From c31b6fb867d4bfb1498251882f73f97d1ba462be Mon Sep 17 00:00:00 2001
From: Riad Benguella <benguella@gmail.com>
Date: Mon, 18 Mar 2019 16:01:02 +0100
Subject: [PATCH 1/9] Try implementing a built-in Gutenberg playground

---
 .babelrc                  |    3 +
 .gitignore                |    3 +
 package-lock.json         | 1540 ++++++++++++++++++++++++++++++++++++-
 package.json              |    5 +-
 playground/src/index.html |   12 +
 playground/src/index.js   |   53 ++
 6 files changed, 1601 insertions(+), 15 deletions(-)
 create mode 100644 .babelrc
 create mode 100644 playground/src/index.html
 create mode 100644 playground/src/index.js

diff --git a/.babelrc b/.babelrc
new file mode 100644
index 0000000000000..8a1e754e7fba1
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,3 @@
+{
+	"presets": ["@wordpress/babel-preset-default"]
+}
diff --git a/.gitignore b/.gitignore
index 2fb814f9616e0..3ad35285fa658 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,6 @@ phpcs.xml
 yarn.lock
 docker-compose.override.yml
 /wordpress
+
+playground/dist
+.cache
diff --git a/package-lock.json b/package-lock.json
index d8bc6f6abec6f..54f0c8900e24e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -371,6 +371,15 @@
 				"@babel/helper-plugin-utils": "^7.0.0"
 			}
 		},
+		"@babel/plugin-syntax-flow": {
+			"version": "7.2.0",
+			"resolved": "https://registry.npmjs.org/@babel/plugin-syntax-flow/-/plugin-syntax-flow-7.2.0.tgz",
+			"integrity": "sha512-r6YMuZDWLtLlu0kqIim5o/3TNRAlWb073HwT3e2nKf9I8IIvOggPrnILYPsrrKilmn/mYEMCf/Z07w3yQJF6dg==",
+			"dev": true,
+			"requires": {
+				"@babel/helper-plugin-utils": "^7.0.0"
+			}
+		},
 		"@babel/plugin-syntax-json-strings": {
 			"version": "7.2.0",
 			"resolved": "https://registry.npmjs.org/@babel/plugin-syntax-json-strings/-/plugin-syntax-json-strings-7.2.0.tgz",
@@ -510,6 +519,16 @@
 				"@babel/helper-plugin-utils": "^7.0.0"
 			}
 		},
+		"@babel/plugin-transform-flow-strip-types": {
+			"version": "7.3.4",
+			"resolved": "https://registry.npmjs.org/@babel/plugin-transform-flow-strip-types/-/plugin-transform-flow-strip-types-7.3.4.tgz",
+			"integrity": "sha512-PmQC9R7DwpBFA+7ATKMyzViz3zCaMNouzZMPZN2K5PnbBbtL3AXFYTkDk+Hey5crQq2A90UG5Uthz0mel+XZrA==",
+			"dev": true,
+			"requires": {
+				"@babel/helper-plugin-utils": "^7.0.0",
+				"@babel/plugin-syntax-flow": "^7.2.0"
+			}
+		},
 		"@babel/plugin-transform-for-of": {
 			"version": "7.2.0",
 			"resolved": "https://registry.npmjs.org/@babel/plugin-transform-for-of/-/plugin-transform-for-of-7.2.0.tgz",
@@ -841,6 +860,12 @@
 				"to-fast-properties": "^2.0.0"
 			}
 		},
+		"@iarna/toml": {
+			"version": "2.2.3",
+			"resolved": "https://registry.npmjs.org/@iarna/toml/-/toml-2.2.3.tgz",
+			"integrity": "sha512-FmuxfCuolpLl0AnQ2NHSzoUKWEJDFl63qXjzdoWBVyFCXzMGm1spBzk7LeHNoVCiWCF7mRVms9e6jEV9+MoPbg==",
+			"dev": true
+		},
 		"@lerna/add": {
 			"version": "3.11.0",
 			"resolved": "https://registry.npmjs.org/@lerna/add/-/add-3.11.0.tgz",
@@ -2151,6 +2176,56 @@
 				"url-template": "^2.0.8"
 			}
 		},
+		"@parcel/fs": {
+			"version": "1.11.0",
+			"resolved": "https://registry.npmjs.org/@parcel/fs/-/fs-1.11.0.tgz",
+			"integrity": "sha512-86RyEqULbbVoeo8OLcv+LQ1Vq2PKBAvWTU9fCgALxuCTbbs5Ppcvll4Vr+Ko1AnmMzja/k++SzNAwJfeQXVlpA==",
+			"dev": true,
+			"requires": {
+				"@parcel/utils": "^1.11.0",
+				"mkdirp": "^0.5.1",
+				"rimraf": "^2.6.2"
+			}
+		},
+		"@parcel/logger": {
+			"version": "1.11.0",
+			"resolved": "https://registry.npmjs.org/@parcel/logger/-/logger-1.11.0.tgz",
+			"integrity": "sha512-lIRfDg+junbFUUeU0QtHX00gKCgEsYHZydFKwrJ8dc0D+WE2SYT1FcVCgpPAfKYgtg0QQMns8E9vzT9UjH92PQ==",
+			"dev": true,
+			"requires": {
+				"@parcel/workers": "^1.11.0",
+				"chalk": "^2.1.0",
+				"grapheme-breaker": "^0.3.2",
+				"ora": "^2.1.0",
+				"strip-ansi": "^4.0.0"
+			}
+		},
+		"@parcel/utils": {
+			"version": "1.11.0",
+			"resolved": "https://registry.npmjs.org/@parcel/utils/-/utils-1.11.0.tgz",
+			"integrity": "sha512-cA3p4jTlaMeOtAKR/6AadanOPvKeg8VwgnHhOyfi0yClD0TZS/hi9xu12w4EzA/8NtHu0g6o4RDfcNjqN8l1AQ==",
+			"dev": true
+		},
+		"@parcel/watcher": {
+			"version": "1.12.0",
+			"resolved": "https://registry.npmjs.org/@parcel/watcher/-/watcher-1.12.0.tgz",
