diff --git a/.circleci/config.yml b/.circleci/config.yml
index e20b3a8e..e2bce283 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,6 +1,9 @@
 version: 2.1
 
 executors:
+  node:
+    docker:
+      - image: circleci/node:10
   firefox:
     docker:
       - image: circleci/node:10
@@ -44,10 +47,19 @@ commands:
             - .yarn
             - .pnp.js
 
+  screenshot:
+    parameters:
+      flags:
+        type: string
+        default: ""
+    steps:
+      - run:
+          name: Verify screenshots and generate diffs and new screenshots
+          command: yarn node dockers/screenshotter/screenshotter.js -b $CIRCLE_JOB --verify --diff --new << parameters.flags >>
+
 jobs:
   test:
-    docker:
-      - image: circleci/node:10
+    executor: node
     steps:
       - run:
           name: Check whether the build is running on the main repository
@@ -80,6 +92,9 @@ jobs:
     parameters:
       browser:
         type: executor
+      browserstack:
+        type: string
+        default: ""
     executor: << parameters.browser >>
     steps:
       - checkout_repo
@@ -87,9 +102,17 @@ jobs:
           filter: '^docs/|^static/|^website/|^LICENSE|\.md$'
       - install_dependencies
 
-      - run:
-          name: Verify screenshots and generate diffs and new screenshots
-          command: yarn node dockers/screenshotter/screenshotter.js --selenium-ip localhost -b $CIRCLE_JOB --verify --diff --new
+      - when:
+          condition: << parameters.browserstack >>
+          steps:
+            - screenshot:
+                flags: --browserstack --selenium-capabilities '<< parameters.browserstack >>'
+      - unless:
+          condition: << parameters.browserstack >>
+          steps:
+            - screenshot:
+                flags: --selenium-ip localhost
+
       - store_artifacts:
           path: test/screenshotter/new
           destination: new
@@ -107,3 +130,17 @@ workflows:
       - screenshotter:
           name: chrome
           browser: chrome
+      - screenshotter:
+          name: safari
+          browser: node
+          browserstack: |
+              {
+                "browserName": "Safari",
+                "browser_version": "13.1",
+                "os": "OS X",
+                "os_version": "Catalina"
+              }
+          filters:
+            branches:
+              # Forked pull requests don't have access to Browserstack credentials
+              ignore: /pull\/[0-9]+/
diff --git a/.gitignore b/.gitignore
index 6c09b9a4..bcc7a2cc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,7 @@
 katex.tar.gz
 katex.zip
 node_modules
-npm-debug.log
-debug.log
+*.log
 last.png
 diff.png
 /.npm-install.stamp
diff --git a/dockers/screenshotter/screenshotter.js b/dockers/screenshotter/screenshotter.js
index f6a9f40a..21074eb9 100644
--- a/dockers/screenshotter/screenshotter.js
+++ b/dockers/screenshotter/screenshotter.js
@@ -15,6 +15,8 @@ const istanbulLibCoverage = require('istanbul-lib-coverage');
 const istanbulLibReport = require('istanbul-lib-report');
 const istanbulReports = require('istanbul-reports');
 
+const browserstack = require('browserstack-local');
+
 const webpack = require('webpack');
 const WebpackDevServer = require("webpack-dev-server");
 const webpackConfig = require("../../webpack.dev")[0];
@@ -59,6 +61,9 @@ const opts = require("commander")
         "Retry this many times before reporting failure", 5, parseInt)
     .option("--wait <secs>",
         "Wait this many seconds between page load and screenshot", parseFloat)
+    .option("--browserstack", "Use Browserstack. The username and access key"
+        + " should be set as enviroment variable BROWSERSTACK_USER and"
+        + " BROWSERSTACK_ACCESS_KEY")
     .parse(process.argv);
 
 let listOfCases;
@@ -81,6 +86,24 @@ let katexURL = opts.katexUrl;
 let katexIP = opts.katexIp;
 let katexPort = opts.katexPort;
 
