diff --git a/.github/workflows/lab-autograding.yml b/.github/workflows/lab-autograding.yml
new file mode 100644
index 00000000..47a49147
--- /dev/null
+++ b/.github/workflows/lab-autograding.yml
@@ -0,0 +1,55 @@
+name: Autograding
+
+on:
+    pull_request_target:
+        types: [labeled, synchronize, opened, reopened, ready_for_review]
+
+jobs:
+    build:
+        runs-on: ${{ matrix.os }}
+        strategy:
+            matrix:
+                os: [ubuntu-22.04]
+            fail-fast: false
+        steps:
+            - uses: actions/checkout@v4
+              with:
+                  ref: "${{ github.event.pull_request.merge_commit_sha }}"
+                  fetch-depth: 1
+            - uses: actions/setup-node@v4
+              with:
+                  node-version: latest
+            - name: Extract lab number and Check no changes other than specific files
+              uses: actions/github-script@v5
+              id: lab
+              with:
+                  result-encoding: string
+                  github-token: ${{ secrets.GITHUB_TOKEN }}
+                  script: |
+                      const { owner, repo, number: issue_number } = context.issue;
+                      const pr = await github.rest.pulls.get({ owner, repo, pull_number: issue_number });
+                      const labels = pr.data.labels;
+                      const lab = labels.find((label) => label.name.startsWith('lab'));
+                      if (!lab) {
+                        core.setFailed('No lab label found on the PR.');
+                        return { number: 0 };
+                      }
+                      const labNumberMatch = lab.name.match(/lab(\d+)/);
+                      if (!labNumberMatch) {
+                        core.setFailed('Invalid lab label found on the PR.');
+                        return { number: 0 };
+                      }
+                      const labNumber = labNumberMatch[1];
+                      console.log(`Lab number: ${labNumber}`)
+
+                      const files = await github.rest.pulls.listFiles({ owner, repo, pull_number: issue_number });
+                      const changedFiles = files.data.map((file) => file.filename);
+                      const allowedFileRegex = /^lab\d+\/main_test.js$/;
+                      if (!changedFiles.every((file) => allowedFileRegex.test(file))) {
+                        core.setFailed('The PR contains changes to files other than the allowed files.');
+                      }
+                      return labNumber;
+            - name: Grading
+              run: |
+                  cd lab${{ steps.lab.outputs.result }}
+                  ./validate.sh
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..40b878db
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules/
\ No newline at end of file
diff --git a/lab3/README.md b/lab3/README.md
new file mode 100644
index 00000000..f95c2ca0
--- /dev/null
+++ b/lab3/README.md
@@ -0,0 +1,29 @@
+# Lab3
+
+## Introduction
+
+In this lab, you will write unit tests for functions implemented in `main.js`. You can learn how to use classes and functions in it by uncommenting the code in it. (But remember don't commit them on GitHub)
+
+## Preparation (Important!!!)
+
+1. Sync fork on GitHub
+2. `git checkout -b lab3` (**NOT** your student ID !!!)
+
+## Requirement
+
+1. (40%) Write test cases in `main_test.js` and achieve 100% code coverage.
+2. (30%) For each function, parameterize their testcases to test the error-results.
+3. (30%) For each function, use at least 3 parameterized testcases to test the non-error-results.
+
+You can run `validate.sh` in your local to test if you satisfy the requirements.
+
+Please note that you must not alter files other than `main_test.js`. You will get 0 points if
+
+1. you modify other files to achieve requirements.
+2. you can't pass all CI on your PR.
+
+## Submission
+
+You need to open a pull request to your branch (e.g. 311XXXXXX, your student number) and contain the code that satisfies the abovementioned requirements.