+			"integrity": "sha512-yijGiAqG7Tjf5WnFwOkiNWwerfZQDNABldiiqRDtr7vDWLO+F/DIncyB7tTcaD5Loevrr5mzzGo8Ntf3d2GIPg==",
+			"dev": true,
+			"requires": {
+				"@parcel/utils": "^1.11.0",
+				"chokidar": "^2.0.3"
+			}
+		},
+		"@parcel/workers": {
+			"version": "1.11.0",
+			"resolved": "https://registry.npmjs.org/@parcel/workers/-/workers-1.11.0.tgz",
+			"integrity": "sha512-USSjRAAQYsZFlv43FUPdD+jEGML5/8oLF0rUzPQTtK4q9kvaXr49F5ZplyLz5lox78cLZ0TxN2bIDQ1xhOkulQ==",
+			"dev": true,
+			"requires": {
+				"@parcel/utils": "^1.11.0",
+				"physical-cpu-count": "^2.0.0"
+			}
+		},
 		"@romainberger/css-diff": {
 			"version": "1.0.3",
 			"resolved": "https://registry.npmjs.org/@romainberger/css-diff/-/css-diff-1.0.3.tgz",
@@ -3255,6 +3330,15 @@
 				"color-convert": "^1.9.0"
 			}
 		},
+		"ansi-to-html": {
+			"version": "0.6.10",
+			"resolved": "https://registry.npmjs.org/ansi-to-html/-/ansi-to-html-0.6.10.tgz",
+			"integrity": "sha512-znsY3gvsk4CiApWu1yVYF8Nx5Vy0FEe8B0YwyxdbCdErJu5lfKlRHB2twtUjR+dxR4WewTk2OP8XqTmWYnImOg==",
+			"dev": true,
+			"requires": {
+				"entities": "^1.1.1"
+			}
+		},
 		"any-observable": {
 			"version": "0.3.0",
 			"resolved": "https://registry.npmjs.org/any-observable/-/any-observable-0.3.0.tgz",
@@ -3982,6 +4066,55 @@
 				}
 			}
 		},
+		"babel-runtime": {
+			"version": "6.26.0",
+			"resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+			"integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+			"dev": true,
+			"requires": {
+				"core-js": "^2.4.0",
+				"regenerator-runtime": "^0.11.0"
+			},
+			"dependencies": {
+				"regenerator-runtime": {
+					"version": "0.11.1",
+					"resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz",
+					"integrity": "sha512-MguG95oij0fC3QV3URf4V2SDYGJhJnJGqvIIgdECeODCT98wSWDAJ94SSuVpYQUoTcGUIL6L4yNB7j1DFFHSBg==",
+					"dev": true
+				}
+			}
+		},
+		"babel-types": {
+			"version": "6.26.0",
+			"resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
+			"integrity": "sha1-o7Bz+Uq0nrb6Vc1lInozQ4BjJJc=",
+			"dev": true,
+			"requires": {
+				"babel-runtime": "^6.26.0",
+				"esutils": "^2.0.2",
+				"lodash": "^4.17.4",
+				"to-fast-properties": "^1.0.3"
+			},
+			"dependencies": {
+				"to-fast-properties": {
+					"version": "1.0.3",
+					"resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-1.0.3.tgz",
+					"integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc=",
+					"dev": true
+				}
+			}
+		},
+		"babylon-walk": {
+			"version": "1.0.2",
+			"resolved": "https://registry.npmjs.org/babylon-walk/-/babylon-walk-1.0.2.tgz",
+			"integrity": "sha1-OxWl3btIKni0zpwByLoYFwLZ1s4=",
+			"dev": true,
+			"requires": {
+				"babel-runtime": "^6.11.6",
+				"babel-types": "^6.15.0",
+				"lodash.clone": "^4.5.0"
+			}
+		},
 		"bail": {
 			"version": "1.0.3",
 			"resolved": "https://registry.npmjs.org/bail/-/bail-1.0.3.tgz",
@@ -4279,6 +4412,18 @@
 			"resolved": "https://registry.npmjs.org/brcast/-/brcast-2.0.2.tgz",
 			"integrity": "sha512-Tfn5JSE7hrUlFcOoaLzVvkbgIemIorMIyoMr3TgvszWW7jFt2C9PdeMLtysYD9RU0MmU17b69+XJG1eRY2OBRg=="
 		},
+		"brfs": {
+			"version": "1.6.1",
+			"resolved": "https://registry.npmjs.org/brfs/-/brfs-1.6.1.tgz",
+			"integrity": "sha512-OfZpABRQQf+Xsmju8XE9bDjs+uU4vLREGolP7bDgcpsI17QREyZ4Bl+2KLxxx1kCgA0fAIhKQBaBYh+PEcCqYQ==",
+			"dev": true,
+			"requires": {
+				"quote-stream": "^1.0.1",
+				"resolve": "^1.1.5",
+				"static-module": "^2.2.0",
+				"through2": "^2.0.0"
+			}
+		},
 		"brorand": {
 			"version": "1.1.0",
 			"resolved": "https://registry.npmjs.org/brorand/-/brorand-1.1.0.tgz",
@@ -4439,6 +4584,12 @@
 				"isarray": "^1.0.0"
 			}
 		},
+		"buffer-equal": {
+			"version": "0.0.1",
+			"resolved": "https://registry.npmjs.org/buffer-equal/-/buffer-equal-0.0.1.tgz",
+			"integrity": "sha1-kbx0sR6kBbyRa8aqkI+q+ltKrEs=",
+			"dev": true
+		},
 		"buffer-from": {
 			"version": "1.1.0",
 			"resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.0.tgz",
@@ -5447,6 +5598,12 @@
 				"restore-cursor": "^2.0.0"
 			}
 		},
+		"cli-spinners": {
+			"version": "1.3.1",
+			"resolved": "https://registry.npmjs.org/cli-spinners/-/cli-spinners-1.3.1.tgz",
+			"integrity": "sha512-1QL4544moEsDVH9T/l6Cemov/37iv1RtoKf7NJ04A60+4MREXNfx/QvavbH6QoGdsD4N4Mwy49cmaINR/o2mdg==",
+			"dev": true
