diff --git a/examples/angular/package.json b/examples/angular/package.json
index 722f52ffca..75f6740693 100644
--- a/examples/angular/package.json
+++ b/examples/angular/package.json
@@ -46,6 +46,13 @@
         "core-js": "2.6.9",
         "firebase-tools": "7.1.0",
         "history-server": "^1.3.1",
+        "karma": "~4.1.0",
+        "karma-chrome-launcher": "2.2.0",
+        "karma-firefox-launcher": "1.1.0",
+        "karma-jasmine": "2.0.1",
+        "karma-requirejs": "1.1.0",
+        "karma-sourcemap-loader": "0.3.7",
+        "requirejs": "2.3.6",
         "rollup": "^1.21.4",
         "rollup-plugin-commonjs": "^10.1.0",
         "rollup-plugin-node-resolve": "^5.2.0",
diff --git a/examples/angular_view_engine/package.json b/examples/angular_view_engine/package.json
index 249d7171e2..9e927ba594 100644
--- a/examples/angular_view_engine/package.json
+++ b/examples/angular_view_engine/package.json
@@ -46,7 +46,14 @@
         "core-js": "2.6.9",
         "firebase-tools": "7.1.0",
         "history-server": "^1.3.1",
+        "karma": "~4.1.0",
+        "karma-chrome-launcher": "2.2.0",
+        "karma-firefox-launcher": "1.1.0",
+        "karma-jasmine": "2.0.1",
+        "karma-requirejs": "1.1.0",
+        "karma-sourcemap-loader": "0.3.7",
         "patch-package": "^6.2.0",
+        "requirejs": "2.3.6",
         "rollup": "^1.21.4",
         "rollup-plugin-amd": "^4.0.0",
         "rollup-plugin-commonjs": "^10.1.0",
diff --git a/examples/protocol_buffers/package.json b/examples/protocol_buffers/package.json
index 6ca3e9374c..eecd3aad4b 100644
--- a/examples/protocol_buffers/package.json
+++ b/examples/protocol_buffers/package.json
@@ -11,8 +11,15 @@
     "@types/long": "^4.0.0",
     "@types/node": "11.11.1",
     "http-server": "^0.11.1",
+    "karma": "~4.1.0",
+    "karma-chrome-launcher": "2.2.0",
+    "karma-firefox-launcher": "1.1.0",
+    "karma-jasmine": "2.0.1",
+    "karma-requirejs": "1.1.0",
+    "karma-sourcemap-loader": "0.3.7",
     "long": "4.0.0",
     "protobufjs": "5.0.3",
+    "requirejs": "2.3.6",
     "rollup": "1.20.3",
     "terser": "4.3.1",
     "typescript": "^3.3.1"
diff --git a/examples/web_testing/BUILD.bazel b/examples/web_testing/BUILD.bazel
index 57c9ab0d4c..8ffb8fc59f 100644
--- a/examples/web_testing/BUILD.bazel
+++ b/examples/web_testing/BUILD.bazel
@@ -73,23 +73,6 @@ karma_web_test_suite(
     ],
 )
 
-karma_web_test_suite(
-    name = "sauce_test",
-    browsers = [
-        "@io_bazel_rules_webtesting//browsers/sauce:chrome-win10",
-    ],
-    tags = [
-        "exclusive",
-        "native",
-        "sauce",
-        # TODO(alexeagle): enable on CI once we have set the SAUCE env variables
-        "manual",
-    ],
-    deps = [
-        ":tests",
-    ],
-)
-
 # Just a dummy test so that we have a test target for //... on certain bazelci platforms with bazel_integration_test
 sh_test(
     name = "dummy_test",
diff --git a/examples/web_testing/package.json b/examples/web_testing/package.json
index 6b4423c3c8..b257bbe364 100644
--- a/examples/web_testing/package.json
+++ b/examples/web_testing/package.json
@@ -4,7 +4,14 @@
     "@bazel/typescript": "^0.40.0",
     "@types/jasmine": "2.8.2",
     "@types/node": "11.11.1",
+    "karma": "~4.1.0",
+    "karma-chrome-launcher": "2.2.0",
+    "karma-firefox-launcher": "1.1.0",
+    "karma-jasmine": "2.0.1",
     "karma-json-result-reporter": "1.0.0",
+    "karma-requirejs": "1.1.0",
+    "karma-sourcemap-loader": "0.3.7",
+    "requirejs": "2.3.6",
     "typescript": "^3.3.1"
   },
   "scripts": {
diff --git a/package.json b/package.json
index 10ec4abe97..dcb93658ec 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,6 @@
         "karma-firefox-launcher": "1.1.0",
         "karma-jasmine": "2.0.1",
         "karma-requirejs": "1.1.0",
-        "karma-sauce-launcher": "2.0.2",
         "karma-sourcemap-loader": "0.3.7",
         "minimist": "^1.2.0",
         "node_resolve_index": "file:./tools/npm_packages/node_resolve_index",
diff --git a/packages/karma/src/BUILD.bazel b/packages/karma/src/BUILD.bazel
index 1c2b93547f..0d9fb9e0e3 100644
--- a/packages/karma/src/BUILD.bazel
+++ b/packages/karma/src/BUILD.bazel
@@ -17,7 +17,6 @@
 # The generated `@bazel/karma` npm package contains a trimmed BUILD file using INTERNAL fences.
 load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
 load("@build_bazel_rules_nodejs//:index.bzl", "nodejs_binary")
-load("@build_bazel_rules_nodejs//internal/js_library:js_library.bzl", "js_library")
 load("@npm_bazel_typescript//:index.from_src.bzl", "ts_library")
 
