diff --git a/package-lock.json b/package-lock.json
index d3b621624..9ba7e0688 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -107,7 +107,8 @@
     "@ampproject/toolbox-core": {
       "version": "file:packages/core",
       "requires": {
-        "cross-fetch": "3.0.4"
+        "cross-fetch": "3.0.4",
+        "lru-cache": "5.1.1"
       }
     },
     "@ampproject/toolbox-cors": {
@@ -267,21 +268,24 @@
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         "@ampproject/toolbox-validator-rules": "^2.3.0",
         "cssnano": "4.1.10",
+        "dom-serializer": "1.0.1",
         "domhandler": "3.0.0",
         "domutils": "2.1.0",
         "htmlparser2": "4.1.0",
         "lru-cache": "5.1.1",
         "normalize-html-whitespace": "1.0.0",
+        "postcss": "7.0.31",
         "postcss-safe-parser": "4.0.2",
         "terser": "4.7.0"
       },
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-          "version": "0.2.2",
-          "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-0.2.2.tgz",
-          "integrity": "sha512-2/xPb3ORsQ42nHYiSunXkDjPLBaEj/xTwUO4B7XCZQTRk7EBtTOPaygh10YAAh2OI1Qrp6NWfpAhzswj0ydt9g==",
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-1.0.1.tgz",
+          "integrity": "sha512-1Aj1Qy3YLbdslkI75QEOfdp9TkQ3o8LRISAzxOibjBs/xWwr1WxZFOQphFkZuepHFGo+kB8e5FVJSS0faAJ4Rw==",
           "requires": {
             "domelementtype": "^2.0.1",
+            "domhandler": "^3.0.0",
             "entities": "^2.0.0"
           }
         },
@@ -306,6 +310,17 @@
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             "domelementtype": "^2.0.1",
             "domhandler": "^3.0.0"
+          },
+          "dependencies": {
+            "dom-serializer": {
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+              "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-0.2.2.tgz",
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+              "requires": {
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+                "entities": "^2.0.0"
+              }
+            }
           }
         },
         "entities": {
@@ -324,6 +339,24 @@
             "entities": "^2.0.0"
           }
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+        "postcss": {
+          "version": "7.0.26",
+          "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.26.tgz",
+          "integrity": "sha512-IY4oRjpXWYshuTDFxMVkJDtWIk2LhsTlu8bZnbEJA4+bYT16Lvpo8Qv6EvDumhYRgzjZl489pmsY3qVgJQ08nA==",
+          "requires": {
+            "chalk": "^2.4.2",
+            "source-map": "^0.6.1",
+            "supports-color": "^6.1.0"
+          }
+        },
+        "supports-color": {
+          "version": "6.1.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
+          "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
+          "requires": {
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           "resolved": "https://registry.npmjs.org/terser/-/terser-4.7.0.tgz",
@@ -493,19 +526,19 @@
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+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.10.0.tgz",
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       "dev": true,
       "requires": {
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-        "@babel/generator": "^7.9.6",
+        "@babel/generator": "^7.10.0",
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-        "@babel/helpers": "^7.9.6",
-        "@babel/parser": "^7.9.6",
-        "@babel/template": "^7.8.6",
-        "@babel/traverse": "^7.9.6",
-        "@babel/types": "^7.9.6",
+        "@babel/helpers": "^7.10.0",
+        "@babel/parser": "^7.10.0",
+        "@babel/template": "^7.10.0",
+        "@babel/traverse": "^7.10.0",
+        "@babel/types": "^7.10.0",
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         "debug": "^4.1.0",
         "gensync": "^1.0.0-beta.1",
@@ -516,6 +549,63 @@
         "source-map": "^0.5.0"
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+          "dev": true,
+          "requires": {
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+            "jsesc": "^2.5.1",
+            "lodash": "^4.17.13",
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+          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.10.0.tgz",