+		},
 		"cli-table3": {
 			"version": "0.5.1",
 			"resolved": "https://registry.npmjs.org/cli-table3/-/cli-table3-0.5.1.tgz",
@@ -5585,6 +5742,12 @@
 				"is-supported-regexp-flag": "^1.0.0"
 			}
 		},
+		"clones": {
+			"version": "1.2.0",
+			"resolved": "https://registry.npmjs.org/clones/-/clones-1.2.0.tgz",
+			"integrity": "sha512-FXDYw4TjR8wgPZYui2LeTqWh1BLpfQ8lB6upMtlpDF6WlOOxghmTTxWyngdKTgozqBgKnHbTVwTE+hOHqAykuQ==",
+			"dev": true
+		},
 		"cmd-shim": {
 			"version": "2.0.2",
 			"resolved": "https://registry.npmjs.org/cmd-shim/-/cmd-shim-2.0.2.tgz",
@@ -5719,6 +5882,12 @@
 				"delayed-stream": "~1.0.0"
 			}
 		},
+		"command-exists": {
+			"version": "1.2.8",
+			"resolved": "https://registry.npmjs.org/command-exists/-/command-exists-1.2.8.tgz",
+			"integrity": "sha512-PM54PkseWbiiD/mMsbvW351/u+dafwTJ0ye2qB60G1aGQP9j3xK2gmMDc+R34L3nDtx4qMCitXT75mkbkGJDLw==",
+			"dev": true
+		},
 		"commander": {
 			"version": "2.16.0",
 			"resolved": "https://registry.npmjs.org/commander/-/commander-2.16.0.tgz",
@@ -6592,6 +6761,90 @@
 				}
 			}
 		},
+		"css-modules-loader-core": {
+			"version": "1.1.0",
+			"resolved": "https://registry.npmjs.org/css-modules-loader-core/-/css-modules-loader-core-1.1.0.tgz",
+			"integrity": "sha1-WQhmgpShvs0mGuCkziGwtVHyHRY=",
+			"dev": true,
+			"requires": {
+				"icss-replace-symbols": "1.1.0",
+				"postcss": "6.0.1",
+				"postcss-modules-extract-imports": "1.1.0",
+				"postcss-modules-local-by-default": "1.2.0",
+				"postcss-modules-scope": "1.1.0",
+				"postcss-modules-values": "1.3.0"
+			},
+			"dependencies": {
+				"ansi-regex": {
+					"version": "2.1.1",
+					"resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+					"integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+					"dev": true
+				},
+				"ansi-styles": {
+					"version": "2.2.1",
+					"resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+					"integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+					"dev": true
+				},
+				"chalk": {
+					"version": "1.1.3",
+					"resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+					"integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+					"dev": true,
+					"requires": {
+						"ansi-styles": "^2.2.1",
+						"escape-string-regexp": "^1.0.2",
+						"has-ansi": "^2.0.0",
+						"strip-ansi": "^3.0.0",
+						"supports-color": "^2.0.0"
+					},
+					"dependencies": {
+						"supports-color": {
+							"version": "2.0.0",
+							"resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+							"integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+							"dev": true
+						}
+					}
+				},
+				"has-flag": {
+					"version": "1.0.0",
+					"resolved": "https://registry.npmjs.org/has-flag/-/has-flag-1.0.0.tgz",
+					"integrity": "sha1-nZ55MWXOAXoA8AQYxD+UKnsdEfo=",
+					"dev": true
+				},
+				"postcss": {
+					"version": "6.0.1",
+					"resolved": "https://registry.npmjs.org/postcss/-/postcss-6.0.1.tgz",
+					"integrity": "sha1-AA29H47vIXqjaLmiEsX8QLKo8/I=",
+					"dev": true,
+					"requires": {
+						"chalk": "^1.1.3",
+						"source-map": "^0.5.6",
+						"supports-color": "^3.2.3"
+					}
+				},
+				"strip-ansi": {
+					"version": "3.0.1",
+					"resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+					"integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+					"dev": true,
+					"requires": {
+						"ansi-regex": "^2.0.0"
+					}
+				},
+				"supports-color": {
+					"version": "3.2.3",
+					"resolved": "https://registry.npmjs.org/supports-color/-/supports-color-3.2.3.tgz",
+					"integrity": "sha1-ZawFBLOVQXHYpklGsq48u4pfVPY=",
+					"dev": true,
+					"requires": {
+						"has-flag": "^1.0.0"
+					}
+				}
+			}
+		},
 		"css-select": {
 			"version": "1.2.0",
 			"resolved": "https://registry.npmjs.org/css-select/-/css-select-1.2.0.tgz",
@@ -6610,6 +6863,57 @@
 			"integrity": "sha1-AQKz0UYw34bD65+p9UVicBBs+ZA=",
 			"dev": true
 		},
+		"css-selector-tokenizer": {
+			"version": "0.7.1",
+			"resolved": "https://registry.npmjs.org/css-selector-tokenizer/-/css-selector-tokenizer-0.7.1.tgz",
+			"integrity": "sha512-xYL0AMZJ4gFzJQsHUKa5jiWWi2vH77WVNg7JYRyewwj6oPh4yb/y6Y9ZCw9dsj/9UauMhtuxR+ogQd//EdEVNA==",
+			"dev": true,
+			"requires": {
+				"cssesc": "^0.1.0",