+
+Moreover, please submit the URL of your PR to E3. Your submission will only be accepted when you present at both places.
diff --git a/lab3/main.js b/lab3/main.js
new file mode 100644
index 00000000..cee5de7f
--- /dev/null
+++ b/lab3/main.js
@@ -0,0 +1,34 @@
+class Calculator {
+    exp(x) {
+        if (!Number.isFinite(x)) {
+            throw Error('unsupported operand type');
+        }
+        const result = Math.exp(x);
+        if (result === Infinity) {
+            throw Error('overflow');
+        }
+        return result;
+    }
+
+    log(x) {
+        if (!Number.isFinite(x)) {
+            throw Error('unsupported operand type');
+        }
+        const result = Math.log(x);
+        if (result === -Infinity) {
+            throw Error('math domain error (1)');
+        }
+        if (Number.isNaN(result)) {
+            throw Error('math domain error (2)');
+        }
+        return result;
+    }
+}
+
+// const calculator = new Calculator();
+// console.log(calculator.exp(87));
+// console.log(calculator.log(48763));
+
+module.exports = {
+    Calculator
+};
\ No newline at end of file
diff --git a/lab3/main_test.js b/lab3/main_test.js
new file mode 100644
index 00000000..e6d6414e
--- /dev/null
+++ b/lab3/main_test.js
@@ -0,0 +1,5 @@
+const {describe, it} = require('node:test');
+const assert = require('assert');
+const { Calculator } = require('./main');
+
+// TODO: write your tests here
diff --git a/lab3/validate.sh b/lab3/validate.sh
new file mode 100755
index 00000000..7a758fb3
--- /dev/null
+++ b/lab3/validate.sh
@@ -0,0 +1,38 @@
+#!/bin/bash
+
+# Check for unwanted files
+for file in *; do
+  if [[ $file != "main.js" && $file != "main_test.js" && $file != "README.md" && $file != "validate.sh" ]]; then
+    echo "[!] Unwanted file detected: $file."
+    exit 1
+  fi
+done
+
+node=$(which node)
+test_path="${BASH_SOURCE[0]}"
+solution_path="$(realpath .)"
+tmp_dir=$(mktemp -d -t lab3-XXXXXXXXXX)
+
+cd $tmp_dir
+
+rm -rf *
+cp $solution_path/*.js .
+result=$($"node" --test --experimental-test-coverage) ; ret=$?
+if [ $ret -ne 0 ] ; then
+  echo "[!] testing fails"
+  exit 1
+else
+  coverage=$(echo "$result" | grep 'all files' | awk -F '|' '{print $2}' | sed 's/ //g')
+  if (( $(echo "$coverage < 100" | bc -l) )); then
+    echo "[!] Coverage is only $coverage%"
+    exit 1
+  else
+    echo "[V] Coverage is 100%"
+  fi
+fi
+
+rm -rf $tmp_dir
+
+exit 0
+
+# vim: set fenc=utf8 ff=unix et sw=2 ts=2 sts=2:
\ No newline at end of file
diff --git a/lab4/README.md b/lab4/README.md
new file mode 100644
index 00000000..2a719b8b
--- /dev/null
+++ b/lab4/README.md
@@ -0,0 +1,29 @@
+# Lab4
+
+## Introduction
+
+In this lab, you will write tests in `main_test.js`. You can learn how to use [Puppeteer](https://pptr.dev/) to tests a web UI.
+
+## Preparation (Important!!!)
+
+1. Sync fork your branch (e.g., `SQLab:311XXXXXX`)
+2. `git checkout -b lab4` (**NOT** your student ID !!!)
+
+## Requirement
+
+1. (100%) Goto https://pptr.dev/, type `chipi chipi chapa chapa` into the search box, click on **1st** result in the **Docs** section, and print the title.
+
+For the detailed steps and hints, please check the slide of this lab.
+
+You can run `validate.sh` in your local to test if you satisfy the requirements.
+
+Please note that you must not alter files other than `main_test.js`. You will get 0 points if
+
+1. you modify other files to achieve requirements.
+2. you can't pass all CI on your PR.
+
+## Submission
+
+You need to open a pull request to your branch (e.g. 311XXXXXX, your student number) and contain the code that satisfies the abovementioned requirements.