 package(default_visibility = ["//visibility:public"])
@@ -43,7 +42,6 @@ nodejs_binary(
         "@npm//karma-firefox-launcher",
         "@npm//karma-jasmine",
         "@npm//karma-requirejs",
-        "@npm//karma-sauce-launcher",
         "@npm//karma-sourcemap-loader",
         "@npm//requirejs",
         "@npm//tmp",
@@ -71,23 +69,12 @@ filegroup(
         "browser_repositories.bzl",
         "index.bzl",
         "karma.conf.js",
-        "karma.js",
         "karma_web_test.bzl",
         "package.bzl",
         "package.json",
-        "plugins.js",
     ],
 )
 
-js_library(
-    name = "karma_plugins",
-    srcs = [
-        "plugins.js",
-    ],
-    module_name = "@bazel/karma/plugins",
-    module_root = "plugins.js",
-)
-
 # END-INTERNAL
 exports_files([
     "karma.conf.js",
diff --git a/packages/karma/src/index.from_src.bzl b/packages/karma/src/index.from_src.bzl
index d6cf7d9f7e..f54886a687 100644
--- a/packages/karma/src/index.from_src.bzl
+++ b/packages/karma/src/index.from_src.bzl
@@ -21,12 +21,21 @@ load(
     _karma_web_test_suite = "karma_web_test_suite",
 )
 
-INTERNAL_KARMA_BIN = "@npm_bazel_karma//:karma_bin"
+_KARMA_BIN = "@npm_bazel_karma//:karma_bin"
+_KARMA_PEER_DEPS = [
+    "@npm//jasmine-core",
+    "@npm//karma",
+    "@npm//karma-chrome-launcher",
+    "@npm//karma-firefox-launcher",
+    "@npm//karma-jasmine",
+    "@npm//karma-requirejs",
+    "@npm//karma-sourcemap-loader",
+    "@npm//requirejs",
+    "@npm//tmp",
+]
 
-def karma_web_test(karma = INTERNAL_KARMA_BIN, **kwargs):
-    data = kwargs.pop("data", []) + ["@npm_bazel_karma//:karma_plugins"]
-    _karma_web_test(karma = karma, data = data, **kwargs)
+def karma_web_test(karma = _KARMA_BIN, **kwargs):
+    _karma_web_test(karma = karma, peer_deps = _KARMA_PEER_DEPS, **kwargs)
 
-def karma_web_test_suite(karma = INTERNAL_KARMA_BIN, **kwargs):
-    data = kwargs.pop("data", []) + ["@npm_bazel_karma//:karma_plugins"]
-    _karma_web_test_suite(karma = karma, data = data, **kwargs)
+def karma_web_test_suite(karma = _KARMA_BIN, **kwargs):
+    _karma_web_test_suite(karma = karma, peer_deps = _KARMA_PEER_DEPS, **kwargs)
diff --git a/packages/karma/src/karma.conf.js b/packages/karma/src/karma.conf.js
index 3a36042189..cb3f631335 100644
--- a/packages/karma/src/karma.conf.js
+++ b/packages/karma/src/karma.conf.js
@@ -142,12 +142,15 @@ try {
   function configureBazelConfig(config, conf) {
     // list of karma plugins
     mergeConfigArray(conf, 'plugins', [
-      // Loads 'concat_js', 'watcher', 'jasmine', 'requirejs' and 'sourcemap'
-      // from @bazel/karma. These packages are used in this config file.
-      ...require('@bazel/karma/plugins'),
+      // Loads 'concat_js'
+      require('@bazel/karma'),
+      // Load plugins that are peer deps. These packages are used in this config file.
+      require('karma-chrome-launcher'),
+      require('karma-firefox-launcher'),
+      require('karma-jasmine'),
+      require('karma-requirejs'),
+      require('karma-sourcemap-loader'),
       // Loads user-installed karma-* packages in the root node_modules.
-      // If some of the plugins above are also installed in user project, the
-      // user version would override the default.
       'karma-*',
     ]);
 
