diff --git a/client/main.js b/client/main.js
index 1126e06a8..d07aa71af 100644
--- a/client/main.js
+++ b/client/main.js
@@ -1,7 +1,6 @@
 /* global io */
 /* eslint-disable no-new */
 
-require('core-js/stable')
 var Karma = require('./karma')
 var StatusUpdater = require('./updater')
 var util = require('../common/util')
diff --git a/common/stringify.js b/common/stringify.js
index 491a08d87..d612b69af 100644
--- a/common/stringify.js
+++ b/common/stringify.js
@@ -1,4 +1,10 @@
-var serialize = require('dom-serialize')
+var serialize = null
+try {
+  serialize = require('dom-serialize')
+} catch (e) {
+  // Ignore failure on IE8
+}
+
 var instanceOf = require('./util').instanceOf
 
 function isNode (obj) {
@@ -56,7 +62,11 @@ function stringify (obj, depth) {
       } else if (obj.outerHTML) {
         return obj.outerHTML
       } else if (isNode(obj)) {
-        return serialize(obj)
+        if (serialize) {
+          return serialize(obj)
+        } else {
+          return 'Skipping stringify, no support for dom-serialize'
+        }
       } else if (instanceOf(obj, 'Error')) {
         return obj.toString() + '\n' + obj.stack
       } else {
diff --git a/package-lock.json b/package-lock.json
index 63892a275..73d2aba6c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "karma",
-  "version": "4.2.0",
+  "version": "4.3.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -10,7 +10,7 @@
       "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
       "dev": true,
       "requires": {
-        "@babel/highlight": "7.5.0"
+        "@babel/highlight": "^7.0.0"
       }
     },
     "@babel/highlight": {
@@ -19,9 +19,9 @@
       "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
       "dev": true,
       "requires": {
-        "chalk": "2.4.2",
-        "esutils": "2.0.2",
-        "js-tokens": "4.0.0"
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
       }
     },
     "@sinonjs/commons": {
@@ -39,8 +39,8 @@
       "integrity": "sha512-tsHvOB24rvyvV2+zKMmPkZ7dXX6LSLKZ7aOtXY6Edklp0uRcgGpOsQTTGTcWViFyx4uhWc6GV8QdnALbIbIdeQ==",
       "dev": true,
       "requires": {
-        "@sinonjs/commons": "1.4.0",
-        "@sinonjs/samsam": "3.3.2"
+        "@sinonjs/commons": "^1",
+        "@sinonjs/samsam": "^3.1.0"
       }
     },
     "@sinonjs/samsam": {
@@ -49,9 +49,9 @@
       "integrity": "sha512-ILO/rR8LfAb60Y1Yfp9vxfYAASK43NFC2mLzpvLUbCQY/Qu8YwReboseu8aheCEkyElZF2L2T9mHcR2bgdvZyA==",
       "dev": true,
       "requires": {
-        "@sinonjs/commons": "1.4.0",
-        "array-from": "2.1.1",
-        "lodash": "4.17.15"
+        "@sinonjs/commons": "^1.0.2",
+        "array-from": "^2.1.1",
+        "lodash": "^4.17.11"
       }
     },
     "@sinonjs/text-encoding": {
@@ -66,8 +66,8 @@
       "integrity": "sha512-E+iruNOY8VV9s4JEbe1aNEm6MiszPRr/UfcHMz0TQh1BXSxHK+ASV1R6W4HpjBhSeS+54PIsAMCBmwD06LLsqQ==",
       "dev": true,
       "requires": {
-        "jsonparse": "1.3.1",
-        "through": "2.3.8"
+        "jsonparse": "^1.2.0",
+        "through": ">=2.2.7 <3"
       }
     },
     "abbrev": {
@@ -81,7 +81,7 @@
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
       "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
       "requires": {
-        "mime-types": "2.1.24",
+        "mime-types": "~2.1.24",
         "negotiator": "0.6.2"
       }
     },
@@ -109,10 +109,10 @@
       "integrity": "sha512-XhahLSsCB6X6CJbe+uNu3Mn9sJBNFxtBN9NLgAOQovfS6Kh0lDUtmlclhjn9CvEK7A7YyRU13PXlNcpSiLI9Yw==",
       "dev": true,
       "requires": {
-        "acorn": "6.2.1",
-        "acorn-dynamic-import": "4.0.0",
