "ext_float_blend": "https://developer.mozilla.org/docs/Web/API/EXT_float_blend",
   "ext_frag_depth": "https://developer.mozilla.org/docs/Web/API/EXT_frag_depth",
+  "ext_polygon_offset_clamp": "https://developer.mozilla.org/docs/Web/API/EXT_polygon_offset_clamp",
   "ext_srgb": "https://developer.mozilla.org/docs/Web/API/EXT_sRGB",
   "ext_shader_texture_lod": "https://developer.mozilla.org/docs/Web/API/EXT_shader_texture_lod",
   "ext_texture_compression_bptc": "https://developer.mozilla.org/docs/Web/API/EXT_texture_compression_bptc",
@@ -579,6 +580,7 @@
   "paymentrequestupdateevent": "https://developer.mozilla.org/docs/Web/API/PaymentRequestUpdateEvent",
   "paymentresponse": "https://developer.mozilla.org/docs/Web/API/PaymentResponse",
   "performance": "https://developer.mozilla.org/docs/Web/API/Window/performance",
+  "performancecontainertiming": "https://developer.mozilla.org/docs/Web/API/PerformanceContainerTiming",
   "performanceelementtiming": "https://developer.mozilla.org/docs/Web/API/PerformanceElementTiming",
   "performanceentry": "https://developer.mozilla.org/docs/Web/API/PerformanceEntry",
   "performanceeventtiming": "https://developer.mozilla.org/docs/Web/API/PerformanceEventTiming",