+let bsLocal;
+if (opts.browserstack) {
+    // https://www.browserstack.com/automate/node
+    if (!seleniumURL) {
+        seleniumURL = "http://hub-cloud.browserstack.com/wd/hub";
+    }
+    // https://www.browserstack.com/local-testing/automate#test-localhost-websites
+    if (!katexIP && opts.browser === "safari") {
+        katexIP = "bs-local.com";
+    }
+    opts.seleniumCapabilities = Object.assign({
+        resolution: "1280x1024",
+        "browserstack.user": process.env.BROWSERSTACK_USER,
+        "browserstack.key": process.env.BROWSERSTACK_ACCESS_KEY,
+        "browserstack.local": true,
+    }, opts.seleniumCapabilities);
+}
+
 //////////////////////////////////////////////////////////////////////
 // Work out connection to selenium docker container
 
@@ -188,7 +211,7 @@ function startServer() {
         devServer = wds;
         katexPort = port;
         attempts = 0;
-        process.nextTick(tryConnect);
+        process.nextTick(opts.browserstack ? startBrowserstackLocal : tryConnect);
     });
     server.on("error", function(err) {
         if (devServer !== null) { // error after we started listening
@@ -201,6 +224,21 @@ function startServer() {
     });
 }
 
+// Start Browserstack Local connection
+function startBrowserstackLocal() {
+    // unique identifier for the session
+    const localIdentifier = process.env.CIRCLE_BUILD_NUM || "p" + katexPort;
+    opts.seleniumCapabilities["browserstack.localIdentifier"] = localIdentifier;
+
+    bsLocal = new browserstack.Local();
+    bsLocal.start({localIdentifier}, function(err) {
+        if (err) {
+            throw err;
+        }
+        process.nextTick(tryConnect);
+    });
+}
+
 //////////////////////////////////////////////////////////////////////
 // Wait for container to become ready
 