-        "acorn-walk": "6.2.0",
-        "xtend": "4.0.2"
+        "acorn": "^6.1.1",
+        "acorn-dynamic-import": "^4.0.0",
+        "acorn-walk": "^6.1.1",
+        "xtend": "^4.0.1"
       }
     },
     "acorn-walk": {
@@ -132,7 +132,7 @@
       "integrity": "sha512-salcGninV0nPrwpGNn4VTXBb1SOuXQBiqbrNXoeizJsHrsL6ERFM2Ne3JUSBWRE6aeNJI2ROP/WEEIDUiDe3cg==",
       "dev": true,
       "requires": {
-        "es6-promisify": "5.0.0"
+        "es6-promisify": "^5.0.0"
       }
     },
     "ajv": {
@@ -141,10 +141,10 @@
       "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
       "dev": true,
       "requires": {
-        "fast-deep-equal": "2.0.1",
-        "fast-json-stable-stringify": "2.0.0",
-        "json-schema-traverse": "0.4.1",
-        "uri-js": "4.2.2"
+        "fast-deep-equal": "^2.0.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
       }
     },
     "ansi-escapes": {
@@ -165,7 +165,7 @@
       "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
       "dev": true,
       "requires": {
-        "color-convert": "1.9.3"
+        "color-convert": "^1.9.0"
       }
     },
     "any-promise": {
@@ -180,8 +180,8 @@
       "integrity": "sha512-5teOsQWABXHHBFP9y3skS5P3d/WfWXpv3FUpy+LorMrNYaT9pI4oLMQX7jzQ2KklNpGpWHzdCXTDT2Y3XGlZBw==",
       "dev": true,
       "requires": {
-        "micromatch": "3.1.10",
-        "normalize-path": "2.1.1"
+        "micromatch": "^3.1.4",
+        "normalize-path": "^2.1.1"
       },
       "dependencies": {
         "normalize-path": {
@@ -190,7 +190,7 @@
           "integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
           "dev": true,
           "requires": {
-            "remove-trailing-separator": "1.1.0"
+            "remove-trailing-separator": "^1.0.1"
           }
         }
       }
@@ -209,8 +209,8 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "delegates": "1.0.0",
-        "readable-stream": "2.3.6"
+        "delegates": "^1.0.0",
+        "readable-stream": "^2.0.6"
       }
     },
     "argparse": {
@@ -219,7 +219,7 @@
       "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
       "dev": true,
       "requires": {
-        "sprintf-js": "1.0.3"
+        "sprintf-js": "~1.0.2"
       }
     },
     "arr-diff": {
@@ -282,8 +282,8 @@
       "integrity": "sha1-GEtI9i2S10UrsxsyMWXH+L0CJm0=",
       "dev": true,
       "requires": {
-        "define-properties": "1.1.3",
-        "es-abstract": "1.13.0"
+        "define-properties": "^1.1.2",
+        "es-abstract": "^1.7.0"
       }
     },
     "array-map": {
@@ -310,7 +310,7 @@
       "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
       "dev": true,
       "requires": {
-        "array-uniq": "1.0.3"
+        "array-uniq": "^1.0.1"
       }
     },
     "array-uniq": {
@@ -342,9 +342,9 @@
       "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
       "dev": true,
       "requires": {
-        "bn.js": "4.11.8",
-        "inherits": "2.0.4",
-        "minimalistic-assert": "1.0.1"
+        "bn.js": "^4.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0"
       }
     },
     "assert": {
@@ -353,7 +353,7 @@
       "integrity": "sha512-EDsgawzwoun2CZkCgtxJbv392v4nbk9XDD06zI+kQYoBM/3RBWLlEyJARDOmhAAosBjWACEkKL6S+lIZtcAubA==",
       "dev": true,
       "requires": {
-        "object-assign": "4.1.1",
+        "object-assign": "^4.1.1",
         "util": "0.10.3"
       },
       "dependencies": {
@@ -392,9 +392,9 @@
       "integrity": "sha512-cjC3jUCh9spkroKue5PDSKH5RFQ/KNuZJhk3GwHYmB/8qqETxLOmMdLH+ohi/VukNzxDlMvIe7zScvLoOdhb6Q==",
       "dev": true,
       "requires": {
