diff --git a/.changeset/fluffy-ladybugs-fry.md b/.changeset/fluffy-ladybugs-fry.md
new file mode 100644
index 00000000..702bec98
--- /dev/null
+++ b/.changeset/fluffy-ladybugs-fry.md
@@ -0,0 +1,5 @@
+---
+"microsite": patch
+---
+
+Remove prettier from core dependencies
diff --git a/.changeset/late-lions-leave.md b/.changeset/late-lions-leave.md
new file mode 100644
index 00000000..0c92119a
--- /dev/null
+++ b/.changeset/late-lions-leave.md
@@ -0,0 +1,5 @@
+---
+"microsite": patch
+---
+
+Remove PostCSS logic from core dependencies. Microsite will prompt users to install PostCSS locally if detected.
diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
new file mode 100644
index 00000000..8ad171bc
--- /dev/null
+++ b/.github/CONTRIBUTING.md
@@ -0,0 +1,35 @@
+# Contributing to Microsite
+
+This codebase is a monorepo, set up with [Lerna](https://github.com/lerna/lerna). You should start by familiarizing yourself with `lerna`, as it operates a little bit differently than the standard Node/NPM workflow. 
+
+> Note: Commands should generally be run from the root directory of the monorepo rather than a subdirectory like `packages/microsite`.
+
+## Initial dev setup
+
+1. Install [Volta](https://volta.sh/) if you haven't already. It's our favorite tools for managing Node/NPM versions, and automatically picks up the correct Node version for this project.
+
+2. Install dependencies for the monorepo: `npm install`.
+
+3. Install and link dependencies in sub-packages: `npx lerna bootstrap`
+
+## Adding features/fixing bugs
+Please open an issue describing your feature/bug before opening a PR.
+
+Please ensure that your PR is covered by a test, if applicable. Microsite currently has very fews tests but this is something we hope to prioritize.
+
+## Testing
+
+Our tests are written in TypeScript with [`uvu`](https://github.com/lukeed/uvu). They are run with the `uvu` CLI and [`@swc-node/register`](https://github.com/Brooooooklyn/swc-node/tree/master/packages/register).
+
+> Note: as of `@swc-node/register@1.0.3`, `jsxFactory` and `jsxFragmentFactory` are not respected. This means any Preact components need to include the following comment at the top of the file:
+> `/* @jsx h */`
+> This should be fixed in the next version of `@swc-node/register`.
+
+```bash
+npm run test
+
+# Or watch mode (requires a file change to run the first time)
+npm run test:watch
+```
+
+**VSCode:** There are launch actions included for both single-run and watch mode.
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 00000000..1ccb36f9
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,21 @@
+name: Test
+
+on: push
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - uses: volta-cli/action@v1
+
+    - run: npm ci
+
+    - run: npm run bootstrap:ci
+
+    - run: npm run test
diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 00000000..c120bbfd
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,35 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+      {
+          "name": "Run tests",
+          "request": "launch",
+          "console": "integratedTerminal",
+          "autoAttachChildProcesses": true,
+          "runtimeArgs": [
+              "run-script",
+              "test"
+          ],
+          "runtimeExecutable": "npm",
+          "skipFiles": [
+              "<node_internals>/**"
+          ],
+          "type": "pwa-node"
+      },
+      {
+          "name": "Watch tests",
+          "request": "launch",
+          "console": "integratedTerminal",
+          "autoAttachChildProcesses": true,
+          "runtimeArgs": [
+              "run-script",
+              "test:watch"
+          ],
+          "runtimeExecutable": "npm",
+          "skipFiles": [
+              "<node_internals>/**"
+          ],
+          "type": "pwa-node"
+      },
+  ]
+}
diff --git a/package-lock.json b/package-lock.json
index d44a68e3..1930aff0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2621,6 +2621,30 @@
         "glob-to-regexp": "^0.3.0"
       }
     },
+    "@napi-rs/triples": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@napi-rs/triples/-/triples-1.0.2.tgz",
+      "integrity": "sha512-EL3SiX43m9poFSnhDx4d4fn9SSaqyO2rHsCNhETi9bWPmjXK3uPJ0QpPFtx39FEdHcz1vJmsiW41kqc0AgvtzQ==",
+      "dev": true
+    },
+    "@node-rs/helper": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@node-rs/helper/-/helper-1.0.0.tgz",
+      "integrity": "sha512-B4CSMHCuYPqai3LMsRTXyvBEP24YRnCZUUsDPYkgFD6tFA+q43rLkaEzsnTJTKJq5ZnJ4n5YJpJwEz7Xn8+0vg==",
+      "dev": true,
+      "requires": {
+        "@napi-rs/triples": "^1.0.2",
+        "tslib": "^2.0.3"
+      },
+      "dependencies": {
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+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.1.0.tgz",
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+          "dev": true
+        }
+      }
+    },
     "@nodelib/fs.scandir": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.3.tgz",
@@ -2830,6 +2854,170 @@
         "@types/node": ">= 8"
       }
     },
+    "@swc-node/core": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/@swc-node/core/-/core-1.2.0.tgz",
+      "integrity": "sha512-b2/KhALbKlrxCfnYbxm8aB4TmlmQwTuQkuZMGxmx4UaGKEgw78tdbR+eS45lWdBRv30/CeCHermMxcxwvU7DXg==",
+      "dev": true,
+      "requires": {
+        "@swc/core": "^1.2.46"
+      }
+    },
+    "@swc-node/register": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/@swc-node/register/-/register-1.0.4.tgz",
+      "integrity": "sha512-svYIPXdApREvZwc3gAufs8A4dT8pWjJdwsPfuFxcJ0hKnTWqWN11XOLOEFOVIR+76BYIRKZxlcNrDF2rP1FIzw==",
+      "dev": true,
+      "requires": {
+        "@swc-node/core": "^1.2.0",
+        "@swc-node/sourcemap-support": "^0.1.8",
+        "chalk": "^4.1.0",
+        "debug": "^4.3.1",
+        "pirates": "^4.0.1"
+      },
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+          "dev": true,
+          "requires": {
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+          }
+        },
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+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.0.tgz",
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+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.1.0",
+            "supports-color": "^7.1.0"
+          }
+        },
+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
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+          "dev": true,
+          "requires": {
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+          }
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+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
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+          "dev": true,
+          "requires": {
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+          }
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+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
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+          "dev": true