@@ -546,7 +584,13 @@ function takeScreenshot(key) {
     function done() {
         // devServer.close(cb) will take too long.
         driver.quit().then(() => {
-            process.exit(exitStatus);
+            if (bsLocal) {
+                bsLocal.stop(() => {
+                    process.exit(exitStatus);
+                });
+            } else {
+                process.exit(exitStatus);
+            }
         });
     }
 }
diff --git a/dockers/screenshotter/screenshotter.sh b/dockers/screenshotter/screenshotter.sh
index 52e023a6..d577221e 100755
--- a/dockers/screenshotter/screenshotter.sh
+++ b/dockers/screenshotter/screenshotter.sh
@@ -17,7 +17,7 @@ cleanup() {
 container=
 trap cleanup EXIT
 status=0
-for browserTag in firefox:2.48.2 chrome:2.48.2; do
+for browserTag in firefox:3.141.59-20200525 chrome:3.141.59-20200525; do
     browser=${browserTag%:*}
     image=selenium/standalone-${browserTag}
     echo "Starting container for ${image}"
@@ -34,4 +34,22 @@ for browserTag in firefox:2.48.2 chrome:2.48.2; do
     echo "${res} taking screenshots, stopping and removing ${container:0:12}"
     cleanup
 done
+
+if [[ $BROWSERSTACK_USER ]]; then
+    echo "Creating screenshots for Safari..."
+    if yarn node "$(dirname "$0")"/screenshotter.js \
+            --browser=safari --browserstack --selenium-capabilities '{
+                "browserName": "Safari",
+                "browser_version": "13.1",
+                "os": "OS X",
+                "os_version": "Catalina"
+            }' "$@"; then
+        res=Done
+    else
+        res=Failed
+        status=1
+    fi
+    echo "${res} taking screenshots"
+fi
+
 exit ${status}
diff --git a/package.json b/package.json
index 54792c65..f965889d 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,7 @@
     "babel-plugin-version-inline": "^1.0.0",
     "benchmark": "^2.1.4",
     "browserslist": "^4.13.0",
+    "browserstack-local": "^1.4.5",
     "caniuse-lite": "^1.0.30001102",
     "codecov": "^3.7.1",
     "css-loader": "^4.0.0",
diff --git a/test/screenshotter/images/Accents-safari.png b/test/screenshotter/images/Accents-safari.png
new file mode 100644
index 00000000..5ec7df84
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diff --git a/test/screenshotter/images/AccentsText-safari.png b/test/screenshotter/images/AccentsText-safari.png
new file mode 100644
index 00000000..36b676b7
Binary files /dev/null and b/test/screenshotter/images/AccentsText-safari.png differ
diff --git a/test/screenshotter/images/Align-safari.png b/test/screenshotter/images/Align-safari.png
new file mode 100644
index 00000000..f8a5c59d
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diff --git a/test/screenshotter/images/Aligned-safari.png b/test/screenshotter/images/Aligned-safari.png
new file mode 100644
index 00000000..8d3f3c78
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diff --git a/test/screenshotter/images/Alignedat-safari.png b/test/screenshotter/images/Alignedat-safari.png
new file mode 100644
index 00000000..db5dcb6d
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diff --git a/test/screenshotter/images/ArrayMode-safari.png b/test/screenshotter/images/ArrayMode-safari.png
new file mode 100644
index 00000000..2957cce0
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diff --git a/test/screenshotter/images/ArrayRemoveEmptyLine-safari.png b/test/screenshotter/images/ArrayRemoveEmptyLine-safari.png
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index 00000000..7a55b5a2
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index 00000000..b0b11996
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index 00000000..67f4133e
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index 00000000..d7ac7c4a
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index 00000000..d8311972
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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diff --git a/test/screenshotter/images/MathTt-safari.png b/test/screenshotter/images/MathTt-safari.png
new file mode 100644
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new file mode 100644
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diff --git a/test/screenshotter/images/ModScript-safari.png b/test/screenshotter/images/ModScript-safari.png
new file mode 100644
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new file mode 100644
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diff --git a/test/screenshotter/images/NegativeSpace-safari.png b/test/screenshotter/images/NegativeSpace-safari.png
new file mode 100644
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diff --git a/test/screenshotter/images/NegativeSpaceBetweenRel-safari.png b/test/screenshotter/images/NegativeSpaceBetweenRel-safari.png
new file mode 100644
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new file mode 100644
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diff --git a/test/screenshotter/images/NewLine-safari.png b/test/screenshotter/images/NewLine-safari.png
new file mode 100644
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diff --git a/test/screenshotter/images/Not-safari.png b/test/screenshotter/images/Not-safari.png
new file mode 100644
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new file mode 100644
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Binary files /dev/null and b/test/screenshotter/images/NullDelimiterInteraction-safari.png differ
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new file mode 100644
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Binary files /dev/null and b/test/screenshotter/images/OldFont-safari.png differ
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new file mode 100644