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+          "dev": true
+        },
+        "@babel/template": {
+          "version": "7.10.0",
+          "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.10.0.tgz",
+          "integrity": "sha512-aMLEQn5tcG49LEWrsEwxiRTdaJmvLem3+JMCMSeCy2TILau0IDVyWdm/18ACx7XOCady64FLt6KkHy28tkDQHQ==",
+          "dev": true,
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+            "@babel/types": "^7.10.0"
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+        "@babel/traverse": {
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+          "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.10.0.tgz",
+          "integrity": "sha512-NZsFleMaLF1zX3NxbtXI/JCs2RPOdpGru6UBdGsfhdsDsP+kFF+h2QQJnMJglxk0kc69YmMFs4A44OJY0tKo5g==",
+          "dev": true,
+          "requires": {
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+            "@babel/generator": "^7.10.0",
+            "@babel/helper-function-name": "^7.9.5",
+            "@babel/helper-split-export-declaration": "^7.8.3",
+            "@babel/parser": "^7.10.0",
+            "@babel/types": "^7.10.0",
+            "debug": "^4.1.0",
+            "globals": "^11.1.0",
+            "lodash": "^4.17.13"
+          }
+        },
+        "@babel/types": {
+          "version": "7.10.0",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.10.0.tgz",
+          "integrity": "sha512-t41W8yWFyQFPOAAvPvjyRhejcLGnJTA3iRpFcDbEKwVJ3UnHQePFzLk8GagTsucJlImyNwrGikGsYURrWbQG8w==",
+          "dev": true,
+          "requires": {
+            "@babel/helper-validator-identifier": "^7.9.5",
+            "lodash": "^4.17.13",
+            "to-fast-properties": "^2.0.0"
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         "semver": {
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           "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
@@ -571,12 +661,25 @@
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+      "version": "7.10.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.10.0.tgz",
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       "dev": true,
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-        "@babel/types": "^7.8.3"
+        "@babel/types": "^7.10.0"
+      },
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+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.10.0.tgz",
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+            "lodash": "^4.17.13",
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@@ -617,12 +720,25 @@
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+      "resolved": "https://registry.npmjs.org/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-7.10.0.tgz",
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       "dev": true,
       "requires": {
-        "@babel/types": "^7.8.3"
+        "@babel/types": "^7.10.0"
+      },
+      "dependencies": {
+        "@babel/types": {
+          "version": "7.10.0",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.10.0.tgz",
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+            "lodash": "^4.17.13",
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@@ -632,15 +748,69 @@
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+      "resolved": "https://registry.npmjs.org/@babel/helper-replace-supers/-/helper-replace-supers-7.10.0.tgz",
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-        "@babel/helper-optimise-call-expression": "^7.8.3",
-        "@babel/traverse": "^7.9.6",
-        "@babel/types": "^7.9.6"
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@@ -669,14 +839,79 @@
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@@ -3983,7 +4218,8 @@
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@@ -5097,7 +5333,8 @@
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@@ -5802,7 +6039,8 @@
     "commander": {
       "version": "2.20.0",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
-      "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ=="
+      "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==",
+      "dev": true
     },
     "compare-func": {
       "version": "1.3.4",
@@ -7054,6 +7292,7 @@
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.1.tgz",