+				"fastparse": "^1.1.1",
+				"regexpu-core": "^1.0.0"
+			},
+			"dependencies": {
+				"cssesc": {
+					"version": "0.1.0",
+					"resolved": "https://registry.npmjs.org/cssesc/-/cssesc-0.1.0.tgz",
+					"integrity": "sha1-yBSQPkViM3GgR3tAEJqq++6t27Q=",
+					"dev": true
+				},
+				"jsesc": {
+					"version": "0.5.0",
+					"resolved": "https://registry.npmjs.org/jsesc/-/jsesc-0.5.0.tgz",
+					"integrity": "sha1-597mbjXW/Bb3EP6R1c9p9w8IkR0=",
+					"dev": true
+				},
+				"regexpu-core": {
+					"version": "1.0.0",
+					"resolved": "https://registry.npmjs.org/regexpu-core/-/regexpu-core-1.0.0.tgz",
+					"integrity": "sha1-hqdj9Y7k18L2sQLkdkBQ3n7ZDGs=",
+					"dev": true,
+					"requires": {
+						"regenerate": "^1.2.1",
+						"regjsgen": "^0.2.0",
+						"regjsparser": "^0.1.4"
+					}
+				},
+				"regjsgen": {
+					"version": "0.2.0",
+					"resolved": "https://registry.npmjs.org/regjsgen/-/regjsgen-0.2.0.tgz",
+					"integrity": "sha1-bAFq3qxVT3WCP+N6wFuS1aTtsfc=",
+					"dev": true
+				},
+				"regjsparser": {
+					"version": "0.1.5",
+					"resolved": "https://registry.npmjs.org/regjsparser/-/regjsparser-0.1.5.tgz",
+					"integrity": "sha1-fuj4Tcb6eS0/0K4ijSS9lJ6tIFw=",
+					"dev": true,
+					"requires": {
+						"jsesc": "~0.5.0"
+					}
+				}
+			}
+		},
 		"css-tree": {
 			"version": "1.0.0-alpha25",
 			"resolved": "https://registry.npmjs.org/css-tree/-/css-tree-1.0.0-alpha25.tgz",
@@ -7221,12 +7525,33 @@
 				"is-obj": "^1.0.0"
 			}
 		},
+		"dotenv": {
+			"version": "5.0.1",
+			"resolved": "https://registry.npmjs.org/dotenv/-/dotenv-5.0.1.tgz",
+			"integrity": "sha512-4As8uPrjfwb7VXC+WnLCbXK7y+Ueb2B3zgNCePYfhxS1PYeaO1YTeplffTEcbfLhvFNGLAz90VvJs9yomG7bow==",
+			"dev": true
+		},
+		"dotenv-expand": {
+			"version": "4.2.0",
+			"resolved": "https://registry.npmjs.org/dotenv-expand/-/dotenv-expand-4.2.0.tgz",
+			"integrity": "sha1-3vHxyl1gWdJKdm5YeULCEQbOEnU=",
+			"dev": true
+		},
 		"duplexer": {
 			"version": "0.1.1",
 			"resolved": "https://registry.npmjs.org/duplexer/-/duplexer-0.1.1.tgz",
 			"integrity": "sha1-rOb/gIwc5mtX0ev5eXessCM0z8E=",
 			"dev": true
 		},
+		"duplexer2": {
+			"version": "0.1.4",
+			"resolved": "https://registry.npmjs.org/duplexer2/-/duplexer2-0.1.4.tgz",
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+			"version": "1.0.1",
+			"resolved": "https://registry.npmjs.org/sigmund/-/sigmund-1.0.1.tgz",
+			"integrity": "sha1-P/IfGYytIXX587eBhT/ZTQ0ZtZA=",
+			"dev": true
+		},
 		"signal-exit": {
 			"version": "3.0.2",
 			"resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
@@ -19840,6 +21185,15 @@
 			"integrity": "sha512-Qe8QntFrrpWTnHwvwj2FZTgv+PKIsp0B9VxLzLLbSpPXWOgRgc5LVj/aTiSfK1RqIeF9jeC1UeOH8Q8y60A7og==",
 			"dev": true
 		},
+		"static-eval": {
+			"version": "2.0.2",
+			"resolved": "https://registry.npmjs.org/static-eval/-/static-eval-2.0.2.tgz",
+			"integrity": "sha512-N/D219Hcr2bPjLxPiV+TQE++Tsmrady7TqAJugLy7Xk1EumfDWS/f5dtBbkRCGE7wKKXuYockQoj8Rm2/pVKyg==",
+			"dev": true,
+			"requires": {
+				"escodegen": "^1.8.1"
+			}
+		},
 		"static-extend": {
 			"version": "0.1.2",
 			"resolved": "https://registry.npmjs.org/static-extend/-/static-extend-0.1.2.tgz",
@@ -19861,6 +21215,56 @@
 				}
 			}
 		},
+		"static-module": {
+			"version": "2.2.5",
+			"resolved": "https://registry.npmjs.org/static-module/-/static-module-2.2.5.tgz",
+			"integrity": "sha512-D8vv82E/Kpmz3TXHKG8PPsCPg+RAX6cbCOyvjM6x04qZtQ47EtJFVwRsdov3n5d6/6ynrOY9XB4JkaZwB2xoRQ==",
+			"dev": true,
+			"requires": {
+				"concat-stream": "~1.6.0",
+				"convert-source-map": "^1.5.1",
+				"duplexer2": "~0.1.4",
+				"escodegen": "~1.9.0",
+				"falafel": "^2.1.0",
+				"has": "^1.0.1",
+				"magic-string": "^0.22.4",
+				"merge-source-map": "1.0.4",
+				"object-inspect": "~1.4.0",
+				"quote-stream": "~1.0.2",
+				"readable-stream": "~2.3.3",
+				"shallow-copy": "~0.0.1",
+				"static-eval": "^2.0.0",
+				"through2": "~2.0.3"
+			},
+			"dependencies": {
+				"escodegen": {
+					"version": "1.9.1",
+					"resolved": "https://registry.npmjs.org/escodegen/-/escodegen-1.9.1.tgz",
+					"integrity": "sha512-6hTjO1NAWkHnDk3OqQ4YrCuwwmGHL9S3nPlzBOUG/R44rda3wLNrfvQ5fkSGjyhHFKM7ALPKcKGrwvCLe0lC7Q==",
+					"dev": true,
+					"requires": {