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diff --git a/test/screenshotter/images/OperatorName-safari.png b/test/screenshotter/images/OperatorName-safari.png
new file mode 100644
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diff --git a/test/screenshotter/images/OverUnderline-safari.png b/test/screenshotter/images/OverUnderline-safari.png
new file mode 100644
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diff --git a/test/screenshotter/images/OverUnderset-safari.png b/test/screenshotter/images/OverUnderset-safari.png
new file mode 100644
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Binary files /dev/null and b/test/screenshotter/images/OverUnderset-safari.png differ
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new file mode 100644
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new file mode 100644
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Binary files /dev/null and b/test/screenshotter/images/Pmb-safari.png differ
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new file mode 100644
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Binary files /dev/null and b/test/screenshotter/images/PrimeSpacing-safari.png differ
diff --git a/test/screenshotter/images/PrimeSuper-safari.png b/test/screenshotter/images/PrimeSuper-safari.png
new file mode 100644
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Binary files /dev/null and b/test/screenshotter/images/PrimeSuper-safari.png differ
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new file mode 100644
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Binary files /dev/null and b/test/screenshotter/images/Raisebox-safari.png differ
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new file mode 100644
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Binary files /dev/null and b/test/screenshotter/images/ReactionArrows-safari.png differ
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new file mode 100644
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Binary files /dev/null and b/test/screenshotter/images/RelativeUnits-safari.png differ
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new file mode 100644
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Binary files /dev/null and b/test/screenshotter/images/RlapBug-safari.png differ
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Binary files /dev/null and b/test/screenshotter/images/Rule-safari.png differ
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Binary files /dev/null and b/test/screenshotter/images/Sizing-safari.png differ
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Binary files /dev/null and b/test/screenshotter/images/Smash-safari.png differ
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Binary files /dev/null and b/test/screenshotter/images/Spacing-safari.png differ
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Binary files /dev/null and b/test/screenshotter/images/Sqrt-safari.png differ
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Binary files /dev/null and b/test/screenshotter/images/StackRel-safari.png differ
diff --git a/test/screenshotter/images/StretchyAccent-safari.png b/test/screenshotter/images/StretchyAccent-safari.png
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Binary files /dev/null and b/test/screenshotter/images/StretchyAccent-safari.png differ
diff --git a/test/screenshotter/images/StretchyAccentColor-safari.png b/test/screenshotter/images/StretchyAccentColor-safari.png
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new file mode 100644
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Binary files /dev/null and b/test/screenshotter/images/StrikeThrough-safari.png differ
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Binary files /dev/null and b/test/screenshotter/images/StrikeThroughColor-safari.png differ
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new file mode 100644
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new file mode 100644
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Binary files /dev/null and b/test/screenshotter/images/SupSubLeftAlignReset-safari.png differ
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Binary files /dev/null and b/test/screenshotter/images/SvgReset-safari.png differ
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diff --git a/test/screenshotter/images/Tag-safari.png b/test/screenshotter/images/Tag-safari.png
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diff --git a/test/screenshotter/images/Text-safari.png b/test/screenshotter/images/Text-safari.png
new file mode 100644
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diff --git a/test/screenshotter/images/TextWithMath-safari.png b/test/screenshotter/images/TextWithMath-safari.png
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diff --git a/test/screenshotter/images/Unicode-safari.png b/test/screenshotter/images/Unicode-safari.png
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diff --git a/test/screenshotter/images/Units-safari.png b/test/screenshotter/images/Units-safari.png
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diff --git a/test/screenshotter/images/UnsupportedCmds-safari.png b/test/screenshotter/images/UnsupportedCmds-safari.png
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diff --git a/test/screenshotter/images/Verb-safari.png b/test/screenshotter/images/Verb-safari.png
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diff --git a/test/screenshotter/images/VerticalSpacing-safari.png b/test/screenshotter/images/VerticalSpacing-safari.png
new file mode 100644
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diff --git a/yarn.lock b/yarn.lock
index 0435a418..da4e9408 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2939,6 +2939,18 @@ __metadata:
   languageName: node
   linkType: hard
 