-        "diff": "3.5.0",
-        "pad-right": "0.2.2",
-        "repeat-string": "1.6.1"
+        "diff": "^3.0.0",
+        "pad-right": "^0.2.2",
+        "repeat-string": "^1.6.1"
       }
     },
     "assign-symbols": {
@@ -414,7 +414,7 @@
       "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
       "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
       "requires": {
-        "lodash": "4.17.15"
+        "lodash": "^4.17.14"
       }
     },
     "async-each": {
@@ -446,8 +446,8 @@
       "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
       "dev": true,
       "requires": {
-        "core-js": "2.6.9",
-        "regenerator-runtime": "0.11.1"
+        "core-js": "^2.4.0",
+        "regenerator-runtime": "^0.11.0"
       },
       "dependencies": {
         "core-js": {
@@ -474,13 +474,13 @@
       "integrity": "sha512-5T6P4xPgpp0YDFvSWwEZ4NoE3aM4QBQXDzmVbraCkFj8zHM+mba8SyqB5DbZWyR7mYHo6Y7BdQo3MoA4m0TeQg==",
       "dev": true,
       "requires": {
-        "cache-base": "1.0.1",
-        "class-utils": "0.3.6",
-        "component-emitter": "1.2.1",
-        "define-property": "1.0.0",
-        "isobject": "3.0.1",
-        "mixin-deep": "1.3.2",
-        "pascalcase": "0.1.1"
+        "cache-base": "^1.0.1",
+        "class-utils": "^0.3.5",
+        "component-emitter": "^1.2.1",
+        "define-property": "^1.0.0",
+        "isobject": "^3.0.1",
+        "mixin-deep": "^1.2.0",
+        "pascalcase": "^0.1.1"
       },
       "dependencies": {
         "define-property": {
@@ -489,7 +489,7 @@
           "integrity": "sha1-dp66rz9KY6rTr56NMEybvnm/sOY=",
           "dev": true,
           "requires": {
-            "is-descriptor": "1.0.2"
+            "is-descriptor": "^1.0.0"
           }
         },
         "is-accessor-descriptor": {
@@ -498,7 +498,7 @@
           "integrity": "sha512-m5hnHTkcVsPfqx3AKlyttIPb7J+XykHvJP2B9bZDjlhLIoEq4XoK64Vg7boZlVWYK6LUY94dYPEE7Lh0ZkZKcQ==",
           "dev": true,
           "requires": {
-            "kind-of": "6.0.2"
+            "kind-of": "^6.0.0"
           }
         },
         "is-data-descriptor": {
@@ -507,7 +507,7 @@
           "integrity": "sha512-jbRXy1FmtAoCjQkVmIVYwuuqDFUbaOeDjmed1tOGPrsMhtJA4rD9tkgA0F1qJ3gRFRXcHYVkdeaP50Q5rE/jLQ==",
           "dev": true,
           "requires": {
-            "kind-of": "6.0.2"
+            "kind-of": "^6.0.0"
           }
         },
         "is-descriptor": {
@@ -516,9 +516,9 @@
           "integrity": "sha512-2eis5WqQGV7peooDyLmNEPUrps9+SXX5c9pL3xEB+4e9HnGuDa7mB7kHxHw4CbqS9k1T2hOH3miL8n8WtiYVtg==",
           "dev": true,
           "requires": {
-            "is-accessor-descriptor": "1.0.0",
-            "is-data-descriptor": "1.0.0",
-            "kind-of": "6.0.2"
+            "is-accessor-descriptor": "^1.0.0",
+            "is-data-descriptor": "^1.0.0",
+            "kind-of": "^6.0.2"
           }
         }
       }
@@ -580,10 +580,10 @@
       "integrity": "sha1-5LoM5BCkaTYyM2dgnstOZVMSUGk=",
       "dev": true,
       "requires": {
-        "continuable-cache": "0.3.1",
-        "error": "7.0.2",
-        "raw-body": "1.1.7",
-        "safe-json-parse": "1.0.1"
+        "continuable-cache": "^0.3.1",
+        "error": "^7.0.0",
+        "raw-body": "~1.1.0",
+        "safe-json-parse": "~1.0.1"
       },
       "dependencies": {
         "bytes": {
@@ -598,8 +598,8 @@
           "integrity": "sha1-HQJ8K/oRasxmI7yo8AAWVyqH1CU=",
           "dev": true,
           "requires": {
-            "bytes": "1.0.0",
-            "string_decoder": "0.10.31"
+            "bytes": "1",