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+          "dev": true,
+          "requires": {
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+          }
+        }
+      }
+    },
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+      "dev": true,
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+        "@swc/core-darwin-x64": "^1.2.46",
+        "@swc/core-linux-arm-gnueabihf": "^1.2.46",
+        "@swc/core-linux-arm64-gnu": "^1.2.46",
+        "@swc/core-linux-x64-gnu": "^1.2.46",
+        "@swc/core-linux-x64-musl": "^1.2.46",
+        "@swc/core-win32-x64-msvc": "^1.2.46"
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+    },
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+      "dev": true,
+      "optional": true
+    },
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+      "version": "1.2.46",
+      "resolved": "https://registry.npmjs.org/@swc/core-linux-x64-musl/-/core-linux-x64-musl-1.2.46.tgz",
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+      "dev": true,
+      "optional": true
+    },
+    "@swc/core-win32-x64-msvc": {
+      "version": "1.2.46",
+      "resolved": "https://registry.npmjs.org/@swc/core-win32-x64-msvc/-/core-win32-x64-msvc-1.2.46.tgz",
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+    },
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       "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.3.tgz",
@@ -2897,12 +3085,40 @@
         "through": ">=2.2.7 <3"
       }
     },
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+      "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.5.tgz",
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       "dev": true
     },
+    "acorn": {
+      "version": "7.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.4.1.tgz",
+      "integrity": "sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==",
+      "dev": true
+    },
+    "acorn-globals": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-6.0.0.tgz",
+      "integrity": "sha512-ZQl7LOWaF5ePqqcX4hLuv/bLXYQNfNWw2c0/yX/TsPRKamzHcTGQnlCjHT3TsmkOUVEPS3crCxiPfdzE/Trlhg==",
+      "dev": true,
+      "requires": {
+        "acorn": "^7.1.1",
+        "acorn-walk": "^7.1.1"
+      }
+    },
+    "acorn-walk": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-7.2.0.tgz",
+      "integrity": "sha512-OPdCF6GsMIP+Az+aWfAAOEt2/+iVDKE7oy6lJ098aoe59oAmK76qV6Gw60SbZ8jHuG2wH058GF4pLFbYamYrVA==",
+      "dev": true
+    },
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@@ -3370,6 +3586,12 @@
         "wcwidth": "^1.0.1"
       }
     },
+    "browser-process-hrtime": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/browser-process-hrtime/-/browser-process-hrtime-1.0.0.tgz",
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+      "dev": true
+    },
     "btoa-lite": {
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@@ -4475,6 +4697,29 @@
         "which": "^2.0.1"
       }
     },
+    "cssom": {
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+      "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.4.4.tgz",
+      "integrity": "sha512-p3pvU7r1MyyqbTk+WbNJIgJjG2VmTIaB10rI93LzVPrmDJKkzKYMtxxyAvQXR/NS6otuzveI7+7BBq3SjBS2mw==",
+      "dev": true
+    },
+    "cssstyle": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/cssstyle/-/cssstyle-2.3.0.tgz",
+      "integrity": "sha512-AZL67abkUzIuvcHqk7c09cezpGNcxUxU4Ioi/05xHk4DQeTkWmGYftIE6ctU6AEt+Gn4n1lDStOtj7FKycP71A==",
+      "dev": true,
+      "requires": {
+        "cssom": "~0.3.6"
+      },
+      "dependencies": {
+        "cssom": {
+          "version": "0.3.8",
+          "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.8.tgz",
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+          "dev": true
+        }
+      }
+    },
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@@ -4538,6 +4783,45 @@
         "assert-plus": "^1.0.0"
       }
     },
+    "data-urls": {
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+      "resolved": "https://registry.npmjs.org/data-urls/-/data-urls-2.0.0.tgz",
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+      "dev": true,
+      "requires": {
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+        "whatwg-mimetype": "^2.3.0",
+        "whatwg-url": "^8.0.0"
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+          "dev": true,
+          "requires": {
+            "punycode": "^2.1.1"
+          }
+        },
+        "webidl-conversions": {
+          "version": "6.1.0",
+          "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-6.1.0.tgz",
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+          "dev": true
+        },
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     "semver": {
       "version": "5.7.1",
       "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
@@ -9201,6 +9752,16 @@
         "urix": "^0.1.0"
       }
     },
+    "source-map-support": {
+      "version": "0.5.19",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.19.tgz",
+      "integrity": "sha512-Wonm7zOCIJzBGQdB+thsPar0kYuCIzYvxZwlBa87yi/Mdjv7Tip2cyVbLj5o0cFPN4EVkuTwb3GDDyUx2DGnGw==",
+      "dev": true,
+      "requires": {
+        "buffer-from": "^1.0.0",
+        "source-map": "^0.6.0"
+      }
+    },
     "source-map-url": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/source-map-url/-/source-map-url-0.4.0.tgz",
@@ -9366,6 +9927,12 @@
         }
       }
     },
+    "stealthy-require": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/stealthy-require/-/stealthy-require-1.1.1.tgz",
+      "integrity": "sha1-NbCYdbT/SfJqd35QmzCQoyJr8ks=",
+      "dev": true
+    },
     "stream-each": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/stream-each/-/stream-each-1.2.3.tgz",
@@ -9563,6 +10130,12 @@
         "has-flag": "^3.0.0"
       }
     },
+    "symbol-tree": {
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
+      "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
+      "dev": true
+    },
     "tar": {
       "version": "4.4.13",
       "resolved": "https://registry.npmjs.org/tar/-/tar-4.4.13.tgz",
@@ -9716,6 +10289,12 @@
         "is-number": "^7.0.0"
       }
     },
+    "totalist": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/totalist/-/totalist-2.0.0.tgz",
+      "integrity": "sha512-+Y17F0YzxfACxTyjfhnJQEe7afPA0GSpYlFkl2VFMxYP7jshQf9gXV7cH47EfToBumFThfKBvfAcoUn6fdNeRQ==",
+      "dev": true
+    },
     "tough-cookie": {
       "version": "2.5.0",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.5.0.tgz",
@@ -9848,6 +10427,15 @@
       "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
       "dev": true
     },
+    "type-check": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
+      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
+      "dev": true,
+      "requires": {
+        "prelude-ls": "~1.1.2"
+      }
+    },
     "type-fest": {
       "version": "0.11.0",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