@@ -307,29 +310,7 @@ try {
 
     const webTestMetadata = require(process.env['WEB_TEST_METADATA']);
     log_verbose(`WEB_TEST_METADATA: ${JSON.stringify(webTestMetadata, null, 2)}`);
-    if (webTestMetadata['environment'] === 'sauce') {
-      // If a sauce labs browser is chosen for the test such as
-      // "@io_bazel_rules_webtesting//browsers/sauce:chrome-win10"
-      // than the 'environment' will equal 'sauce'.
-      // We expect that a SAUCE_USERNAME and SAUCE_ACCESS_KEY is available
-      // from the environment for this test to run
-      if (!process.env.SAUCE_USERNAME || !process.env.SAUCE_ACCESS_KEY) {
-        console.error(
-            'Make sure the SAUCE_USERNAME and SAUCE_ACCESS_KEY environment variables are set.');
-        process.exit(1);
-      }
-      // 'capabilities' will specify the sauce labs configuration to use
-      const capabilities = webTestMetadata['capabilities'];
-      conf.customLaunchers = {
-        'sauce': {
-          base: 'SauceLabs',
-          browserName: capabilities['browserName'],
-          platform: capabilities['platform'],
-          version: capabilities['version'],
-        }
-      };
-      conf.browsers.push('sauce');
-    } else if (webTestMetadata['environment'] === 'local') {
+    if (webTestMetadata['environment'] === 'local') {
       // When a local chrome or firefox browser is chosen such as
       // "@io_bazel_rules_webtesting//browsers:chromium-local" or
       // "@io_bazel_rules_webtesting//browsers:firefox-local"
@@ -376,26 +357,6 @@ try {
     if (!conf.browsers.length) {
       throw new Error('No browsers configured in web test suite');
     }
-
-    // Extra configuration is needed for saucelabs
-    // See: https://github.com/karma-runner/karma-sauce-launcher
-    if (conf.customLaunchers) {
-      // set the test name for sauce labs to use
-      // TEST_BINARY is set by Bazel and contains the name of the test
-      // target postfixed with the browser name such as
-      // 'examples/testing/testing_sauce_chrome-win10' for the
-      // test target examples/testing:testing
-      if (!conf.sauceLabs) {
-        conf.sauceLabs = {}
-      }
-      conf.sauceLabs.testName = process.env['TEST_BINARY'] || 'karma';
-
-      // Try "websocket" for a faster transmission first. Fallback to "polling" if necessary.
-      overrideConfigValue(conf, 'transports', ['websocket', 'polling']);
-
-      // add the saucelabs reporter
-      mergeConfigArray(conf, 'reporters', ['saucelabs']);
-    }
   }
 
   function configureTsWebTestConfig(conf) {
diff --git a/packages/karma/src/karma.js b/packages/karma/src/karma.js
deleted file mode 100644
index 2653ede140..0000000000
--- a/packages/karma/src/karma.js
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/usr/bin/env node
-
-require('karma/lib/cli').run();
diff --git a/packages/karma/src/karma_web_test.bzl b/packages/karma/src/karma_web_test.bzl
index b481e64a6d..58198a559c 100644
--- a/packages/karma/src/karma_web_test.bzl
+++ b/packages/karma/src/karma_web_test.bzl
@@ -18,8 +18,18 @@ load("@build_bazel_rules_nodejs//internal/js_library:js_library.bzl", "write_amd
 load("@io_bazel_rules_webtesting//web:web.bzl", "web_test_suite")
 load("@io_bazel_rules_webtesting//web/internal:constants.bzl", "DEFAULT_WRAPPED_TEST_TAGS")
 
-_CONF_TMPL = "//:karma.conf.js"
-_DEFAULT_KARMA_BIN = "@npm//@bazel/karma/bin:karma"
+KARMA_PEER_DEPS = [
+    "@npm//@bazel/karma",
+    "@npm//jasmine-core",
+    "@npm//karma",
+    "@npm//karma-chrome-launcher",
+    "@npm//karma-firefox-launcher",
+    "@npm//karma-jasmine",
+    "@npm//karma-requirejs",
+    "@npm//karma-sourcemap-loader",
+    "@npm//requirejs",
+    "@npm//tmp",
+]
 
 KARMA_WEB_TEST_ATTRS = {
     "srcs": attr.label_list(
@@ -51,7 +61,7 @@ KARMA_WEB_TEST_ATTRS = {
     ),
     "karma": attr.label(
         doc = "karma binary label",
-        default = Label(_DEFAULT_KARMA_BIN),
+        default = "@npm//karma/bin:karma",
         executable = True,
         cfg = "target",
         allow_files = True,
@@ -76,7 +86,7 @@ KARMA_WEB_TEST_ATTRS = {
         aspects = [node_modules_aspect],
     ),
     "_conf_tmpl": attr.label(
-        default = Label(_CONF_TMPL),
+        default = "//:karma.conf.js",
         allow_single_file = True,
     ),
 }
@@ -313,6 +323,7 @@ def karma_web_test(
         static_files = [],
         config_file = None,
         tags = [],
+        peer_deps = KARMA_PEER_DEPS,
         **kwargs):
     """Runs unit tests in a browser with Karma.
 
@@ -357,12 +368,13 @@ def karma_web_test(
           certain attributes of this configuration file. Attributes that are
           overridden will be outputted to the test log.
       tags: Standard Bazel tags, this macro adds tags for ibazel support
+      peer_deps: list of peer npm deps required by karma_web_test
       **kwargs: Passed through to `karma_web_test`
     """
 
     _karma_web_test(
         srcs = srcs,
-        deps = deps,
+        deps = deps + peer_deps,
         data = data,
         configuration_env_vars = configuration_env_vars,
         bootstrap = bootstrap,
@@ -379,98 +391,81 @@ def karma_web_test(
 def karma_web_test_suite(
         name,
         browsers = None,
-        args = None,
-        browser_overrides = None,
-        config = None,
-        flaky = None,
-        local = None,
-        shard_count = None,
-        size = None,
-        tags = [],
-        test_suite_tags = None,
-        timeout = None,
-        visibility = None,
         web_test_data = [],
-        wrapped_test_tags = None,
-        **remaining_keyword_args):
+        wrapped_test_tags = list(DEFAULT_WRAPPED_TEST_TAGS),
+        **kwargs):
     """Defines a test_suite of web_test targets that wrap a karma_web_test target.
 