+
+Moreover, please submit the URL of your PR to E3. Your submission will only be accepted when you present at both places.
diff --git a/lab4/main_test.js b/lab4/main_test.js
new file mode 100644
index 00000000..e37d21a5
--- /dev/null
+++ b/lab4/main_test.js
@@ -0,0 +1,22 @@
+const puppeteer = require('puppeteer');
+
+(async () => {
+    // Launch the browser and open a new blank page
+    const browser = await puppeteer.launch();
+    const page = await browser.newPage();
+
+    // Navigate the page to a URL
+    await page.goto('https://pptr.dev/');
+
+    // Hints:
+    // Click search button
+    // Type into search box
+    // Wait for search result
+    // Get the `Docs` result section
+    // Click on first result in `Docs` section
+    // Locate the title
+    // Print the title
+
+    // Close the browser
+    await browser.close();
+})();
\ No newline at end of file
diff --git a/lab4/package-lock.json b/lab4/package-lock.json
new file mode 100644
index 00000000..ced9fee4
--- /dev/null
+++ b/lab4/package-lock.json
@@ -0,0 +1,1174 @@
+{
+  "name": "lab4",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "puppeteer": "^22.5.0"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.24.1",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.24.1.tgz",
+      "integrity": "sha512-bC49z4spJQR3j8vFtJBLqzyzFV0ciuL5HYX7qfSl3KEqeMVV+eTquRvmXxpvB0AMubRrvv7y5DILiLLPi57Ewg==",
+      "dependencies": {
+        "@babel/highlight": "^7.24.1",
+        "picocolors": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-validator-identifier": {
+      "version": "7.22.20",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.22.20.tgz",
+      "integrity": "sha512-Y4OZ+ytlatR8AI+8KZfKuL5urKp7qey08ha31L8b3BwewJAoJamTzyvxPR/5D+KkdJCGPq/+8TukHBlY10FX9A==",
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/highlight": {
+      "version": "7.24.1",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.24.1.tgz",
+      "integrity": "sha512-EPmDPxidWe/Ex+HTFINpvXdPHRmgSF3T8hGvzondYjmgzTQ/0EbLpSxyt+w3zzlYSk9cNBQNF9k0dT5Z2NiBjw==",
+      "dependencies": {
+        "@babel/helper-validator-identifier": "^7.22.20",
+        "chalk": "^2.4.2",
+        "js-tokens": "^4.0.0",
+        "picocolors": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@puppeteer/browsers": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/@puppeteer/browsers/-/browsers-2.2.0.tgz",
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+      "dependencies": {
+        "debug": "4.3.4",
+        "extract-zip": "2.0.1",
+        "progress": "2.0.3",
+        "proxy-agent": "6.4.0",
+        "semver": "7.6.0",
+        "tar-fs": "3.0.5",
+        "unbzip2-stream": "1.4.3",
+        "yargs": "17.7.2"
+      },
+      "bin": {
+        "browsers": "lib/cjs/main-cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@tootallnate/quickjs-emscripten": {
+      "version": "0.23.0",
+      "resolved": "https://registry.npmjs.org/@tootallnate/quickjs-emscripten/-/quickjs-emscripten-0.23.0.tgz",
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+    },
+    "node_modules/@types/node": {
+      "version": "20.11.30",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.11.30.tgz",
+      "integrity": "sha512-dHM6ZxwlmuZaRmUPfv1p+KrdD1Dci04FbdEm/9wEMouFqxYoFl5aMkt0VMAUtYRQDyYvD41WJLukhq/ha3YuTw==",
+      "optional": true,
+      "dependencies": {
+        "undici-types": "~5.26.4"
+      }
+    },
+    "node_modules/@types/yauzl": {
+      "version": "2.10.3",
+      "resolved": "https://registry.npmjs.org/@types/yauzl/-/yauzl-2.10.3.tgz",
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+      "optional": true,
+      "dependencies": {
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+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-7.1.0.tgz",
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+      "dependencies": {
+        "tslib": "^2.0.1"
+      },
+      "engines": {
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+      }
+    },
+    "node_modules/b4a": {
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+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ]
+    },
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+        {
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+        },
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+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