@@ -10024,6 +10612,27 @@
       "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A==",
       "dev": true
     },
+    "uvu": {
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/uvu/-/uvu-0.5.1.tgz",
+      "integrity": "sha512-JGxttnOGDFs77FaZ0yMUHIzczzQ5R1IlDeNW6Wymw6gAscwMdAffVOP6TlxLIfReZyK8tahoGwWZaTCJzNFDkg==",
+      "dev": true,
+      "requires": {
+        "dequal": "^2.0.0",
+        "diff": "^5.0.0",
+        "kleur": "^4.0.3",
+        "sade": "^1.7.3",
+        "totalist": "^2.0.0"
+      },
+      "dependencies": {
+        "diff": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/diff/-/diff-5.0.0.tgz",
+          "integrity": "sha512-/VTCrvm5Z0JGty/BWHljh+BAiw3IK+2j87NGMu8Nwc/f48WoDAC395uomO9ZD117ZOBaHmkX1oyLvkVM/aIT3w==",
+          "dev": true
+        }
+      }
+    },
     "validate-npm-package-license": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -10062,6 +10671,33 @@
         "extsprintf": "^1.2.0"
       }
     },
+    "w3c-hr-time": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.2.tgz",
+      "integrity": "sha512-z8P5DvDNjKDoFIHK7q8r8lackT6l+jo/Ye3HOle7l9nICP9lf1Ci25fy9vHd0JOWewkIFzXIEig3TdKT7JQ5fQ==",
+      "dev": true,
+      "requires": {
+        "browser-process-hrtime": "^1.0.0"
+      }
+    },
+    "w3c-xmlserializer": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-2.0.0.tgz",
+      "integrity": "sha512-4tzD0mF8iSiMiNs30BiLO3EpfGLZUT2MSX/G+o7ZywDzliWQ3OPtTZ0PTC3B3ca1UAf4cJMHB+2Bf56EriJuRA==",
+      "dev": true,
+      "requires": {
+        "xml-name-validator": "^3.0.0"
+      }
+    },
+    "watchlist": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/watchlist/-/watchlist-0.2.3.tgz",
+      "integrity": "sha512-xStuPg489QXZbRirnmIMo7OaKFnGkvTQn7tCUC/sVmVVEvDQQnnVl/k9D5yg3nXgpebgPHpfApBLHMpEbAqvSQ==",
+      "dev": true,
+      "requires": {
+        "mri": "^1.1.5"
+      }
+    },
     "wcwidth": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",
@@ -10077,6 +10713,21 @@
       "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
       "dev": true
     },
+    "whatwg-encoding": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
+      "integrity": "sha512-b5lim54JOPN9HtzvK9HFXvBma/rnfFeqsic0hSpjtDbVxR3dJKLc+KB4V6GgiGOvl7CY/KNh8rxSo9DKQrnUEw==",
+      "dev": true,
+      "requires": {
+        "iconv-lite": "0.4.24"
+      }
+    },
+    "whatwg-mimetype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz",
+      "integrity": "sha512-M4yMwr6mAnQz76TbJm914+gPpB/nCwvZbJU28cUD6dR004SAxDLOOSUaB1JDRqLtaOV/vi0IC5lEAGFgrjGv/g==",
+      "dev": true
+    },
     "whatwg-url": {
       "version": "7.1.0",
       "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-7.1.0.tgz",
@@ -10230,6 +10881,12 @@
         }
       }
     },
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "dev": true
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -10374,6 +11031,24 @@
         }
       }
     },
+    "ws": {
+      "version": "7.4.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.2.tgz",
+      "integrity": "sha512-T4tewALS3+qsrpGI/8dqNMLIVdq/g/85U98HPMa6F0m6xTbvhXU6RCQLqPH3+SlomNV/LdY6RXEbBpMH6EOJnA==",
+      "dev": true
+    },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
+      "dev": true
+    },
+    "xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true
+    },
     "xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
diff --git a/package.json b/package.json
index 83c0b70c..1a62e0c4 100644
--- a/package.json
+++ b/package.json
@@ -9,16 +9,22 @@
     "build": "npx lerna run build --scope=microsite --scope=create-microsite --sort",
     "prebuild:examples": "node scripts/generate-examples",
     "build:examples": "npx lerna run build --scope='@example/*' --parallel",
-    "postbuild:examples": "node scripts/copy-examples"
+    "postbuild:examples": "node scripts/copy-examples",
+    "test": "SWC_NODE_PROJECT=./tsconfig.test.json uvu packages test -r @swc-node/register -i _fixtures",
+    "test:watch": "watchlist packages -- npm run test"
   },
   "devDependencies": {
     "@changesets/cli": "^2.11.2",
+    "@swc-node/register": "1.0.4",
     "fs-extra": "^9.0.1",
     "husky": "^4.3.0",
+    "jsdom": "^16.4.0",
     "lerna": "^3.22.1",
     "lint-staged": "^10.4.2",
     "prettier": "^2.1.2",
-    "typescript": "^4.1.2"
+    "typescript": "^4.1.2",
+    "uvu": "^0.5.0",
+    "watchlist": "0.2.3"
   },
   "volta": {
     "node": "12.20.1"
diff --git a/packages/create-microsite/test/example.ts b/packages/create-microsite/test/example.ts
new file mode 100644
index 00000000..b0bc4e65
--- /dev/null
+++ b/packages/create-microsite/test/example.ts
@@ -0,0 +1,10 @@
+import { suite } from 'uvu';
+import * as assert from 'uvu/assert';
+
+const a = suite('a');
+
+a('a test', () => {
+  assert.is(1, 1);
+});
+
+a.run();
diff --git a/packages/microsite/assets/snowpack.config.cjs b/packages/microsite/assets/snowpack.config.cjs
index 11efaf7f..479b413d 100644
--- a/packages/microsite/assets/snowpack.config.cjs
+++ b/packages/microsite/assets/snowpack.config.cjs
@@ -8,9 +8,9 @@ module.exports = {
     '@prefresh/snowpack',
     'microsite/assets/snowpack-plugin.cjs'
   ],
-  installOptions: {
-    installTypes: true,
-    externalPackage: [
+  packageOptions: {
+    source: 'local',
+    external: [
       ...builtins,
       "microsite/server/fetch",
       "microsite/document",
diff --git a/packages/microsite/package.json b/packages/microsite/package.json
index 78d8cd0b..dd83b1e9 100644
--- a/packages/microsite/package.json
+++ b/packages/microsite/package.json
@@ -43,9 +43,8 @@
     "**/*.d.ts"
   ],
   "dependencies": {
-    "@prefresh/snowpack": "^3.0.0",
+    "@prefresh/snowpack": "^3.0.1",
     "@snowpack/plugin-dotenv": "^2.0.5",
-    "@snowpack/plugin-postcss": "^1.0.11",
     "arg": "^5.0.0",
     "cacache": "^15.0.5",
     "cosmiconfig": "^7.0.0",
@@ -58,17 +57,12 @@
     "open": "^7.3.0",
     "path-browserify": "^1.0.1",
     "polka": "^0.5.2",
-    "postcss": "^8.2.1",
-    "postcss-cli": "^8.3.1",
-    "postcss-flexbugs-fixes": "^5.0.2",
-    "postcss-preset-env": "^6.7.0",
     "preact": "^10.5.5",
     "preact-render-to-string": "5.1.11",
-    "prettier": "^2.1.2",
     "rollup": "^2.32.1",
     "rollup-plugin-styles": "^3.11.0",
     "sirv": "^1.0.10",
-    "snowpack": "^3.0.0-rc.2"
+    "snowpack": "^3.0.5"
   },
   "devDependencies": {
     "@types/node": "^12.19.0",
diff --git a/packages/microsite/src/cli/microsite-build.ts b/packages/microsite/src/cli/microsite-build.ts
index 23eff593..ca73ed94 100644
--- a/packages/microsite/src/cli/microsite-build.ts
+++ b/packages/microsite/src/cli/microsite-build.ts
@@ -1,4 +1,4 @@
-import { buildProject } from "snowpack";
+import { build as buildProject } from "snowpack";
 import { dirname, resolve } from "path";
 import glob from "globby";
 import arg from "arg";
@@ -61,15 +61,11 @@ export default async function build(
   let basePath = resolveNormalizedBasePath(args);
   setBasePath(basePath);
 