+"browserstack-local@npm:^1.4.5":
+  version: 1.4.5
+  resolution: "browserstack-local@npm:1.4.5"
+  dependencies:
+    https-proxy-agent: ^4.0.0
+    is-running: ^2.1.0
+    ps-tree: =1.2.0
+    temp-fs: ^0.9.9
+  checksum: ad58653e3fbead3e8f687aed2d7bd5cfd1ce19fa0c916d073ba34d6cddc5960b7712b771300c051355ee39009388323b0ad39223246e1c69adbdf173e54b81ce
+  languageName: node
+  linkType: hard
+
 "bser@npm:2.1.1":
   version: 2.1.1
   resolution: "bser@npm:2.1.1"
@@ -4433,7 +4445,7 @@ __metadata:
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-"duplexer@npm:^0.1.1":
+"duplexer@npm:^0.1.1, duplexer@npm:~0.1.1":
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   checksum: cd332f728a580abef8a87b38e129c7425d34b7dcc4e1b596da300bb3309e10ba51848429a0c0d1f134b66cae8c9ffe1371e3718c74a6f57da2a544a589b21216
@@ -4869,6 +4881,21 @@ __metadata:
   languageName: node
   linkType: hard
 
+"event-stream@npm:=3.3.4":
+  version: 3.3.4
+  resolution: "event-stream@npm:3.3.4"
+  dependencies:
+    duplexer: ~0.1.1
+    from: ~0
+    map-stream: ~0.1.0
+    pause-stream: 0.0.11
+    split: 0.3
+    stream-combiner: ~0.0.4
+    through: ~2.3.1
+  checksum: dd5a563370ed94cfcc8f495528fd4795505d5ee7a991ea7870ec550dd9a785c121b47e931eb3e82be7ff0f449ae113b8026468249715ac432ffa9d402317715e
+  languageName: node
+  linkType: hard
+
 "eventemitter3@npm:^4.0.0":
   version: 4.0.4
   resolution: "eventemitter3@npm:4.0.4"
@@ -5410,6 +5437,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"from@npm:~0":
+  version: 0.1.7
+  resolution: "from@npm:0.1.7"
+  checksum: 23cc6301f6475806242a68cc2d70e40d363ffe0590c4c053c44638a9fb8c7c77a521f20d5c880b10a5e523a7ba1ca3e0827ccef32bddf0f3ad7b6bda771b1194
+  languageName: node
+  linkType: hard
+
 "fs-extra@npm:^9.0.1":
   version: 9.0.1
   resolution: "fs-extra@npm:9.0.1"
@@ -5599,7 +5633,7 @@ fsevents@^1.2.7:
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-"glob@npm:^7.0.3, glob@npm:^7.1.1, glob@npm:^7.1.2, glob@npm:^7.1.3, glob@npm:^7.1.4":
+"glob@npm:^7.0.3, glob@npm:^7.0.5, glob@npm:^7.1.1, glob@npm:^7.1.2, glob@npm:^7.1.3, glob@npm:^7.1.4":
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   resolution: "glob@npm:7.1.6"
   dependencies:
@@ -6782,6 +6816,13 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"is-running@npm:^2.1.0":
+  version: 2.1.0
+  resolution: "is-running@npm:2.1.0"
+  checksum: 12b75e9513a8e801f6e5a2874c68cf84ace4e2f91cff8ccf14a37a7a6ee6ea79e4e2d384451191e3d84ad137327446144635a5fd4bb13a0c1e483f0931e9b876
+  languageName: node
+  linkType: hard
+
 "is-stream@npm:^1.1.0":
   version: 1.1.0
   resolution: "is-stream@npm:1.1.0"
@@ -7665,6 +7706,7 @@ fsevents@^1.2.7:
     babel-plugin-version-inline: ^1.0.0
     benchmark: ^2.1.4
     browserslist: ^4.13.0
+    browserstack-local: ^1.4.5
     caniuse-lite: ^1.0.30001102
     codecov: ^3.7.1
     commander: ^6.0.0
@@ -8079,6 +8121,13 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"map-stream@npm:~0.1.0":
+  version: 0.1.0
+  resolution: "map-stream@npm:0.1.0"
+  checksum: 46003aa4a78c32d2f6d6e71d93f3401cf97ee1823117d1b148872d50373d3642fc1becdbbbf4f27b40692db7cd1cb770fc2be282f2bd785662c68eb1956a1219
+  languageName: node
+  linkType: hard
+
 "map-visit@npm:^1.0.0":
   version: 1.0.0
   resolution: "map-visit@npm:1.0.0"