-    This macro also accepts all parameters in karma_web_test. See karma_web_test docs
-    for details.
+    This macro accepts all parameters in karma_web_test and adds additional parameters
+    for the suite. See karma_web_test docs for all karma_web_test.
+
+    The wrapping macro is `web_test_suite` which comes from rules_websting:
+    https://github.com/bazelbuild/rules_webtesting/blob/master/web/web.bzl.
 
     Args:
       name: The base name of the test
       browsers: A sequence of labels specifying the browsers to use.
-      args: Args for web_test targets generated by this extension.
-      browser_overrides: Dictionary; optional; default is an empty dictionary. A
-        dictionary mapping from browser names to browser-specific web_test
-        attributes, such as shard_count, flakiness, timeout, etc. For example:
-        ```
-        {
-            '//browsers:chrome-native': {'shard_count': 3, 'flaky': 1},
-            '//browsers:firefox-native': {'shard_count': 1, 'timeout': 100},
-        }
-        ```
-      config: Label; optional; Configuration of web test features.
-      flaky: A boolean specifying that the test is flaky. If set, the test will
-        be retried up to 3 times (default: 0)
-      local: boolean; optional.
-      shard_count: The number of test shards to use per browser. (default: 1)
-      size: A string specifying the test size. (default: 'large')
-      tags: A list of test tag strings to apply to each generated web_test target.
-        This macro adds a couple for ibazel.
-      test_suite_tags: A list of tag strings for the generated test_suite.
-      timeout: A string specifying the test timeout (default: computed from size)
-      visibility: List of labels; optional.
-      web_test_data: Data dependencies for the web_test.
-      wrapped_test_tags: A list of test tag strings to use for the wrapped test
-      **remaining_keyword_args: Arguments for the wrapped test target.
+      web_test_data: Data dependencies for the wrapoer web_test targets.
+      wrapped_test_tags: A list of test tag strings to use for the wrapped
+        karma_web_test target.
+      **kwargs: Arguments for the wrapped karma_web_test target.
     """
 
-    # Check explicitly for None so that users can set this to the empty list
-    if wrapped_test_tags == None:
-        wrapped_test_tags = DEFAULT_WRAPPED_TEST_TAGS
-
+    # Common attributes
+    args = kwargs.pop("args", None)
+    flaky = kwargs.pop("flaky", None)
+    local = kwargs.pop("local", None)
+    shard_count = kwargs.pop("shard_count", None)
+    size = kwargs.pop("size", "large")
+    timeout = kwargs.pop("timeout", None)
+
+    # Wrapper attributes
+    browser_overrides = kwargs.pop("browser_overrides", None)
+    config = kwargs.pop("config", None)
+    test_suite_tags = kwargs.pop("test_suite_tags", None)
+    visibility = kwargs.pop("visibility", None)
+    tags = kwargs.pop("tags", []) + [
+        # Users don't need to know that this tag is required to run under ibazel
+        "ibazel_notify_changes",
+    ]
     if browsers == None:
         browsers = ["@io_bazel_rules_webtesting//browsers:chromium-local"]
+
+        # rules_webesting requires the "native" tag for browsers
         if not "native" in tags:
             tags = tags + ["native"]
 
-    size = size or "large"
-
+    # The wrapped `karma_web_test` target
     wrapped_test_name = name + "_wrapped_test"
-
-    _karma_web_test(
+    karma_web_test(
         name = wrapped_test_name,
         args = args,
         flaky = flaky,
         local = local,
         shard_count = shard_count,
         size = size,
-        tags = wrapped_test_tags,
         timeout = timeout,
+        tags = wrapped_test_tags,
         visibility = ["//visibility:private"],
-        **remaining_keyword_args
+        **kwargs
     )
 
+    # The wrapper `web_test_suite` target
     web_test_suite(
         name = name,
-        launcher = ":" + wrapped_test_name,
         args = args,
-        browsers = browsers,
-        browser_overrides = browser_overrides,
-        config = config,
-        data = web_test_data,
         flaky = flaky,
         local = local,
         shard_count = shard_count,
         size = size,
-        tags = tags + [
-            # Users don't need to know that this tag is required to run under ibazel
-            "ibazel_notify_changes",
-        ],
+        timeout = timeout,
+        launcher = ":" + wrapped_test_name,
+        browsers = browsers,
+        browser_overrides = browser_overrides,
+        config = config,
+        data = web_test_data,
+        tags = tags,
         test = wrapped_test_name,
         test_suite_tags = test_suite_tags,
-        timeout = timeout,
         visibility = visibility,
     )
diff --git a/packages/karma/src/package.json b/packages/karma/src/package.json
index 1c0b0eab4f..81f9eee887 100644
--- a/packages/karma/src/package.json
+++ b/packages/karma/src/package.json
@@ -17,21 +17,17 @@
   ],
   "main": "./index.js",
   "typings": "./index.d.ts",
-  "bin": {
-    "karma": "./karma.js"
-  },
   "dependencies": {
-    "jasmine-core": "2.8.0",
-    "karma": "~4.1.0",
-    "karma-chrome-launcher": "2.2.0",
-    "karma-firefox-launcher": "1.1.0",
-    "karma-jasmine": "2.0.1",
-    "karma-requirejs": "1.1.0",
-    "karma-sauce-launcher": "2.0.2",
-    "karma-sourcemap-loader": "0.3.7",
-    "requirejs": "2.3.5",
-    "semver": "5.6.0",
-    "tmp": "0.0.33"
+    "tmp": "0.1.0"
+  },
+  "peerDependencies": {
+    "jasmine-core": ">=2.0.0",
+    "karma": ">=4.0.0",
+    "karma-chrome-launcher": ">=2.0.0",
+    "karma-firefox-launcher": ">=1.0.0",
+    "karma-jasmine": ">=2.0.0",
+    "karma-requirejs": ">=1.0.0",
+    "karma-sourcemap-loader": ">=0.3.0"
   },
   "bazelWorkspaces": {
     "npm_bazel_karma": {
diff --git a/packages/karma/src/plugins.js b/packages/karma/src/plugins.js
deleted file mode 100644
index 1b99aa4c67..0000000000
--- a/packages/karma/src/plugins.js
+++ /dev/null
@@ -1,13 +0,0 @@
-// This file reexports dependencies of @bazel/karma so that the
-// Bazel-generated Karma config could load the actual versions specified in
-// this package.
-
-module.exports = [
-  require('./index'),
-  require('karma-chrome-launcher'),
-  require('karma-firefox-launcher'),
-  require('karma-jasmine'),
-  require('karma-requirejs'),
-  require('karma-sauce-launcher'),
-  require('karma-sourcemap-loader'),
-];
diff --git a/packages/karma/test/defaults.bzl b/packages/karma/test/defaults.bzl
index 1a179c2eaf..6a19513db1 100644
--- a/packages/karma/test/defaults.bzl
+++ b/packages/karma/test/defaults.bzl
@@ -17,7 +17,7 @@
 