-  const [errs, config] = await loadConfiguration("build");
-  if (errs) {
-    errs.forEach((err) => console.error(err.message));
-    return;
-  }
+  const config = await loadConfiguration("build");
   const buildStart = performance.now();
   await Promise.all([
     prepare(),
-    buildProject({ config, cwd: process.cwd(), lockfile: null }),
+    buildProject({ config, lockfile: null }),
   ]);
 
   let pages = await glob(resolve(STAGING_DIR, "src/pages/**/*.js"));
@@ -289,7 +285,7 @@ async function bundlePagesForSSR(paths: string[]) {
      *
      * Components reused for multiple routes are placed in a shared chunk.
      *
-     * All code from 'web_modules' is placed in a vendor chunk.
+     * All code from '_snowpack/pkg' is placed in a vendor chunk.
      */
     manualChunks(id, { getModuleInfo }) {
       const info = getModuleInfo(id);
@@ -300,7 +296,7 @@ async function bundlePagesForSSR(paths: string[]) {
         // If we only import this module in global/index.js, inline to _global chunk
         if (/global\/index\.js$/.test(info.importers[0])) return `_hydrate/chunks/_vendor/global`;
       }
-      if (/web_modules/.test(info.id)) return `_hydrate/chunks/_vendor/index`;
+      if (/_snowpack\/pkg/.test(info.id)) return `_hydrate/chunks/_vendor/index`;
 