+						"esprima": "^3.1.3",
+						"estraverse": "^4.2.0",
+						"esutils": "^2.0.2",
+						"optionator": "^0.8.1",
+						"source-map": "~0.6.1"
+					}
+				},
+				"object-inspect": {
+					"version": "1.4.1",
+					"resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.4.1.tgz",
+					"integrity": "sha512-wqdhLpfCUbEsoEwl3FXwGyv8ief1k/1aUdIPCqVnupM6e8l63BEJdiF/0swtn04/8p05tG/T0FrpTlfwvljOdw==",
+					"dev": true
+				},
+				"source-map": {
+					"version": "0.6.1",
+					"resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+					"integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+					"dev": true,
+					"optional": true
+				}
+			}
+		},
 		"statuses": {
 			"version": "1.4.0",
 			"resolved": "https://registry.npmjs.org/statuses/-/statuses-1.4.0.tgz",
@@ -20671,6 +22075,31 @@
 				}
 			}
 		},
+		"terser": {
+			"version": "3.17.0",
+			"resolved": "https://registry.npmjs.org/terser/-/terser-3.17.0.tgz",
+			"integrity": "sha512-/FQzzPJmCpjAH9Xvk2paiWrFq+5M6aVOf+2KRbwhByISDX/EujxsK+BAvrhb6H+2rtrLCHK9N01wO014vrIwVQ==",
+			"dev": true,
+			"requires": {
+				"commander": "^2.19.0",
+				"source-map": "~0.6.1",
+				"source-map-support": "~0.5.10"
+			},
+			"dependencies": {
+				"commander": {
+					"version": "2.19.0",
+					"resolved": "https://registry.npmjs.org/commander/-/commander-2.19.0.tgz",
+					"integrity": "sha512-6tvAOO+D6OENvRAh524Dh9jcfKTYDQAqvqezbCW82xj5X0pSrcpxtvRKHLG0yBY6SD7PSDrJaj+0AiOcKVd1Xg==",
+					"dev": true
+				},
+				"source-map": {
+					"version": "0.6.1",
+					"resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+					"integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+					"dev": true
+				}
+			}
+		},
 		"text-extensions": {
 			"version": "1.9.0",
 			"resolved": "https://registry.npmjs.org/text-extensions/-/text-extensions-1.9.0.tgz",
@@ -20725,6 +22154,12 @@
 			"resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.0.2.tgz",
 			"integrity": "sha512-2NM0auVBGft5tee/OxP4PI3d8WItkDM+fPnaRAVo6xTDI2knbz9eC5ArWGqtGlYqiH3RU5yMpdyTTO7MguC4ow=="
 		},
+		"tiny-inflate": {
+			"version": "1.0.2",
+			"resolved": "https://registry.npmjs.org/tiny-inflate/-/tiny-inflate-1.0.2.tgz",
+			"integrity": "sha1-k9nez/yIBb1X6uQxDwt0Xptvs6c=",
+			"dev": true
+		},
 		"tiny-lr": {
 			"version": "1.1.1",
 			"resolved": "https://registry.npmjs.org/tiny-lr/-/tiny-lr-1.1.1.tgz",
@@ -21044,6 +22479,53 @@
 			"integrity": "sha1-8pzr8B31F5ErtY/5xOUP3o4zMg0=",
 			"dev": true
 		},
+		"uncss": {
+			"version": "0.16.2",
+			"resolved": "https://registry.npmjs.org/uncss/-/uncss-0.16.2.tgz",
+			"integrity": "sha1-OyJpxZAS2nxmy+mPvt3e75TwZJw=",
+			"dev": true,
+			"requires": {
+				"commander": "^2.9.0",
+				"glob": "^7.0.3",
+				"is-absolute-url": "^2.0.0",
+				"is-html": "^1.0.0",
+				"jsdom": "^11.3.0",
+				"lodash": "^4.13.1",
+				"postcss": "^6.0.14",
+				"postcss-selector-parser": "3.1.1",
+				"request": "^2.72.0"
+			},
+			"dependencies": {
+				"postcss": {
+					"version": "6.0.23",
+					"resolved": "https://registry.npmjs.org/postcss/-/postcss-6.0.23.tgz",
+					"integrity": "sha512-soOk1h6J3VMTZtVeVpv15/Hpdl2cBLX3CAw4TAbkpTJiNPk9YP/zWcD1ND+xEtvyuuvKzbxliTOIyvkSeSJ6ag==",
+					"dev": true,
+					"requires": {
+						"chalk": "^2.4.1",
+						"source-map": "^0.6.1",
+						"supports-color": "^5.4.0"
+					}
+				},
+				"postcss-selector-parser": {
+					"version": "3.1.1",
+					"resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-3.1.1.tgz",
+					"integrity": "sha1-T4dfSvsMllc9XPTXQBGu4lCn6GU=",
+					"dev": true,
+					"requires": {
+						"dot-prop": "^4.1.1",
+						"indexes-of": "^1.0.1",
+						"uniq": "^1.0.1"
+					}
+				},
+				"source-map": {
+					"version": "0.6.1",
+					"resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+					"integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+					"dev": true
+				}
+			}
+		},
 		"underscore": {
 			"version": "1.4.4",
 			"resolved": "https://registry.npmjs.org/underscore/-/underscore-1.4.4.tgz",
@@ -21088,6 +22570,24 @@
 			"integrity": "sha512-2WSLa6OdYd2ng8oqiGIWnJqyFArvhn+5vgx5GTxMbUYjCYKUcuKS62YLFF0R/BDGlB1yzXjQOLtPAfHsgirEpg==",
 			"dev": true
 		},
+		"unicode-trie": {
+			"version": "0.3.1",
+			"resolved": "https://registry.npmjs.org/unicode-trie/-/unicode-trie-0.3.1.tgz",