+            "string_decoder": "0.10"
           }
         },
         "string_decoder": {
@@ -616,15 +616,15 @@
       "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
       "requires": {
         "bytes": "3.1.0",
-        "content-type": "1.0.4",
+        "content-type": "~1.0.4",
         "debug": "2.6.9",
-        "depd": "1.1.2",
+        "depd": "~1.1.2",
         "http-errors": "1.7.2",
         "iconv-lite": "0.4.24",
-        "on-finished": "2.3.0",
+        "on-finished": "~2.3.0",
         "qs": "6.7.0",
         "raw-body": "2.4.0",
-        "type-is": "1.6.18"
+        "type-is": "~1.6.17"
       }
     },
     "brace-expansion": {
@@ -632,7 +632,7 @@
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
       "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
       "requires": {
-        "balanced-match": "1.0.0",
+        "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
       }
     },
@@ -641,7 +641,7 @@
       "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
       "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
       "requires": {
-        "fill-range": "7.0.1"
+        "fill-range": "^7.0.1"
       }
     },
     "brorand": {
@@ -656,12 +656,12 @@
       "integrity": "sha512-erYug8XoqzU3IfcU8fUgyHqyOXqIE4tUTTQ+7mqUjQlvnXkOO6OlT9c/ZoJVHYoAaqGxr09CN53G7XIsO4KtWA==",
       "dev": true,
       "requires": {
-        "JSONStream": "1.3.5",
-        "combine-source-map": "0.8.0",
-        "defined": "1.0.0",
-        "safe-buffer": "5.2.0",
-        "through2": "2.0.5",
-        "umd": "3.0.3"
+        "JSONStream": "^1.0.3",
+        "combine-source-map": "~0.8.0",
+        "defined": "^1.0.0",
+        "safe-buffer": "^5.1.1",
+        "through2": "^2.0.0",
+        "umd": "^3.0.0"
       }
     },
     "browser-resolve": {
@@ -693,54 +693,54 @@
       "integrity": "sha512-BWaaD7alyGZVEBBwSTYx4iJF5DswIGzK17o8ai9w4iKRbYpk3EOiprRHMRRA8DCZFmFeOdx7A385w2XdFvxWmg==",
       "dev": true,
       "requires": {
-        "JSONStream": "1.3.5",
-        "assert": "1.5.0",
-        "browser-pack": "6.1.0",
-        "browser-resolve": "1.11.3",
-        "browserify-zlib": "0.2.0",
-        "buffer": "5.2.1",
-        "cached-path-relative": "1.0.2",
-        "concat-stream": "1.6.2",
-        "console-browserify": "1.1.0",
-        "constants-browserify": "1.0.0",
-        "crypto-browserify": "3.12.0",
-        "defined": "1.0.0",
-        "deps-sort": "2.0.0",
-        "domain-browser": "1.2.0",
-        "duplexer2": "0.1.4",
-        "events": "2.1.0",
-        "glob": "7.1.4",
-        "has": "1.0.3",
-        "htmlescape": "1.1.1",
-        "https-browserify": "1.0.0",
-        "inherits": "2.0.4",
-        "insert-module-globals": "7.2.0",
-        "labeled-stream-splicer": "2.0.2",
-        "mkdirp": "0.5.1",
-        "module-deps": "6.2.1",
-        "os-browserify": "0.3.0",
-        "parents": "1.0.1",
-        "path-browserify": "0.0.1",
-        "process": "0.11.10",
-        "punycode": "1.4.1",
-        "querystring-es3": "0.2.1",
-        "read-only-stream": "2.0.0",
-        "readable-stream": "2.3.6",
-        "resolve": "1.11.1",
-        "shasum": "1.0.2",
-        "shell-quote": "1.6.1",
-        "stream-browserify": "2.0.2",
-        "stream-http": "2.8.3",
-        "string_decoder": "1.2.0",
-        "subarg": "1.0.0",
-        "syntax-error": "1.4.0",
-        "through2": "2.0.5",
-        "timers-browserify": "1.4.2",
+        "JSONStream": "^1.0.3",
+        "assert": "^1.4.0",
+        "browser-pack": "^6.0.1",
+        "browser-resolve": "^1.11.0",
+        "browserify-zlib": "~0.2.0",