       const dependentStaticEntryPoints = [];
       const dependentHydrateEntryPoints = [];
diff --git a/packages/microsite/src/cli/microsite-dev.ts b/packages/microsite/src/cli/microsite-dev.ts
index dcfe6adf..ba25c566 100644
--- a/packages/microsite/src/cli/microsite-dev.ts
+++ b/packages/microsite/src/cli/microsite-dev.ts
@@ -1,4 +1,4 @@
-import { startDevServer } from "snowpack";
+import { startServer } from "snowpack";
 import arg from "arg";
 import { join, resolve, extname } from "path";
 import type { IncomingMessage, ServerResponse } from "http";
@@ -13,7 +13,7 @@ import { loadConfiguration } from "../utils/command.js";
 const pageScript = (
   page: string,
   props?: any
-) => `import { csr } from '/web_modules/microsite/client/csr.js';
+) => `import { csr } from '/_snowpack/pkg/microsite/client/csr.js';
 import Page from '${page}';
 csr("${page.replace(/\/src\/pages/, "").replace(/\.js$/, "")}", ${
   props ? `Page, ${JSON.stringify(props)}` : `Page`
@@ -21,8 +21,8 @@ csr("${page.replace(/\/src\/pages/, "").replace(/\.js$/, "")}", ${
 