+			"integrity": "sha1-1nHd3YkQGgi6w3tqUWEBBgIFIIU=",
+			"dev": true,
+			"requires": {
+				"pako": "^0.2.5",
+				"tiny-inflate": "^1.0.0"
+			},
+			"dependencies": {
+				"pako": {
+					"version": "0.2.9",
+					"resolved": "https://registry.npmjs.org/pako/-/pako-0.2.9.tgz",
+					"integrity": "sha1-8/dSL073gjSNqBYbrZ7P1Rv4OnU=",
+					"dev": true
+				}
+			}
+		},
 		"unified": {
 			"version": "7.1.0",
 			"resolved": "https://registry.npmjs.org/unified/-/unified-7.1.0.tgz",
@@ -21378,6 +22878,12 @@
 			"resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
 			"integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
 		},
+		"v8-compile-cache": {
+			"version": "2.0.2",
+			"resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.0.2.tgz",
+			"integrity": "sha512-1wFuMUIM16MDJRCrpbpuEPTUGmM5QMUg0cr3KFwra2XgOgFcPGDQHDh3CszSCD2Zewc/dh/pamNEW8CbfDebUw==",
+			"dev": true
+		},
 		"validate-npm-package-license": {
 			"version": "3.0.3",
 			"resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.3.tgz",
@@ -21467,6 +22973,12 @@
 				"unist-util-stringify-position": "^1.1.1"
 			}
 		},
+		"vlq": {
+			"version": "0.2.3",
+			"resolved": "https://registry.npmjs.org/vlq/-/vlq-0.2.3.tgz",
+			"integrity": "sha512-DRibZL6DsNhIgYQ+wNdWDL2SL3bKPlVrRiBqV5yuMm++op8W4kGFtaQfCs4KEJn0wBZcHVHJ3eoywX8983k1ow==",
+			"dev": true
+		},
 		"vm-browserify": {
 			"version": "0.0.4",
 			"resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-0.0.4.tgz",
diff --git a/package.json b/package.json
index 84c9c90c49a7e..19e694f2e373e 100644
--- a/package.json
+++ b/package.json
@@ -103,6 +103,7 @@
 		"mkdirp": "0.5.1",
 		"node-sass": "4.11.0",
 		"node-watch": "0.6.0",
+		"parcel-bundler": "1.12.2",
 		"pegjs": "0.10.0",
 		"phpegjs": "1.0.0-beta7",
 		"postcss": "7.0.13",
@@ -190,7 +191,9 @@
 		"test-unit:update": "npm run test-unit -- --updateSnapshot",
 		"test-unit:watch": "npm run test-unit -- --watch",
 		"test-unit-php": "docker-compose run --rm wordpress_phpunit phpunit",
-		"test-unit-php-multisite": "docker-compose run -e WP_MULTISITE=1 --rm wordpress_phpunit phpunit"
+		"test-unit-php-multisite": "docker-compose run -e WP_MULTISITE=1 --rm wordpress_phpunit phpunit",
+		"playground:build": "npm run build:packages && parcel build playground/src/index.html -d playground/dist",
+		"playground:start": "concurrently \"npm run dev:packages\" \"parcel playground/src/index.html -d playground/dist\""
 	},
 	"lint-staged": {
 		"packages/*/package.json": [
diff --git a/playground/src/index.html b/playground/src/index.html
new file mode 100644
index 0000000000000..c1db911dfd8ca
--- /dev/null
+++ b/playground/src/index.html
@@ -0,0 +1,12 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <title>The Gutenberg Playground</title>
+</head>
+
+<body>
+	<div id="app"></div>
+  <script src="./index.js"></script>
+</body>
+</html>
diff --git a/playground/src/index.js b/playground/src/index.js
new file mode 100644
index 0000000000000..daf2a0d8297ae
--- /dev/null
+++ b/playground/src/index.js
@@ -0,0 +1,53 @@
+/**
+ * External dependencies
+ */
+import React from 'react';
+
+window.React = React;
+/**
+ * External dependencies
+ */
+import '@babel/polyfill';
+
+/**
+ * WordPress dependencies
+ */
+import '@wordpress/editor'; // This shouldn't be necessary
+
+import { render, useState } from '@wordpress/element';
+import {
+	BlockEditorProvider,
+	BlockList,
+	Inserter,
+} from '@wordpress/block-editor';
+import { registerCoreBlocks } from '@wordpress/block-library';
+
+/**
+ * Styles
+ */
+/* eslint-disable no-restricted-syntax */
+import '@wordpress/components/build-style/style.css';
+import '@wordpress/block-editor/build-style/style.css';
+import '@wordpress/block-library/build-style/style.css';
+import '@wordpress/block-library/build-style/editor.css';
+import '@wordpress/block-library/build-style/theme.css';
+/* eslint-enable no-restricted-syntax */
+
+function App() {
+	const [ blocks, updateBlocks ] = useState( [] );
+
+	return (
+		<BlockEditorProvider
+			value={ blocks } onInput={ updateBlocks } onChange={ updateBlocks }
+		>
+			<BlockList />
+			<Inserter />
+		</BlockEditorProvider>
+	);
+}
+
+registerCoreBlocks();
+render(
+	<App />,
+	document.querySelector( '#app' )
+);