+        "buffer": "^5.0.2",
+        "cached-path-relative": "^1.0.0",
+        "concat-stream": "^1.6.0",
+        "console-browserify": "^1.1.0",
+        "constants-browserify": "~1.0.0",
+        "crypto-browserify": "^3.0.0",
+        "defined": "^1.0.0",
+        "deps-sort": "^2.0.0",
+        "domain-browser": "^1.2.0",
+        "duplexer2": "~0.1.2",
+        "events": "^2.0.0",
+        "glob": "^7.1.0",
+        "has": "^1.0.0",
+        "htmlescape": "^1.1.0",
+        "https-browserify": "^1.0.0",
+        "inherits": "~2.0.1",
+        "insert-module-globals": "^7.0.0",
+        "labeled-stream-splicer": "^2.0.0",
+        "mkdirp": "^0.5.0",
+        "module-deps": "^6.0.0",
+        "os-browserify": "~0.3.0",
+        "parents": "^1.0.1",
+        "path-browserify": "~0.0.0",
+        "process": "~0.11.0",
+        "punycode": "^1.3.2",
+        "querystring-es3": "~0.2.0",
+        "read-only-stream": "^2.0.0",
+        "readable-stream": "^2.0.2",
+        "resolve": "^1.1.4",
+        "shasum": "^1.0.0",
+        "shell-quote": "^1.6.1",
+        "stream-browserify": "^2.0.0",
+        "stream-http": "^2.0.0",
+        "string_decoder": "^1.1.1",
+        "subarg": "^1.0.0",
+        "syntax-error": "^1.1.1",
+        "through2": "^2.0.0",
+        "timers-browserify": "^1.0.1",
         "tty-browserify": "0.0.1",
-        "url": "0.11.0",
-        "util": "0.10.4",
-        "vm-browserify": "1.1.0",
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-        "resolve": "1.11.1"
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-        "randombytes": "2.1.0",
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-        "rimraf": "2.6.3",
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+            "async-limiter": "~1.0.0"
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       "requires": {
-        "prelude-ls": "1.1.2"
+        "prelude-ls": "~1.1.2"
       }
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@@ -8216,7 +8211,7 @@
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       "requires": {
         "media-typer": "0.3.0",
-        "mime-types": "2.1.24"
+        "mime-types": "~2.1.24"
       }
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@@ -8232,8 +8227,8 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "commander": "2.20.0",
-        "source-map": "0.6.1"
+        "commander": "~2.20.0",
+        "source-map": "~0.6.1"
       }
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     "ultron": {
@@ -8259,11 +8254,11 @@
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       "dev": true,
       "requires": {
-        "acorn-node": "1.7.0",
-        "dash-ast": "1.0.0",
-        "get-assigned-identifiers": "1.2.0",
-        "simple-concat": "1.0.0",
-        "xtend": "4.0.2"
+        "acorn-node": "^1.3.0",
+        "dash-ast": "^1.0.0",
+        "get-assigned-identifiers": "^1.2.0",
+        "simple-concat": "^1.0.0",
+        "xtend": "^4.0.1"
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@@ -8272,8 +8267,8 @@
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       "dev": true,
       "requires": {
-        "sprintf-js": "1.0.3",
-        "util-deprecate": "1.0.2"
+        "sprintf-js": "^1.0.3",
+        "util-deprecate": "^1.0.2"
       }
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@@ -8282,10 +8277,10 @@
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       "dev": true,
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-        "get-value": "2.0.6",
-        "is-extendable": "0.1.1",
-        "set-value": "2.0.1"