 load("@npm_bazel_karma//:index.from_src.bzl", _karma_web_test_suite = "karma_web_test_suite")
 
-def karma_web_test_suite(name, browsers = [], tags = [], **kwargs):
+def karma_web_test_suite(name, browsers = None, tags = [], **kwargs):
     # BazelCI docker images are missing shares libs to run a subset browser tests:
     # mac: firefox does not work, chrome works
     # ubuntu: firefox and chrome do not work --- there are 0 tests to run
diff --git a/packages/protractor/src/protractor.conf.js b/packages/protractor/src/protractor.conf.js
index 81dd2254d8..6726f5610c 100644
--- a/packages/protractor/src/protractor.conf.js
+++ b/packages/protractor/src/protractor.conf.js
@@ -114,26 +114,7 @@ setConf(conf, 'specs', specs, 'are determined by the srcs and deps attribute');
 if (process.env['WEB_TEST_METADATA']) {
   const webTestMetadata = require(process.env['WEB_TEST_METADATA']);
   log_verbose(`WEB_TEST_METADATA: ${JSON.stringify(webTestMetadata, null, 2)}`);
-  if (webTestMetadata['environment'] === 'sauce') {
-    // If a sauce labs browser is chosen for the test such as
-    // "@io_bazel_rules_webtesting//browsers/sauce:chrome-win10"
-    // than the 'environment' will equal 'sauce'.
-    // We expect that a SAUCE_USERNAME and SAUCE_ACCESS_KEY is available
-    // from the environment for this test to run
-
-    // TODO(gmagolan): implement sauce labs support for protractor
-    throw new Error('Saucelabs not yet support by protractor_web_test_suite.');
-
-    // if (!process.env.SAUCE_USERNAME || !process.env.SAUCE_ACCESS_KEY) {
-    //   console.error('Make sure the SAUCE_USERNAME and SAUCE_ACCESS_KEY environment variables are
-    //   set.');
-    //   process.exit(1);
-    // }
-    // setConf(conf, 'sauceUser', process.env.SAUCE_USERNAME, 'is determined by the SAUCE_USERNAME
-    // environment variable');
-    // setConf(conf, 'sauceKey', process.env.SAUCE_ACCESS_KEY, 'is determined by the
-    // SAUCE_ACCESS_KEY environment variable');
-  } else if (webTestMetadata['environment'] === 'local') {
+  if (webTestMetadata['environment'] === 'local') {
     // When a local chrome or firefox browser is chosen such as
     // "@io_bazel_rules_webtesting//browsers:chromium-local" or
     // "@io_bazel_rules_webtesting//browsers:firefox-local"
diff --git a/yarn.lock b/yarn.lock
index 4be5ffa071..18d68331de 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1287,7 +1287,7 @@ add-stream@^1.0.0:
   resolved "https://registry.yarnpkg.com/add-stream/-/add-stream-1.0.0.tgz#6a7990437ca736d5e1288db92bd3266d5f5cb2aa"
   integrity sha1-anmQQ3ynNtXhKI25K9MmbV9csqo=
 
-adm-zip@^0.4.9, adm-zip@~0.4.3:
+adm-zip@^0.4.9:
   version "0.4.13"
   resolved "https://registry.yarnpkg.com/adm-zip/-/adm-zip-0.4.13.tgz#597e2f8cc3672151e1307d3e95cddbc75672314a"
   integrity sha512-fERNJX8sOXfel6qCBCMPvZLzENBEhZTzKqg6vrOW5pvoEaQuJhRU4ndTAh6lHOxn1I6jnz2NHra56ZODM751uw==
@@ -1505,7 +1505,7 @@ async@^1.5.2:
   resolved "https://registry.yarnpkg.com/async/-/async-1.5.2.tgz#ec6a61ae56480c0c3cb241c95618e20892f9672a"
   integrity sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=
 