From 609aba2d6ab442e42c9f21ee134cbfbdfbc7ed57 Mon Sep 17 00:00:00 2001
From: Riad Benguella <benguella@gmail.com>
Date: Tue, 19 Mar 2019 09:30:46 +0100
Subject: [PATCH 2/9] Fix basic editor styling

---
 .../rich-text/format-toolbar/index.js         |   2 +-
 playground/src/common.scss                    | 201 ++++++++++++++++++
 playground/src/editor-styles.scss             |  51 +++++
 playground/src/index.js                       |  24 ++-
 playground/src/style.scss                     |  19 ++
 5 files changed, 291 insertions(+), 6 deletions(-)
 create mode 100644 playground/src/common.scss
 create mode 100644 playground/src/editor-styles.scss
 create mode 100644 playground/src/style.scss

diff --git a/packages/block-editor/src/components/rich-text/format-toolbar/index.js b/packages/block-editor/src/components/rich-text/format-toolbar/index.js
index c1b5879626835..aa6570f620035 100644
--- a/packages/block-editor/src/components/rich-text/format-toolbar/index.js
+++ b/packages/block-editor/src/components/rich-text/format-toolbar/index.js
@@ -19,7 +19,7 @@ const FormatToolbar = ( { controls } ) => {
 					<Slot name={ `RichText.ToolbarControls.${ format }` } key={ format } />
 				) }
 				<Slot name="RichText.ToolbarControls">
-					{ ( fills ) => fills.length &&
+					{ ( fills ) => fills.length !== 0 &&
 						<DropdownMenu
 							icon={ false }
 							position="bottom left"
diff --git a/playground/src/common.scss b/playground/src/common.scss
new file mode 100644
index 0000000000000..00f474ca13073
--- /dev/null
+++ b/playground/src/common.scss
@@ -0,0 +1,201 @@
+@import "../../assets/stylesheets/colors";
+@import "../../assets/stylesheets/variables";
+@import "../../assets/stylesheets/mixins";
+@import "../../assets/stylesheets/breakpoints";
+@import "../../assets/stylesheets/animations";
+@import "../../assets/stylesheets/z-index";
+
+// TODO: screen reader text className should be replaced
+// with a component in the a11y package.
+.screen-reader-text {
+	border: 0;
+	clip: rect(1px, 1px, 1px, 1px);
+	-webkit-clip-path: inset(50%);
+	clip-path: inset(50%);
+	height: 1px;
+	margin: -1px;
+	overflow: hidden;
+	padding: 0;
+	position: absolute;
+	width: 1px;
+	word-wrap: normal !important;
+}
+
+// TODO: Extract these WP Global styles to a mixin
+// We can't apply these globally to html or body at the moment because of the WP sidebar/menu
+:root {
+	box-sizing: border-box;
+
+	*,
+	*::before,
+	*::after {
+		box-sizing: inherit;
+	}
+
+	select {
+		font-size: $default-font-size;
+		color: $dark-gray-500;
+	}
+
+	.input-control, // Upstream name is `.regular-text`.
+	input[type="text"],
+	input[type="search"],
+	input[type="radio"],
+	input[type="tel"],
+	input[type="time"],
+	input[type="url"],
+	input[type="week"],
+	input[type="password"],
+	input[type="checkbox"],
+	input[type="color"],
+	input[type="date"],
+	input[type="datetime"],
+	input[type="datetime-local"],
+	input[type="email"],
+	input[type="month"],
+	input[type="number"],
+	select,
+	textarea {
+		font-family: $default-font;
+		padding: 6px 8px;
+		@include input-style__neutral();
+
+		/* Fonts smaller than 16px causes mobile safari to zoom. */
+		font-size: $mobile-text-min-font-size;
+		@include break-small {
+			font-size: $default-font-size;
+		}
+
+		&:focus {
+			@include input-style__focus();
+		}
+	}
+
+	input[type="number"] {
+		padding-left: 4px;
+		padding-right: 4px;
+	}
+
+	select {
+		padding: 2px;
+
+		&:focus {
+			border-color: $blue-medium-600;
+			// Windows High Contrast mode will show this outline
+			outline: 2px solid transparent;
+			outline-offset: 0;
+		}
+	}
+
+	input[type="checkbox"],
+	input[type="radio"] {
+		border: $border-width + 1 solid $dark-gray-300;
+		margin-right: 12px;
+		transition: none;
+
+		&:focus {
+			border-color: $dark-gray-300;
+			box-shadow: 0 0 0 1px $dark-gray-300;
+		}
+
+		&:checked {
+			background: theme(toggle);
+			border-color: theme(toggle);
+		}
+
+		&:checked:focus {
+			box-shadow: 0 0 0 2px $dark-gray-500;
+		}
+	}
+
+	input[type="checkbox"] {
+		border-radius: $radius-round-rectangle / 2;
+
+		&:checked::before,
+		&[aria-checked="mixed"]::before {
+			margin: -3px -5px;
+			color: $white;
+
+			@include break-medium() {
+				margin: -4px 0 0 -5px;
+			}
+		}
+
+		&[aria-checked="mixed"] {
+			background: theme(toggle);
+			border-color: theme(toggle);
+
+			&::before {
+				// Inherited from `forms.css`.
+				// See: https://github.com/WordPress/wordpress-develop/tree/5.1.1/src/wp-admin/css/forms.css#L122-L132
+				content: "\f460";
+				float: left;
+				display: inline-block;
+				vertical-align: middle;
+				width: 16px;
+				/* stylelint-disable */
+				font: normal 30px/1 dashicons;
+				/* stylelint-enable */
+				speak: none;
+				-webkit-font-smoothing: antialiased;
+				-moz-osx-font-smoothing: grayscale;
+
+				@include break-medium() {
+					float: none;
+					font-size: 21px;
+				}
+			}
+
+			&:focus {
+				box-shadow: 0 0 0 2px $dark-gray-500;
+			}
+		}
+	}
+
+	input[type="radio"] {
+		border-radius: $radius-round;
+
+		&:checked::before {
+			margin: 3px 0 0 3px;
+			background-color: $white;
+		}
+	}
+
+	// Placeholder colors
+	input,
+	textarea {
+		// Use opacity to work in various editor styles.
+		&::-webkit-input-placeholder {
+			color: $dark-opacity-300;
+		}
+
+		&::-moz-placeholder {
+			opacity: 1; // Necessary because Firefox reduces this from 1.
+			color: $dark-opacity-300;
+		}
+
+		&:-ms-input-placeholder {
+			color: $dark-opacity-300;
+		}
+
+		.is-dark-theme & {
+			&::-webkit-input-placeholder {
+				color: $light-opacity-300;
+			}
+
+			&::-moz-placeholder {
+				opacity: 1; // Necessary because Firefox reduces this from 1.
+				color: $light-opacity-300;
+			}
+
+			&:-ms-input-placeholder {
+				color: $light-opacity-300;
+			}
+		}
+	}
+}
+
+a,
+div {
+	outline: 0;
+}
diff --git a/playground/src/editor-styles.scss b/playground/src/editor-styles.scss
new file mode 100644
index 0000000000000..7337f68fe2bc7
--- /dev/null
+++ b/playground/src/editor-styles.scss
@@ -0,0 +1,51 @@
+.editor-styles-wrapper {
+	font-family: $editor-font;
+	font-size: $editor-font-size;
+	line-height: $editor-line-height;
+	color: $dark-gray-900;
+
+	p {
+		font-size: inherit;
+		line-height: inherit;
+	}
+
+	ul,
+	ol {
+		margin: 0;
+		padding: 0;
+	}
+
+	ul li,
+	ol li {
+		// This overrides a bottom margin globally applied to list items in wp-admin.
+		margin-bottom: initial;
+	}
+
+	ul {
+		list-style-type: disc;
+	}
+
+	ol {
+		list-style-type: decimal;
+	}
+
+	ul ul,
+	ol ul {
+		list-style-type: circle;
+	}
+
+	// These are default editor styles
+	.wp-block {
+		max-width: 700px;
+
+		// TODO: the default padding/margin of the block editor content are not set properly
+		margin-left: auto;
+		margin-right: auto;
+	}
+	.wp-block[data-align="wide"] {
+		max-width: 1100px;
+	}
+	.wp-block[data-align="full"] {
+		max-width: none;
+	}
+}
diff --git a/playground/src/index.js b/playground/src/index.js
index daf2a0d8297ae..3df8603da8e8d 100644
--- a/playground/src/index.js
+++ b/playground/src/index.js
@@ -18,19 +18,25 @@ import { render, useState } from '@wordpress/element';
 import {
 	BlockEditorProvider,
 	BlockList,
-	Inserter,
+	WritingFlow,
+	ObserveTyping,
 } from '@wordpress/block-editor';
+import { Popover } from '@wordpress/components';
 import { registerCoreBlocks } from '@wordpress/block-library';
+import '@wordpress/format-library';
 