 const errorScript = (
   props: any
-) => `import { h, render } from '/web_modules/preact.js';
-import Page from '/web_modules/microsite/error.js';
+) => `import { h, render } from '/_snowpack/pkg/preact.js';
+import Page from '/_snowpack/pkg/microsite/error.js';
 
 const root = document.querySelector('#__microsite');
 render(h(Page, ${JSON.stringify(props)}, null), root);`;
@@ -37,26 +37,28 @@ const globalScript = () => `(async () => {
     document.documentElement.style.removeProperty('visibility');
 })()`;
 
-const doc = (
+const doc = async (
   page: string,
   props?: any
-) => `<!DOCTYPE html>\n<!-- Generated by microsite -->\n<html lang="en" dir="ltr" style="visibility:hidden">\n\t<head></head>\n\t<body>
+) => {
+  return `<!DOCTYPE html>\n<!-- Generated by microsite -->\n<html lang="en" dir="ltr" style="visibility:hidden">\n\t<head></head>\n\t<body>
 \t\t<div id="__microsite"></div>
 \t\t<script data-csr="true">window.HMR_WEBSOCKET_URL = 'ws://localhost:3333';</script>
-\t\t<script type="module" src="/__snowpack__/hmr-client.js"></script>
+\t\t<script type="module" src="/_snowpack/hmr-client.js"></script>
 \t\t<script type="module" data-microsite="page">${pageScript(
   page,
   props
 )}</script>
 \t\t<script type="module" data-microsite="global">${globalScript()}</script>
-</body>\n</html>`;
+</body>\n</html>`
+};
 
 const errorPage = (
   props: any
 ) => `<!doctype html>\n<!-- Generated by microsite -->\n<html lang="en" dir="ltr">\n\t<head></head>\n\t<body>
 \t\t<div id="__microsite"></div>
 \t\t<script data-csr="true">window.HMR_WEBSOCKET_URL = 'ws://localhost:3333';</script>
-\t\t<script type="module" src="/__snowpack__/hmr-client.js"></script>
+\t\t<script type="module" src="/_snowpack/hmr-client.js"></script>
 \t\t<script type="module" data-microsite="page">${errorScript(props)}</script>
 \t\t<script type="module" data-microsite="global">${globalScript()}</script>`;
 
@@ -80,14 +82,9 @@ export default async function dev(argvOrParsedArgs: string[]|ReturnType<typeof p
   const args = Array.isArray(argvOrParsedArgs) ? parseArgs(argvOrParsedArgs) : argvOrParsedArgs;
   let PORT = args["--port"] ?? 8888;
 
-  const [errs, config] = await loadConfiguration('dev');
-  if (errs) {
-    errs.forEach((err) => console.error(err));
-    return;
-  }
-
-  const snowpack = await startDevServer({
-    cwd: process.cwd(),
+  const config = await loadConfiguration('dev');
+  
+  const snowpack = await startServer({
     config,
     lockfile: null,
   });
@@ -104,7 +101,7 @@ export default async function dev(argvOrParsedArgs: string[]|ReturnType<typeof p
     } catch (e) {}
 
     try {
-      const url = `/web_modules/microsite/error.js`;
+      const url = `/_snowpack/pkg/microsite/error.js`;
       const result = await snowpack.loadUrl(url);
       if (!result) throw new Error();
       if (contentType === "text/html") return errorPage(props);
@@ -168,7 +165,7 @@ export default async function dev(argvOrParsedArgs: string[]|ReturnType<typeof p
           if (!result) throw new Error();
 
           res.setHeader("Content-Type", "text/html");
-          res.end(doc(url));
+          res.end(await doc(url));
           return true;
         } catch (err) {
           // console.error(err);
@@ -232,8 +229,13 @@ export default async function dev(argvOrParsedArgs: string[]|ReturnType<typeof p
         const result = await snowpack.loadUrl(req.url);
         if (result.contentType)
           res.setHeader("Content-Type", result.contentType);
-
-        if (req.url.indexOf("/web_modules/microsite") === -1) {
+        
+        const MIME_EXCLUDE = ["image", "font"];
+        if (
+            req.url.indexOf("/_snowpack/pkg/microsite") === -1 &&
+            result.contentType &&
+            !MIME_EXCLUDE.includes(result.contentType.split("/")[0])
+        ) {
           result.contents = result.contents
             .toString()
             .replace(/preact\/hooks/, "microsite/client/hooks");
diff --git a/packages/microsite/src/document.tsx b/packages/microsite/src/document.tsx
index bebfce73..baba7db1 100644
--- a/packages/microsite/src/document.tsx
+++ b/packages/microsite/src/document.tsx
@@ -1,6 +1,6 @@
 import { h, createContext, Fragment, FunctionalComponent, JSX, ComponentType, ComponentProps } from "preact";
 import { useContext, useRef } from "preact/hooks";
-import { generateHydrateScript } from "./utils/hydration.js";
+import { generateHydrateScript } from "./utils/hydration";
 