@@ -9335,6 +9384,15 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"pause-stream@npm:0.0.11":
+  version: 0.0.11
+  resolution: "pause-stream@npm:0.0.11"
+  dependencies:
+    through: ~2.3
+  checksum: a6bcf306f5e7f2cca0adcb424a6c7fa2760233ffd0631695421fdb29cdf8fbaf734161a6e97ebd05c83764b950029167036b0bb9898b36ae772ad5ad48862e91
+  languageName: node
+  linkType: hard
+
 "pbkdf2@npm:^3.0.3":
   version: 3.1.1
   resolution: "pbkdf2@npm:3.1.1"
@@ -10414,6 +10472,17 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"ps-tree@npm:=1.2.0":
+  version: 1.2.0
+  resolution: "ps-tree@npm:1.2.0"
+  dependencies:
+    event-stream: =3.3.4
+  bin:
+    ps-tree: ./bin/ps-tree.js
+  checksum: 0dd001ab27d022acc6226ebf54938deaf151200f778d5f34470dcfe7395e5695331c588641c574e742d3933803c0b974802bd2c22ebe1584afe1c93f319b02cf
+  languageName: node
+  linkType: hard
+
 "psl@npm:^1.1.28":
   version: 1.8.0
   resolution: "psl@npm:1.8.0"
@@ -11079,6 +11148,17 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"rimraf@npm:~2.5.2":
+  version: 2.5.4
+  resolution: "rimraf@npm:2.5.4"
+  dependencies:
+    glob: ^7.0.5
+  bin:
+    rimraf: ./bin.js
+  checksum: d61ffc54a6ee083db7540ac7cb6b87bc58538271303f52b32a146c059cdb93d914e94a4468960f4e09b15b783777bdc6b2461b1ac157d5abe034edfdc7e38318
+  languageName: node
+  linkType: hard
+
 "ripemd160@npm:^2.0.0, ripemd160@npm:^2.0.1":
   version: 2.0.2
   resolution: "ripemd160@npm:2.0.2"
@@ -11720,6 +11800,15 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"split@npm:0.3":
+  version: 0.3.3
+  resolution: "split@npm:0.3.3"
+  dependencies:
+    through: 2
+  checksum: 4e20ae69b398d29820873dbba48baeefb6c1db3250cb2cdd467d91d571ea97232e94f21438d08824655d9436fd1c9994ce80e533c7b6a01923332f271bc8a1f4
+  languageName: node
+  linkType: hard
+
 "sprintf-js@npm:~1.0.2":
   version: 1.0.3
   resolution: "sprintf-js@npm:1.0.3"
@@ -11830,6 +11919,15 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"stream-combiner@npm:~0.0.4":
+  version: 0.0.4
+  resolution: "stream-combiner@npm:0.0.4"
+  dependencies:
+    duplexer: ~0.1.1
+  checksum: 0c936c1cb4f0cef21aef31e06d92b4bd39b4243f6dad5e2ce576d4b09c208c30fdc9f269c4a1435da5d2ff42eaa4ba25fcae886db08046effdc03b7e2d0ddcc6
+  languageName: node
+  linkType: hard
+
 "stream-each@npm:^1.1.0":
   version: 1.2.3
   resolution: "stream-each@npm:1.2.3"
@@ -12306,6 +12404,15 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"temp-fs@npm:^0.9.9":
+  version: 0.9.9
+  resolution: "temp-fs@npm:0.9.9"
+  dependencies:
+    rimraf: ~2.5.2
+  checksum: 64c93d36b68e6a8f6d6ae279c3c9524977d27f6b62db1a9814da3ded81e6eb24447696b2c13ec02dddafeff95dfb316d29cb6f74aaeed0c7171d2af3b6da5e99
+  languageName: node
+  linkType: hard
+
 "terminal-link@npm:^2.0.0":
   version: 2.1.1
   resolution: "terminal-link@npm:2.1.1"
@@ -12402,6 +12509,13 @@ fsevents@^1.2.7:
   languageName: node
   linkType: hard
 
+"through@npm:2, through@npm:~2.3, through@npm:~2.3.1":
+  version: 2.3.8
+  resolution: "through@npm:2.3.8"
+  checksum: 918d9151680b5355990011eb8c4b02e8cb8cf6e9fb6ea3d3e5a1faa688343789e261634ae35de4ea9167ab029d1e7bac6af2fe61b843931768d405fdc3e8897c
+  languageName: node
+  linkType: hard
+
 "thunky@npm:^1.0.2":
   version: 1.1.0
   resolution: "thunky@npm:1.1.0"