-async@^2.1.2, async@^2.6.2:
+async@^2.6.2:
   version "2.6.3"
   resolved "https://registry.yarnpkg.com/async/-/async-2.6.3.tgz#d72625e2344a3656e3a3ad4fa749fa83299d82ff"
   integrity sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==
@@ -2626,7 +2626,7 @@ deep-is@~0.1.3:
   resolved "https://registry.yarnpkg.com/deep-is/-/deep-is-0.1.3.tgz#b369d6fb5dbc13eecf524f91b070feedc357cf34"
   integrity sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=
 
-define-properties@^1.1.2, define-properties@^1.1.3:
+define-properties@^1.1.2:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/define-properties/-/define-properties-1.1.3.tgz#cf88da6cbee26fe6db7094f61d870cbd84cee9f1"
   integrity sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==
@@ -2900,31 +2900,6 @@ error-ex@^1.2.0, error-ex@^1.3.1:
   dependencies:
     is-arrayish "^0.2.1"
 
-es-abstract@^1.5.1:
-  version "1.15.0"
-  resolved "https://registry.yarnpkg.com/es-abstract/-/es-abstract-1.15.0.tgz#8884928ec7e40a79e3c9bc812d37d10c8b24cc57"
-  integrity sha512-bhkEqWJ2t2lMeaJDuk7okMkJWI/yqgH/EoGwpcvv0XW9RWQsRspI4wt6xuyuvMvvQE3gg/D9HXppgk21w78GyQ==
-  dependencies:
-    es-to-primitive "^1.2.0"
-    function-bind "^1.1.1"
-    has "^1.0.3"
-    has-symbols "^1.0.0"
-    is-callable "^1.1.4"
-    is-regex "^1.0.4"
-    object-inspect "^1.6.0"
-    object-keys "^1.1.1"
-    string.prototype.trimleft "^2.1.0"
-    string.prototype.trimright "^2.1.0"
-
-es-to-primitive@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/es-to-primitive/-/es-to-primitive-1.2.0.tgz#edf72478033456e8dda8ef09e00ad9650707f377"
-  integrity sha512-qZryBOJjV//LaxLTV6UC//WewneB3LcXOL9NP++ozKVXsIIIpm/2c13UDiD9Jp2eThsecw9m3jPqDwTyobcdbg==
-  dependencies:
-    is-callable "^1.1.4"
-    is-date-object "^1.0.1"
-    is-symbol "^1.0.2"
-
 es6-promise@^4.0.3:
   version "4.2.8"
   resolved "https://registry.yarnpkg.com/es6-promise/-/es6-promise-4.2.8.tgz#4eb21594c972bc40553d276e510539143db53e0a"
@@ -3651,13 +3626,6 @@ has-values@^1.0.0:
     is-number "^3.0.0"
     kind-of "^4.0.0"
 
-has@^1.0.1, has@^1.0.3:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/has/-/has-1.0.3.tgz#722d7cbfc1f6aa8241f16dd814e011e1f41e8796"
-  integrity sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==
-  dependencies:
-    function-bind "^1.1.1"
-
 hash-base@^3.0.0:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/hash-base/-/hash-base-3.0.4.tgz#5fc8686847ecd73499403319a6b0a3f3f6ae4918"
@@ -3953,11 +3921,6 @@ is-builtin-module@3.0.0:
   dependencies:
     builtin-modules "^3.0.0"
 
-is-callable@^1.1.4:
-  version "1.1.4"
-  resolved "https://registry.yarnpkg.com/is-callable/-/is-callable-1.1.4.tgz#1e1adf219e1eeb684d691f9d6a05ff0d30a24d75"
-  integrity sha512-r5p9sxJjYnArLjObpjA4xu5EKI3CuKHkJXMhT7kwbpUyIFD1n5PMAsoPvWnvtZiNz7LjkYDRZhd7FlI0eMijEA==
-
 is-ci@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/is-ci/-/is-ci-2.0.0.tgz#6bc6334181810e04b5c22b3d589fdca55026404c"
@@ -3979,11 +3942,6 @@ is-data-descriptor@^1.0.0:
   dependencies:
     kind-of "^6.0.0"
 
-is-date-object@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/is-date-object/-/is-date-object-1.0.1.tgz#9aa20eb6aeebbff77fbd33e74ca01b33581d3a16"
-  integrity sha1-mqIOtq7rv/d/vTPnTKAbM1gdOhY=
-
 is-descriptor@^0.1.0:
   version "0.1.6"
   resolved "https://registry.yarnpkg.com/is-descriptor/-/is-descriptor-0.1.6.tgz#366d8240dde487ca51823b1ab9f07a10a78251ca"
@@ -4105,25 +4063,11 @@ is-plain-object@^2.0.3, is-plain-object@^2.0.4:
   dependencies:
     isobject "^3.0.1"
 
-is-regex@^1.0.4:
-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/is-regex/-/is-regex-1.0.4.tgz#5517489b547091b0930e095654ced25ee97e9491"
-  integrity sha1-VRdIm1RwkbCTDglWVM7SXul+lJE=
-  dependencies:
-    has "^1.0.1"
-
 is-stream@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/is-stream/-/is-stream-1.1.0.tgz#12d4a3dd4e68e0b79ceb8dbc84173ae80d91ca44"
   integrity sha1-EtSj3U5o4Lec6428hBc66A2RykQ=
 