 export const __HeadContext = createContext({
   head: { current: [] },
diff --git a/packages/microsite/src/utils/build.tsx b/packages/microsite/src/utils/build.tsx
index 5e4cde77..b8f8c2ae 100644
--- a/packages/microsite/src/utils/build.tsx
+++ b/packages/microsite/src/utils/build.tsx
@@ -9,7 +9,6 @@ const require = createRequire(import.meta.url);
 import { Document as InternalDocument, HeadProvider, __InternalDocContext } from "../document.js";
 import { h } from "preact";
 import { renderToString } from "preact-render-to-string";
-import prettier from "prettier";
 import { generateStaticPropsContext } from "./router.js";
 // import { createPrefetch, getCacheEntry, getPreviousKey } from "./prefetch.js";
 
@@ -184,10 +183,6 @@ export const renderPage = async (
 
   let contents = renderToString(<__InternalDocContext.Provider value={docContext}><Document {...(docProps as any)} /></__InternalDocContext.Provider>);
   contents = contents.replace(/<hydrate-marker>(\?h[\s\S]*?\?)<\/hydrate-marker>/g, '<$1>\n');
-  contents = prettier.format(contents, {
-    parser: "html",
-    embeddedLanguageFormatting: "off",
-  });
   contents = '<!DOCTYPE html>\n<!-- Generated by microsite -->\n' + contents;
 
   return {
diff --git a/packages/microsite/src/utils/command.ts b/packages/microsite/src/utils/command.ts
index ece9f150..09af1ee4 100644
--- a/packages/microsite/src/utils/command.ts
+++ b/packages/microsite/src/utils/command.ts
@@ -6,6 +6,7 @@ const require = createRequire(import.meta.url);
 import { fileExists } from "./fs.js";
 import { createConfiguration } from "snowpack";
 import cc from "cosmiconfig";
+import { yellow } from "kleur/colors";
 const { cosmiconfig } = cc;
 const _config = require("microsite/assets/snowpack.config.cjs");
 
@@ -39,7 +40,22 @@ export async function loadConfiguration(mode: "dev" | "build") {
     ? resolveTsconfigPathsToAlias({ tsconfigPath })
     : {};
   const userConfig = snowpackconfigPath ? require(snowpackconfigPath) : {};
-
+  
+  if (usesPostCSS) {
+    const missing = [];
+    const deps = ['@snowpack/plugin-postcss', 'postcss', 'postcss-cli'];
+    deps.forEach(dependency => {
+      try {
+        require.resolve(dependency);
+      } catch (e) {
+        missing.push(dependency);
+      }
+    });
+    if (missing.length > 0) {
+      console.error(yellow(`It looks like you're trying to use PostCSS!\nMicrosite will automatically use your configuration, but requires some 'devDependencies' to do so.\n\nPlease run 'npm install --save-dev ${missing.join(' ')}'\n`));
+      process.exit(1);
+    }
+  }
   const additionalPlugins = usesPostCSS ? ["@snowpack/plugin-postcss"] : [];
 