       "integrity": "sha512-1MkrZNvWTKCaigbn+W15elq2BB/L22nqrSY5DKlo3X6+vclJm8Bb5djXJBmEX6fS3+zCh/F4VBK5Z2KxJt4s2Q==",
+      "dev": true,
       "requires": {
         "once": "^1.4.0"
       }
@@ -8492,6 +8731,7 @@
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-5.1.0.tgz",
       "integrity": "sha512-EXr1FOzrzTfGeL0gQdeFEvOMm2mzMOglyiOXSTpPC+iAjAKftbr3jpCMWynogwYnM+eSj9sHGc6wjIcDvYiygw==",
+      "dev": true,
       "requires": {
         "pump": "^3.0.0"
       }
@@ -8921,7 +9161,8 @@
     "graceful-fs": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.0.tgz",
-      "integrity": "sha512-jpSvDPV4Cq/bgtpndIWbI5hmYxhQGHPC4d4cqBPb4DLniCfhJokdXhwhaDuLBGLQdvvRum/UiX6ECVIPvDXqdg=="
+      "integrity": "sha512-jpSvDPV4Cq/bgtpndIWbI5hmYxhQGHPC4d4cqBPb4DLniCfhJokdXhwhaDuLBGLQdvvRum/UiX6ECVIPvDXqdg==",
+      "dev": true
     },
     "growly": {
       "version": "1.3.0",
@@ -9258,7 +9499,8 @@
     "human-signals": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/human-signals/-/human-signals-1.1.1.tgz",
-      "integrity": "sha512-SEQu7vl8KjNL2eoGBLF3+wAjpsNfA9XMlXAYj/3EdaNfAlxKthD1xjEQfGOUhllCGGJVNY34bRr6lPINhNjyZw=="
+      "integrity": "sha512-SEQu7vl8KjNL2eoGBLF3+wAjpsNfA9XMlXAYj/3EdaNfAlxKthD1xjEQfGOUhllCGGJVNY34bRr6lPINhNjyZw==",
+      "dev": true
     },
     "humanize-ms": {
       "version": "1.2.1",
@@ -9948,7 +10190,8 @@
     "is-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-2.0.0.tgz",
-      "integrity": "sha512-XCoy+WlUr7d1+Z8GgSuXmpuUFC9fOhRXglJMx+dwLKTkL44Cjd4W1Z5P+BQZpr+cR93aGP4S/s7Ftw6Nd/kiEw=="
+      "integrity": "sha512-XCoy+WlUr7d1+Z8GgSuXmpuUFC9fOhRXglJMx+dwLKTkL44Cjd4W1Z5P+BQZpr+cR93aGP4S/s7Ftw6Nd/kiEw==",
+      "dev": true
     },
     "is-subset": {
       "version": "0.1.1",
@@ -10020,7 +10263,8 @@
     "isexe": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/isexe/-/isexe-2.0.0.tgz",
-      "integrity": "sha1-6PvzdNxVb/iUehDcsFctYz8s+hA="
+      "integrity": "sha1-6PvzdNxVb/iUehDcsFctYz8s+hA=",
+      "dev": true
     },
     "isobject": {
       "version": "3.0.1",
@@ -12060,9 +12304,9 @@
       }
     },
     "karma-jasmine": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/karma-jasmine/-/karma-jasmine-3.1.1.tgz",
-      "integrity": "sha512-pxBmv5K7IkBRLsFSTOpgiK/HzicQT3mfFF+oHAC7nxMfYKhaYFgxOa5qjnHW4sL5rUnmdkSajoudOnnOdPyW4Q==",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/karma-jasmine/-/karma-jasmine-3.2.0.tgz",
+      "integrity": "sha512-NkMgcMVKZJ2LtxWXXWD+d6OSFf8ehjxhfgpjdx9DgjwpLDpirm66kEc7+S0i4HcTJzgNhyTWutDzzfnbvKJpNg==",
       "dev": true,
       "requires": {
         "jasmine-core": "^3.5.0"
@@ -13234,7 +13478,8 @@
     "merge-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/merge-stream/-/merge-stream-2.0.0.tgz",
-      "integrity": "sha512-abv/qOcuPfk3URPfDzmZU1LKmuw8kT+0nIHvKrKgFrwifol/doWcdA4ZqsWQ8ENrFKkd67Mfpo/LovbIUsbt3w=="
+      "integrity": "sha512-abv/qOcuPfk3URPfDzmZU1LKmuw8kT+0nIHvKrKgFrwifol/doWcdA4ZqsWQ8ENrFKkd67Mfpo/LovbIUsbt3w==",
+      "dev": true
     },
     "merge2": {
       "version": "1.3.0",
@@ -13375,7 +13620,8 @@
     "mimic-fn": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/mimic-fn/-/mimic-fn-2.1.0.tgz",
-      "integrity": "sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg=="
+      "integrity": "sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==",
+      "dev": true
     },
     "min-document": {
       "version": "2.19.0",
@@ -14372,6 +14618,7 @@
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/npm-run-path/-/npm-run-path-4.0.1.tgz",
       "integrity": "sha512-S48WzZW777zhNIrn7gxOlISNAqi9ZC/uQFnRdbeIHhZhCA6UqpkOT8T1G7BvfdgP4Er8gF4sUbaS0i7QvIfCWw==",
+      "dev": true,
       "requires": {
         "path-key": "^3.0.0"
       },
@@ -14379,7 +14626,8 @@
         "path-key": {
           "version": "3.1.1",
           "resolved": "https://registry.npmjs.org/path-key/-/path-key-3.1.1.tgz",
-          "integrity": "sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q=="
+          "integrity": "sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==",
+          "dev": true
         }
       }
     },
@@ -14649,6 +14897,7 @@
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
       "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+      "dev": true,
       "requires": {