-is-symbol@^1.0.2:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/is-symbol/-/is-symbol-1.0.2.tgz#a055f6ae57192caee329e7a860118b497a950f38"
-  integrity sha512-HS8bZ9ox60yCJLH9snBpIwv9pYUAkcuLhSA1oero1UB5y9aiQpRA8y2ex945AOtCZL1lJDeIk3G5LthswI46Lw==
-  dependencies:
-    has-symbols "^1.0.0"
-
 is-text-path@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/is-text-path/-/is-text-path-1.0.1.tgz#4e1aa0fb51bfbcb3e92688001397202c1775b66e"
@@ -4350,7 +4294,7 @@ jsprim@^1.2.2:
     json-schema "0.2.3"
     verror "1.10.0"
 
-jszip@^3.1.3, jszip@^3.1.5:
+jszip@^3.1.3:
   version "3.2.2"
   resolved "https://registry.yarnpkg.com/jszip/-/jszip-3.2.2.tgz#b143816df7e106a9597a94c77493385adca5bd1d"
   integrity sha512-NmKajvAFQpbg3taXQXr/ccS2wcucR1AZ+NtyWp2Nq7HHVsXhcJFR8p0Baf32C2yVvBylFWVeKf+WI2AnvlPhpA==
@@ -4390,15 +4334,6 @@ karma-requirejs@1.1.0:
   resolved "https://registry.yarnpkg.com/karma-requirejs/-/karma-requirejs-1.1.0.tgz#fddae2cb87d7ebc16fb0222893564d7fee578798"
   integrity sha1-/driy4fX68FvsCIok1ZNf+5Xh5g=
 
-karma-sauce-launcher@2.0.2:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/karma-sauce-launcher/-/karma-sauce-launcher-2.0.2.tgz#dbf98e70d86bf287b03a537cf637eb7aefa975c3"
-  integrity sha512-jLUFaJhHMcKpxFWUesyWYihzM5FvQiJsDwGcCtKeOy2lsWhkVw0V0Byqb1d+wU6myU1mribBtsIcub23HS4kWA==
-  dependencies:
-    sauce-connect-launcher "^1.2.4"
-    saucelabs "^1.5.0"
-    selenium-webdriver "^4.0.0-alpha.1"
-
 karma-sourcemap-loader@0.3.7:
   version "0.3.7"
   resolved "https://registry.yarnpkg.com/karma-sourcemap-loader/-/karma-sourcemap-loader-0.3.7.tgz#91322c77f8f13d46fed062b042e1009d4c4505d8"
@@ -4573,7 +4508,7 @@ lodash@4.17.14:
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.14.tgz#9ce487ae66c96254fe20b599f21b6816028078ba"
   integrity sha512-mmKYbW3GLuJeX+iGP+Y7Gp1AiGHGbXHCOh/jZmrawMmsE7MS4znI3RL2FsjbqOyMayHInjOeykW7PEajUk1/xw==
 
-lodash@^4.14.14, lodash@^4.16.6, lodash@^4.17.11, lodash@^4.17.13, lodash@^4.17.14, lodash@^4.2.1:
+lodash@^4.14.14, lodash@^4.17.11, lodash@^4.17.13, lodash@^4.17.14, lodash@^4.2.1:
   version "4.17.15"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
   integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
@@ -5161,12 +5096,7 @@ object-copy@^0.1.0:
     define-property "^0.2.5"
     kind-of "^3.0.3"
 
-object-inspect@^1.6.0:
-  version "1.6.0"
-  resolved "https://registry.yarnpkg.com/object-inspect/-/object-inspect-1.6.0.tgz#c70b6cbf72f274aab4c34c0c82f5167bf82cf15b"
-  integrity sha512-GJzfBZ6DgDAmnuaM3104jR4s1Myxr3Y3zfIyN4z3UdqN69oSRacNK8UhnobDdC+7J2AHCjGwxQubNJfE70SXXQ==
-
-object-keys@^1.0.11, object-keys@^1.0.12, object-keys@^1.1.1:
+object-keys@^1.0.11, object-keys@^1.0.12:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/object-keys/-/object-keys-1.1.1.tgz#1c47f272df277f3b1daf061677d9c82e2322c60e"
   integrity sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA==
@@ -5188,14 +5118,6 @@ object.assign@^4.1.0:
     has-symbols "^1.0.0"
     object-keys "^1.0.11"
 
-object.getownpropertydescriptors@^2.0.3:
-  version "2.0.3"
-  resolved "https://registry.yarnpkg.com/object.getownpropertydescriptors/-/object.getownpropertydescriptors-2.0.3.tgz#8758c846f5b407adab0f236e0986f14b051caa16"
-  integrity sha1-h1jIRvW0B62rDyNuCYbxSwUcqhY=
-  dependencies:
-    define-properties "^1.1.2"
-    es-abstract "^1.5.1"
-
 object.pick@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/object.pick/-/object.pick-1.3.0.tgz#87a10ac4c1694bd2e1cbf53591a66141fb5dd747"
@@ -6199,17 +6121,6 @@ safe-regex@^1.1.0:
   resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
   integrity sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==
 