+        "arr-union": "^3.1.0",
+        "get-value": "^2.0.6",
+        "is-extendable": "^0.1.1",
+        "set-value": "^2.0.1"
       }
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     "universalify": {
@@ -8304,8 +8299,8 @@
       "integrity": "sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=",
       "dev": true,
       "requires": {
-        "has-value": "0.3.1",
-        "isobject": "3.0.1"
+        "has-value": "^0.3.1",
+        "isobject": "^3.0.0"
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@@ -8314,9 +8309,9 @@
           "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
           "dev": true,
           "requires": {
-            "get-value": "2.0.6",
-            "has-values": "0.1.4",
-            "isobject": "2.1.0"
+            "get-value": "^2.0.3",
+            "has-values": "^0.1.4",
+            "isobject": "^2.0.0"
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@@ -8356,7 +8351,7 @@
       "integrity": "sha1-XXm+3P8UQZUY/S7bCgUHybaFkRU=",
       "dev": true,
       "requires": {
-        "upper-case": "1.1.3"
+        "upper-case": "^1.1.1"
       }
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     "uri-js": {
@@ -8365,7 +8360,7 @@
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       "dev": true,
       "requires": {
-        "punycode": "2.1.1"
+        "punycode": "^2.1.0"
       },
       "dependencies": {
         "punycode": {
@@ -8411,8 +8406,8 @@
       "resolved": "https://registry.npmjs.org/useragent/-/useragent-2.3.0.tgz",
       "integrity": "sha512-4AoH4pxuSvHCjqLO04sU6U/uE65BYza8l/KKBS0b0hnUPWi+cQ2BpeTEwejCSx9SPV5/U03nniDTrWx5NrmKdw==",
       "requires": {
-        "lru-cache": "4.1.5",
-        "tmp": "0.0.33"
+        "lru-cache": "4.1.x",
+        "tmp": "0.0.x"
       }
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     "util": {
@@ -8455,7 +8450,7 @@
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       "dev": true,
       "requires": {
-        "homedir-polyfill": "1.0.3"
+        "homedir-polyfill": "^1.0.1"
       }
     },
     "validate-commit-msg": {
@@ -8464,8 +8459,8 @@
       "integrity": "sha1-5Tg2kQEsuycNzAvCpO/+vhSJDqw=",
       "dev": true,
       "requires": {
-        "conventional-commit-types": "2.1.1",
-        "find-parent-dir": "0.3.0",
+        "conventional-commit-types": "^2.0.0",
+        "find-parent-dir": "^0.3.0",
         "findup": "0.1.5",
         "semver-regex": "1.0.0"
       }
@@ -8476,8 +8471,8 @@
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       "dev": true,
       "requires": {
-        "spdx-correct": "3.1.0",
-        "spdx-expression-parse": "3.0.0"
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
       }
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     "verror": {
@@ -8486,9 +8481,9 @@
       "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
       "dev": true,
       "requires": {
-        "assert-plus": "1.0.0",
+        "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
-        "extsprintf": "1.4.0"
+        "extsprintf": "^1.2.0"
       }
     },
     "vm-browserify": {
@@ -8508,13 +8503,13 @@
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       "dev": true,
       "requires": {
-        "anymatch": "2.0.0",
-        "browserify": "16.3.0",
-        "chokidar": "2.1.6",
-        "defined": "1.0.0",
-        "outpipe": "1.1.1",
-        "through2": "2.0.5",
-        "xtend": "4.0.2"
+        "anymatch": "^2.0.0",
+        "browserify": "^16.1.0",
+        "chokidar": "^2.1.1",
+        "defined": "^1.0.0",
+        "outpipe": "^1.1.0",
+        "through2": "^2.0.0",