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+          "url": "https://feross.org/support"
+        }
+      ],
+      "dependencies": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.1.13"
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+        "supports-color": "^5.3.0"
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+        "mitt": "3.0.1",
+        "urlpattern-polyfill": "10.0.0",
+        "zod": "3.22.4"
+      },
+      "peerDependencies": {
+        "devtools-protocol": "*"
+      }
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+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ=="
+    },
+    "node_modules/ws": {
+      "version": "8.16.0",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.16.0.tgz",
+      "integrity": "sha512-HS0c//TP7Ina87TfiPUz1rQzMhHrl/SG2guqRcTOIUYD2q8uhUdNHZYJUaQ8aTGPzCh+c6oawMKW35nFl1dxyQ==",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/y18n": {
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
+    },
+    "node_modules/yargs": {
+      "version": "17.7.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
+      "integrity": "sha512-7dSzzRQ++CKnNI/krKnYRV7JKKPUXMEh61soaHKg9mrWEhzFWhFnxPxGl+69cD1Ou63C13NUPCnmIcrvqCuM6w==",
+      "dependencies": {
+        "cliui": "^8.0.1",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.3",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^21.1.1"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "21.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/yauzl": {
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
+      "integrity": "sha512-p4a9I6X6nu6IhoGmBqAcbJy1mlC4j27vEPZX9F4L4/vZT3Lyq1VkFHw/V/PUcB9Buo+DG3iHkT0x3Qya58zc3g==",
+      "dependencies": {
+        "buffer-crc32": "~0.2.3",
+        "fd-slicer": "~1.1.0"
+      }
+    },
+    "node_modules/zod": {
+      "version": "3.22.4",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-3.22.4.tgz",
+      "integrity": "sha512-iC+8Io04lddc+mVqQ9AZ7OQ2MrUKGN+oIQyq1vemgt46jwCwLfhq7/pwnBnNXXXZb8VTVLKwp9EDkx+ryxIWmg==",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
+    }
+  }
+}
diff --git a/lab4/package.json b/lab4/package.json
new file mode 100644
index 00000000..5014ba08
--- /dev/null
+++ b/lab4/package.json
@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "puppeteer": "^22.5.0"
+  }
+}
diff --git a/lab4/validate.sh b/lab4/validate.sh
new file mode 100755
index 00000000..e963b24b
--- /dev/null
+++ b/lab4/validate.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# Check for unwanted files
+for file in *; do
+  if [[ $file != "node_modules" && $file != "main_test.js" && $file != "package-lock.json" && $file != "package.json" && $file != "README.md" && $file != "validate.sh" ]]; then
+    echo "[!] Unwanted file detected: $file."
+    exit 1
+  fi
+done
+
+node=$(which node)
+test_path="${BASH_SOURCE[0]}"
+solution_path="$(realpath .)"
+tmp_dir=$(mktemp -d -t lab4-XXXXXXXXXX)
+answer="Experimental WebDriver BiDi support"
+
+cd $tmp_dir
+
+rm -rf *
+cp $solution_path/*.js .
+cp $solution_path/*.json .
+
+# Install dependencies
+npm ci
+
+result=$($"node" main_test.js) ; ret=$?
+if [ $ret -ne 0 ] ; then
+  echo "[!] testing fails"
+  exit 1
+else
+  title=$(echo "$result" | head -1)
+  if [[ $title != $answer ]]; then
+    echo "[!] Expected: $answer"
+    echo "[!] Actual:   $title"
+    exit 1
+  else
+    echo "[V] Pass"
+  fi
+fi
+
+rm -rf $tmp_dir
+
+exit 0
+
+# vim: set fenc=utf8 ff=unix et sw=2 ts=2 sts=2:
\ No newline at end of file
diff --git a/scripts/merge-all.sh b/scripts/merge-all.sh
new file mode 100755
index 00000000..4743ac08
--- /dev/null
+++ b/scripts/merge-all.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+if [ $# -ne 1 ]; then
+    echo "$0 <commit-message>"
+    exit 1
+fi
+
+git fetch origin
+
+for branch in $(git branch -r | grep -v HEAD); do
+    # Remove the "origin/" prefix
+    branch=${branch#origin/}
+
+    if [[ "$branch" != "main" ]]; then
+        git checkout "$branch"
+        if [[ $? -ne 0 ]]; then
+            echo "Checkout failed for branch $branch"
+            exit 1
+        fi
+        git merge --squash -s recursive -X theirs main
+        if [[ $? -ne 0 ]]; then
+            echo "Merge failed for branch $branch"
+            exit 1
+        fi
+        git commit -m "$1"
+    fi
+done
+
+git checkout main