   switch (mode) {
@@ -47,6 +63,11 @@ export async function loadConfiguration(mode: "dev" | "build") {
       return createConfiguration({
         ...userConfig,
         ..._config,
+        buildOptions: {
+          ...userConfig.buildOptions,
+          ..._config.buildOptions,
+          ssr: true
+        },
         plugins: [...additionalPlugins, ..._config.plugins, ...(userConfig.plugins ?? [])],
         alias: {
           ...(userConfig.aliases ?? {}),
@@ -54,25 +75,32 @@ export async function loadConfiguration(mode: "dev" | "build") {
           ...(_config.alias ?? {}),
           "microsite/hydrate": "microsite/client/hydrate",
         },
-        installOptions: {
-          ...(userConfig.installOptions ?? {}),
-          ..._config.installOptions,
-          externalPackage: ["/web_modules/microsite/_error.js"],
+        packageOptions: {
+          ..._config.packageOptions,
+          external: ["/web_modules/microsite/_error.js"],
         },
       });
     case "build":
       return createConfiguration({
         ...userConfig,
         ..._config,
+        buildOptions: {
+          ...userConfig.buildOptions,
+          ..._config.buildOptions,
+          ssr: true
+        },
         plugins: [...additionalPlugins, ..._config.plugins, ...(userConfig.plugins ?? [])],
         alias: {
           ...(userConfig.aliases ?? {}),
           ...aliases,
           ...(_config.alias ?? {}),
         },
-        installOptions: {
-          ...(userConfig.installOptions ?? {}),
-          ..._config.installOptions,
+        packageOptions: {
+          ..._config.packageOptions,
+          external: [
+            ...(userConfig.packageOptions?.external ?? []),
+            ..._config.packageOptions.external,
+          ].filter((v) => v !== "preact"),
           rollup: {
             ...(userConfig.installOptions?.rollup ?? {}),
             ...(_config.installOptions?.rollup ?? {}),
@@ -85,11 +113,7 @@ export async function loadConfiguration(mode: "dev" | "build") {
                 }
               }
             ],
-          },
-          externalPackage: [
-            ...(userConfig.installOptions?.externalPackage ?? []),
-            ..._config.installOptions.externalPackage,
-          ].filter((v) => v !== "preact"),
+          }
         },
       });
   }
diff --git a/packages/microsite/test/_fixtures/env.ts b/packages/microsite/test/_fixtures/env.ts
new file mode 100644
index 00000000..236894d8
--- /dev/null
+++ b/packages/microsite/test/_fixtures/env.ts
@@ -0,0 +1,48 @@
+import { JSDOM } from 'jsdom';
+import * as Preact from 'preact';
+import { act } from 'preact/test-utils';
+
+const { window } = new JSDOM('<main></main>');
+
+export function setup() {
+	// @ts-ignore
+	global.window = window;
+	global.document = window.document;
+	global.navigator = window.navigator;
+	global.getComputedStyle = window.getComputedStyle;
+	global.requestAnimationFrame = null;
+}
+
+export function reset() {
+	window.document.title = '';
+	window.document.head.innerHTML = '';
+	window.document.body.innerHTML = '<main></main>';
+}
+
+/**
+ * @typedef RenderOutput
+ * @property container {HTMLElement}
+ * @property component {Preact.VNode}
+ */
+
+/**
+ * @return {RenderOutput}
+ */
+export function render(Tag, props = {}) {
+	const container = window.document.querySelector('main');
+	const component = Preact.h(Tag, props);
+	Preact.render(component, container)
+	return { container, component };
+}
+
+/**
+ * @param {HTMLElement} elem
+ * @param {String} event
+ * @param {any} [details]
+ */
+export async function fire(elem, event, details) {
+	await act(() => {
+		let evt = new window.Event(event, details);
+		elem.dispatchEvent(evt);
+	});
+}
diff --git a/packages/microsite/test/document.ts b/packages/microsite/test/document.ts
new file mode 100644
index 00000000..ab34269e
--- /dev/null
+++ b/packages/microsite/test/document.ts
@@ -0,0 +1,20 @@
+import { suite } from 'uvu';
+import * as assert from 'uvu/assert';
+import * as ENV from './_fixtures/env';
+import { Document } from '../src/document';
+
+
+const component = suite('Component');
+component.before(ENV.setup);
+component.before.each(ENV.reset);
+
+component('should render a basic HTML document', () => {
+	const { container } = ENV.render(Document, {});
+
+	assert.snapshot(
+		container.innerHTML,
+		`<html lang="en" dir="ltr"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=5.0"><base href="/"></head><body><div id="__microsite"></div></body></html>`
+	);
+});
+
+component.run();
diff --git a/packages/microsite/test/utils/fs.ts b/packages/microsite/test/utils/fs.ts
new file mode 100644
index 00000000..32deaa17
--- /dev/null
+++ b/packages/microsite/test/utils/fs.ts
@@ -0,0 +1,18 @@
+import { suite } from 'uvu';
+import * as assert from 'uvu/assert';
+import { fileExists } from '../../src/utils/fs';
+
+import { resolve } from 'path';
+
+
+const exists = suite('fileExists');
+
+exists('should be a function', () => {
+	assert.type(fileExists, 'function');
+});
+
+exists('should return true', async () => {
+  assert.is(await fileExists(resolve(__dirname, '../../package.json')), true);
+});
+
+exists.run();
diff --git a/tsconfig.test.json b/tsconfig.test.json
new file mode 100644
index 00000000..1e606c32
--- /dev/null
+++ b/tsconfig.test.json
@@ -0,0 +1,14 @@
+{
+    "compilerOptions": {
+      "module": "esnext",
+      "target": "esnext",
+      "moduleResolution": "node",
+      "jsx": "react",
+      "jsxFactory": "h",
+      "jsxFragmentFactory": "Fragment",
+    },
+    "include": [
+      "**/test/**/*",
+      "**/src/**/*"
+    ]
+}