         "wrappy": "1"
       }
@@ -14657,6 +14906,7 @@
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/onetime/-/onetime-5.1.0.tgz",
       "integrity": "sha512-5NcSkPHhwTVFIQN+TUqXoS5+dlElHXdpAWu9I0HP20YOtIi+aZ0Ct82jdlILDxjLEAWwvm+qj1m6aEtsDVmm6Q==",
+      "dev": true,
       "requires": {
         "mimic-fn": "^2.1.0"
       }
@@ -16092,6 +16342,7 @@
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
       "integrity": "sha512-LwZy+p3SFs1Pytd/jYct4wpv49HiYCqd9Rlc5ZVdk0V+8Yzv6jR5Blk3TRmPL1ft69TxP0IMZGJ+WPFU2BFhww==",
+      "dev": true,
       "requires": {
         "end-of-stream": "^1.1.0",
         "once": "^1.3.1"
@@ -17227,7 +17478,8 @@
     "signal-exit": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
-      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0="
+      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
+      "dev": true
     },
     "simple-swizzle": {
       "version": "0.2.2",
@@ -17574,6 +17826,7 @@
       "version": "0.5.16",
       "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.16.tgz",
       "integrity": "sha512-efyLRJDr68D9hBBNIPWFjhpFzURh+KJykQwvMyW5UiZzYwoF6l4YMMDIJJEyFWxWCqfyxLzz6tSfUFR+kXXsVQ==",
+      "dev": true,
       "requires": {
         "buffer-from": "^1.0.0",
         "source-map": "^0.6.0"
@@ -18153,7 +18406,8 @@
     "strip-final-newline": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/strip-final-newline/-/strip-final-newline-2.0.0.tgz",
-      "integrity": "sha512-BrpvfNAE3dcvq7ll3xVumzjKjZQ5tI1sEUIKr3Uoks0XUl45St3FlatVqef9prk4jRDzhW6WZg+3bk93y6pLjA=="
+      "integrity": "sha512-BrpvfNAE3dcvq7ll3xVumzjKjZQ5tI1sEUIKr3Uoks0XUl45St3FlatVqef9prk4jRDzhW6WZg+3bk93y6pLjA==",
+      "dev": true
     },
     "strip-indent": {
       "version": "3.0.0",
@@ -19599,7 +19853,8 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
     },
     "write": {
       "version": "1.0.3",
diff --git a/package.json b/package.json
index 87058945b..1e522b877 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
   },
   "devDependencies": {
     "@ampproject/rollup-plugin-closure-compiler": "0.25.2",
-    "@babel/core": "7.9.6",
+    "@babel/core": "7.10.0",
     "@types/cheerio": "0.22.18",
     "@types/debug": "4.1.5",
     "@types/diff": "4.0.2",
@@ -46,7 +46,7 @@
     "js-beautify": "1.11.0",
     "karma": "5.0.9",
     "karma-chrome-launcher": "3.1.0",
-    "karma-jasmine": "3.1.1",
+    "karma-jasmine": "3.2.0",
     "lerna": "3.22.0",
     "lerna-changelog": "1.0.1",
     "lighthouse": "6.0.0",
diff --git a/packages/core/package.json b/packages/core/package.json
index 94bb0d888..468f0d25d 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -22,7 +22,8 @@
   },
   "homepage": "https://github.com/ampproject/amp-toolbox/tree/master/packages/core",
   "dependencies": {
-    "cross-fetch": "3.0.4"
+    "cross-fetch": "3.0.4",
+    "lru-cache": "5.1.1"
   },
   "gitHead": "aeceb5cb83cc111c08297415ab469696f2f7994e"
 }
diff --git a/packages/optimizer/lib/TreeParser.js b/packages/optimizer/lib/TreeParser.js
index 0263ff1ba..a4ec31ab5 100644
--- a/packages/optimizer/lib/TreeParser.js
+++ b/packages/optimizer/lib/TreeParser.js
@@ -18,7 +18,7 @@
 const {Parser} = require('htmlparser2');
 const {DomHandler, NodeWithChildren} = require('domhandler');
 const {appendAll} = require('./NodeUtils');
-const serialize = require('dom-serializer');
+const render = require('dom-serializer').default;
 
 // https://github.com/fb55/domhandler#option-normalizewhitespace
 const PARSER_OPTIONS = {};
@@ -61,7 +61,7 @@ class TreeParser {
    * @param {Tree} tree
    */
   serialize(node) {
-    return serialize(node, {});
+    return render(node, {});
   }
 }
 
diff --git a/packages/optimizer/package.json b/packages/optimizer/package.json
index f9c1aa426..8922534c4 100644
--- a/packages/optimizer/package.json
+++ b/packages/optimizer/package.json
@@ -34,11 +34,13 @@
     "@ampproject/toolbox-script-csp": "^2.3.0",
     "@ampproject/toolbox-validator-rules": "^2.3.0",
     "cssnano": "4.1.10",
+    "dom-serializer": "1.0.1",
     "domhandler": "3.0.0",
     "domutils": "2.1.0",
     "htmlparser2": "4.1.0",
     "lru-cache": "5.1.1",
     "normalize-html-whitespace": "1.0.0",
+    "postcss": "7.0.31",
     "postcss-safe-parser": "4.0.2",
     "terser": "4.7.0"
   },