+        "xtend": "^4.0.0"
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@@ -8529,16 +8524,16 @@
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           "dev": true,
           "requires": {
-            "arr-flatten": "1.1.0",
-            "array-unique": "0.3.2",
-            "extend-shallow": "2.0.1",
-            "fill-range": "4.0.0",
-            "isobject": "3.0.1",
-            "repeat-element": "1.1.3",
-            "snapdragon": "0.8.2",
-            "snapdragon-node": "2.1.1",
-            "split-string": "3.1.0",
-            "to-regex": "3.0.2"
+            "arr-flatten": "^1.1.0",
+            "array-unique": "^0.3.2",
+            "extend-shallow": "^2.0.1",
+            "fill-range": "^4.0.0",
+            "isobject": "^3.0.1",
+            "repeat-element": "^1.1.2",
+            "snapdragon": "^0.8.1",
+            "snapdragon-node": "^2.0.1",
+            "split-string": "^3.0.2",
+            "to-regex": "^3.0.1"
           }
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         "chokidar": {
@@ -8547,18 +8542,18 @@
           "integrity": "sha512-V2jUo67OKkc6ySiRpJrjlpJKl9kDuG+Xb8VgsGzb+aEouhgS1D0weyPU4lEzdAcsCAvrih2J2BqyXqHWvVLw5g==",
           "dev": true,
           "requires": {
-            "anymatch": "2.0.0",
-            "async-each": "1.0.3",
-            "braces": "2.3.2",
-            "fsevents": "1.2.9",
-            "glob-parent": "3.1.0",
-            "inherits": "2.0.4",
-            "is-binary-path": "1.0.1",
-            "is-glob": "4.0.1",
-            "normalize-path": "3.0.0",
-            "path-is-absolute": "1.0.1",
-            "readdirp": "2.2.1",
-            "upath": "1.1.2"
+            "anymatch": "^2.0.0",
+            "async-each": "^1.0.1",
+            "braces": "^2.3.2",
+            "fsevents": "^1.2.7",
+            "glob-parent": "^3.1.0",
+            "inherits": "^2.0.3",
+            "is-binary-path": "^1.0.0",
+            "is-glob": "^4.0.0",
+            "normalize-path": "^3.0.0",
+            "path-is-absolute": "^1.0.0",
+            "readdirp": "^2.2.1",
+            "upath": "^1.1.1"
           }
         },
         "extend-shallow": {
@@ -8567,7 +8562,7 @@
           "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
           "dev": true,
           "requires": {
-            "is-extendable": "0.1.1"
+            "is-extendable": "^0.1.0"
           }
         },
         "fill-range": {
@@ -8576,10 +8571,10 @@
           "integrity": "sha1-1USBHUKPmOsGpj3EAtJAPDKMOPc=",
           "dev": true,
           "requires": {
-            "extend-shallow": "2.0.1",
-            "is-number": "3.0.0",
-            "repeat-string": "1.6.1",
-            "to-regex-range": "2.1.1"
+            "extend-shallow": "^2.0.1",
+            "is-number": "^3.0.0",
+            "repeat-string": "^1.6.1",
+            "to-regex-range": "^2.1.0"
           }
         },
         "fsevents": {
@@ -8589,8 +8584,8 @@
           "dev": true,
           "optional": true,
           "requires": {
-            "nan": "2.14.0",
-            "node-pre-gyp": "0.12.0"
+            "nan": "^2.12.1",
+            "node-pre-gyp": "^0.12.0"
           }
         },
         "glob-parent": {
@@ -8599,8 +8594,8 @@
           "integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=",
           "dev": true,
           "requires": {
-            "is-glob": "3.1.0",
-            "path-dirname": "1.0.2"
+            "is-glob": "^3.1.0",
+            "path-dirname": "^1.0.0"
           },
           "dependencies": {
             "is-glob": {
@@ -8609,7 +8604,7 @@