-sauce-connect-launcher@^1.2.4:
-  version "1.2.7"
-  resolved "https://registry.yarnpkg.com/sauce-connect-launcher/-/sauce-connect-launcher-1.2.7.tgz#c7f8b3d4eb354d07a9922b4cd67356f527192556"
-  integrity sha512-v07+QhFrxgz3seMFuRSonu3gW1s6DbcLQlFhjsRrmKUauzPbbudHdnn91WYgEwhoZVdPNzeZpAEJwcQyd9xnTA==
-  dependencies:
-    adm-zip "~0.4.3"
-    async "^2.1.2"
-    https-proxy-agent "^2.2.1"
-    lodash "^4.16.6"
-    rimraf "^2.5.4"
-
 saucelabs@^1.5.0:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/saucelabs/-/saucelabs-1.5.0.tgz#9405a73c360d449b232839919a86c396d379fd9d"
@@ -6241,16 +6152,6 @@ selenium-webdriver@3.6.0, selenium-webdriver@^3.0.1:
     tmp "0.0.30"
     xml2js "^0.4.17"
 
-selenium-webdriver@^4.0.0-alpha.1:
-  version "4.0.0-alpha.5"
-  resolved "https://registry.yarnpkg.com/selenium-webdriver/-/selenium-webdriver-4.0.0-alpha.5.tgz#e4683b3dbf827d70df09a7e43bf02ebad20fa7c1"
-  integrity sha512-hktl3DSrhzM59yLhWzDGHIX9o56DvA+cVK7Dw6FcJR6qQ4CGzkaHeXQPcdrslkWMTeq0Ci9AmCxq0EMOvm2Rkg==
-  dependencies:
-    jszip "^3.1.5"
-    rimraf "^2.6.3"
-    tmp "0.0.30"
-    xml2js "^0.4.19"
-
 semver-compare@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/semver-compare/-/semver-compare-1.0.0.tgz#0dee216a1c941ab37e9efb1788f6afc5ff5537fc"
@@ -6700,22 +6601,6 @@ string-width@^3.0.0, string-width@^3.1.0:
     is-fullwidth-code-point "^2.0.0"
     strip-ansi "^5.1.0"
 
-string.prototype.trimleft@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/string.prototype.trimleft/-/string.prototype.trimleft-2.1.0.tgz#6cc47f0d7eb8d62b0f3701611715a3954591d634"
-  integrity sha512-FJ6b7EgdKxxbDxc79cOlok6Afd++TTs5szo+zJTUyow3ycrRfJVE2pq3vcN53XexvKZu/DJMDfeI/qMiZTrjTw==
-  dependencies:
-    define-properties "^1.1.3"
-    function-bind "^1.1.1"
-
-string.prototype.trimright@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/string.prototype.trimright/-/string.prototype.trimright-2.1.0.tgz#669d164be9df9b6f7559fa8e89945b168a5a6c58"
-  integrity sha512-fXZTSV55dNBwv16uw+hh5jkghxSnc5oHq+5K/gXgizHwAvMetdAJlHqqoFC1FSDVPYWLkAKl2cxpUT41sV7nSg==
-  dependencies:
-    define-properties "^1.1.3"
-    function-bind "^1.1.1"
-
 string_decoder@^1.0.0, string_decoder@^1.1.1:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-1.3.0.tgz#42f114594a46cf1a8e30b0a84f56c78c3edac21e"
@@ -7252,14 +7137,6 @@ util-deprecate@^1.0.1, util-deprecate@~1.0.1:
   resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
   integrity sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=
 
-util.promisify@~1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/util.promisify/-/util.promisify-1.0.0.tgz#440f7165a459c9a16dc145eb8e72f35687097030"
-  integrity sha512-i+6qA2MPhvoKLuxnJNpXAGhg7HphQOSUq2LKMZD0m15EiskXUkMvKdF4Uui0WYeCUGea+o2cw/ZuwehtfsrNkA==
-  dependencies:
-    define-properties "^1.1.2"
-    object.getownpropertydescriptors "^2.0.3"
-
 util@0.10.3:
   version "0.10.3"
   resolved "https://registry.yarnpkg.com/util/-/util-0.10.3.tgz#7afb1afe50805246489e3db7fe0ed379336ac0f9"
@@ -7491,20 +7368,6 @@ xml2js@^0.4.17:
     sax ">=0.6.0"
     xmlbuilder "~9.0.1"
 
-xml2js@^0.4.19:
-  version "0.4.22"
-  resolved "https://registry.yarnpkg.com/xml2js/-/xml2js-0.4.22.tgz#4fa2d846ec803237de86f30aa9b5f70b6600de02"
-  integrity sha512-MWTbxAQqclRSTnehWWe5nMKzI3VmJ8ltiJEco8akcC6j3miOhjjfzKum5sId+CWhfxdOs/1xauYr8/ZDBtQiRw==
-  dependencies:
-    sax ">=0.6.0"
-    util.promisify "~1.0.0"
-    xmlbuilder "~11.0.0"
-
-xmlbuilder@~11.0.0:
-  version "11.0.1"
-  resolved "https://registry.yarnpkg.com/xmlbuilder/-/xmlbuilder-11.0.1.tgz#be9bae1c8a046e76b31127726347d0ad7002beb3"
-  integrity sha512-fDlsI/kFEx7gLvbecc0/ohLG50fugQp8ryHzMTuW9vSa1GJ0XYWKnhsUx7oie3G98+r56aTQIUB4kht42R3JvA==
-
 xmlbuilder@~9.0.1:
   version "9.0.7"
   resolved "https://registry.yarnpkg.com/xmlbuilder/-/xmlbuilder-9.0.7.tgz#132ee63d2ec5565c557e20f4c22df9aca686b10d"