               "integrity": "sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=",
               "dev": true,
               "requires": {
-                "is-extglob": "2.1.1"
+                "is-extglob": "^2.1.0"
               }
             }
           }
@@ -8620,7 +8615,7 @@
           "integrity": "sha1-dfFmQrSA8YenEcgUFh/TpKdlWJg=",
           "dev": true,
           "requires": {
-            "binary-extensions": "1.13.1"
+            "binary-extensions": "^1.0.0"
           }
         },
         "readdirp": {
@@ -8629,9 +8624,9 @@
           "integrity": "sha512-1JU/8q+VgFZyxwrJ+SVIOsh+KywWGpds3NTqikiKpDMZWScmAYyKIgqkO+ARvNWJfXeXR1zxz7aHF4u4CyH6vQ==",
           "dev": true,
           "requires": {
-            "graceful-fs": "4.2.0",
-            "micromatch": "3.1.10",
-            "readable-stream": "2.3.6"
+            "graceful-fs": "^4.1.11",
+            "micromatch": "^3.1.10",
+            "readable-stream": "^2.0.2"
           }
         },
         "to-regex-range": {
@@ -8640,8 +8635,8 @@
           "integrity": "sha1-fIDBe53+vlmeJzZ+DU3VWQFB2zg=",
           "dev": true,
           "requires": {
-            "is-number": "3.0.0",
-            "repeat-string": "1.6.1"
+            "is-number": "^3.0.0",
+            "repeat-string": "^1.6.1"
           }
         }
       }
@@ -8652,9 +8647,9 @@
       "integrity": "sha512-bpxWlvbbB459Mlipc5GBzzZwhoZgGEZLuqPaR0INBGnPAY1vdBX6hPnoFXiw+3yWxDuHyQjO2oXTMyS8A5haFg==",
       "dev": true,
       "requires": {
-        "http-parser-js": "0.4.10",
-        "safe-buffer": "5.2.0",
-        "websocket-extensions": "0.1.3"
+        "http-parser-js": ">=0.4.0 <0.4.11",
+        "safe-buffer": ">=5.1.0",
+        "websocket-extensions": ">=0.1.1"
       }
     },
     "websocket-extensions": {
@@ -8669,7 +8664,7 @@
       "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "wide-align": {
@@ -8679,7 +8674,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "string-width": "2.1.1"
+        "string-width": "^1.0.2 || 2"
       }
     },
     "wordwrap": {
@@ -8698,7 +8693,7 @@
       "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
       "dev": true,
       "requires": {
-        "mkdirp": "0.5.1"
+        "mkdirp": "^0.5.1"
       }
     },
     "ws": {
@@ -8706,9 +8701,9 @@
       "resolved": "https://registry.npmjs.org/ws/-/ws-3.3.3.tgz",
       "integrity": "sha512-nnWLa/NwZSt4KQJu51MYlCcSQ5g7INpOrOMt4XV8j4dqTXdmlUmSHQ8/oLC069ckre0fRsgfvsKwbTdtKLCDkA==",
       "requires": {
-        "async-limiter": "1.0.0",
-        "safe-buffer": "5.1.2",
-        "ultron": "1.1.1"
+        "async-limiter": "~1.0.0",
+        "safe-buffer": "~5.1.0",
+        "ultron": "~1.1.0"
       },
       "dependencies": {
         "safe-buffer": {
@@ -8747,7 +8742,7 @@
       "integrity": "sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=",
       "dev": true,
       "requires": {
-        "fd-slicer": "1.0.1"
+        "fd-slicer": "~1.0.1"
       }
     },
     "yeast": {
diff --git a/package.json b/package.json
index 35798806c..1a1006137 100644
--- a/package.json
+++ b/package.json
@@ -393,7 +393,6 @@
     "chokidar": "^3.0.0",
     "colors": "^1.1.0",
     "connect": "^3.6.0",
-    "core-js": "^3.1.3",
     "di": "^0.0.1",
     "dom-serialize": "^2.2.0",
     "flatted": "^2.0.0",
diff --git a/test/client/karma.spec.js b/test/client/karma.spec.js
index 76029acd1..3920fe3c0 100644
--- a/test/client/karma.spec.js
+++ b/test/client/karma.spec.js
@@ -1,5 +1,3 @@
-// shim all the things
-require('core-js/stable')
 var sinon = require('sinon')
 var assert = require('assert')