 /**
- * Styles
+ * Internal dependencies
  */
+import './style.scss';
+
 /* eslint-disable no-restricted-syntax */
 import '@wordpress/components/build-style/style.css';
 import '@wordpress/block-editor/build-style/style.css';
 import '@wordpress/block-library/build-style/style.css';
 import '@wordpress/block-library/build-style/editor.css';
 import '@wordpress/block-library/build-style/theme.css';
+import '@wordpress/format-library/build-style/style.css';
 /* eslint-enable no-restricted-syntax */
 
 function App() {
@@ -38,10 +44,18 @@ function App() {
 
 	return (
 		<BlockEditorProvider
-			value={ blocks } onInput={ updateBlocks } onChange={ updateBlocks }
+			value={ blocks }
+			onInput={ updateBlocks }
+			onChange={ updateBlocks }
 		>
-			<BlockList />
-			<Inserter />
+			<div className="editor-styles-wrapper">
+				<WritingFlow>
+					<ObserveTyping>
+						<BlockList />
+					</ObserveTyping>
+				</WritingFlow>
+			</div>
+			<Popover.Slot />
 		</BlockEditorProvider>
 	);
 }
diff --git a/playground/src/style.scss b/playground/src/style.scss
new file mode 100644
index 0000000000000..703a694db017f
--- /dev/null
+++ b/playground/src/style.scss
@@ -0,0 +1,19 @@
+@import "./common.scss";
+@import "./editor-styles.scss";
+
+#app {
+	padding-top: 20px;
+
+	img {
+		max-width: 100%;
+		height: auto;
+	}
+
+	iframe {
+		width: 100%;
+	}
+
+	.components-navigate-regions {
+		height: 100%;
+	}
+}

From 59d079b726c7a72379f0f5e5e8c1d8666a26320b Mon Sep 17 00:00:00 2001
From: Riad Benguella <benguella@gmail.com>
Date: Thu, 21 Mar 2019 09:30:32 +0100
Subject: [PATCH 3/9] Add google font

---
 playground/src/index.html | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/playground/src/index.html b/playground/src/index.html
index c1db911dfd8ca..11576c6aa4118 100644
--- a/playground/src/index.html
+++ b/playground/src/index.html
@@ -1,12 +1,13 @@
 <!doctype html>
 <html lang="en">
 <head>
-  <meta charset="utf-8">
-  <title>The Gutenberg Playground</title>
+	<meta charset="utf-8">
+	<title>The Gutenberg Playground</title>
+	<link href="https://fonts.googleapis.com/css?family=Noto+Serif:400,700" rel="stylesheet">
 </head>
 
 <body>
 	<div id="app"></div>
-  <script src="./index.js"></script>
+	<script src="./index.js"></script>
 </body>
 </html>

From ecaaf8cd3bc8c66e2d773dee28d5290037dc0937 Mon Sep 17 00:00:00 2001
From: Riad Benguella <benguella@gmail.com>
Date: Thu, 21 Mar 2019 09:54:33 +0100
Subject: [PATCH 4/9] Fix babel config

---
 .babelrc                | 9 +++++++--
 playground/src/index.js | 6 ------
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/.babelrc b/.babelrc
index 8a1e754e7fba1..4e7ed80cab13c 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,3 +1,8 @@
 {
-	"presets": ["@wordpress/babel-preset-default"]
-}
+	"presets": ["@wordpress/babel-preset-default"],
+	"plugins": [
+		[ "@babel/plugin-transform-react-jsx", {
+			"pragma": "createElement"
+		} ]
+	]
+}
\ No newline at end of file
diff --git a/playground/src/index.js b/playground/src/index.js
index 3df8603da8e8d..dbea5e110407e 100644
--- a/playground/src/index.js
+++ b/playground/src/index.js
@@ -1,9 +1,3 @@
-/**
- * External dependencies
- */
-import React from 'react';
-
-window.React = React;
 /**
  * External dependencies
  */

From 8d965d2ed9ddf77333fb61c680d62369b98fe183 Mon Sep 17 00:00:00 2001
From: Riad Benguella <benguella@gmail.com>
Date: Thu, 21 Mar 2019 13:54:46 +0100
Subject: [PATCH 5/9] Use the reset mixin

---
 playground/src/common.scss | 172 +------------------------------------
 1 file changed, 1 insertion(+), 171 deletions(-)

diff --git a/playground/src/common.scss b/playground/src/common.scss
index 00f474ca13073..a808b3161a8ac 100644
--- a/playground/src/common.scss
+++ b/playground/src/common.scss
@@ -21,178 +21,8 @@
 	word-wrap: normal !important;
 }
 
-// TODO: Extract these WP Global styles to a mixin
-// We can't apply these globally to html or body at the moment because of the WP sidebar/menu
 :root {
-	box-sizing: border-box;
-
-	*,
-	*::before,
-	*::after {
-		box-sizing: inherit;
-	}
-
-	select {
-		font-size: $default-font-size;
-		color: $dark-gray-500;
-	}
-
-	.input-control, // Upstream name is `.regular-text`.
-	input[type="text"],
-	input[type="search"],
-	input[type="radio"],
-	input[type="tel"],
-	input[type="time"],
-	input[type="url"],
-	input[type="week"],
-	input[type="password"],
-	input[type="checkbox"],
-	input[type="color"],
-	input[type="date"],
-	input[type="datetime"],
-	input[type="datetime-local"],
-	input[type="email"],
-	input[type="month"],
-	input[type="number"],
-	select,
-	textarea {
-		font-family: $default-font;
-		padding: 6px 8px;
-		@include input-style__neutral();
-
-		/* Fonts smaller than 16px causes mobile safari to zoom. */
-		font-size: $mobile-text-min-font-size;
-		@include break-small {
-			font-size: $default-font-size;
-		}
-
-		&:focus {
-			@include input-style__focus();
-		}
-	}
-
-	input[type="number"] {
-		padding-left: 4px;
-		padding-right: 4px;
-	}
-
-	select {
-		padding: 2px;
-
-		&:focus {
-			border-color: $blue-medium-600;
-			// Windows High Contrast mode will show this outline
-			outline: 2px solid transparent;
-			outline-offset: 0;
-		}
-	}
-
-	input[type="checkbox"],
-	input[type="radio"] {
-		border: $border-width + 1 solid $dark-gray-300;
-		margin-right: 12px;
-		transition: none;
-
-		&:focus {
-			border-color: $dark-gray-300;
-			box-shadow: 0 0 0 1px $dark-gray-300;
-		}
-
-		&:checked {
-			background: theme(toggle);
-			border-color: theme(toggle);
-		}
-
-		&:checked:focus {
-			box-shadow: 0 0 0 2px $dark-gray-500;
-		}
-	}
-
-	input[type="checkbox"] {
-		border-radius: $radius-round-rectangle / 2;
-
-		&:checked::before,
-		&[aria-checked="mixed"]::before {
-			margin: -3px -5px;
-			color: $white;
-
-			@include break-medium() {
-				margin: -4px 0 0 -5px;
-			}
-		}
-
-		&[aria-checked="mixed"] {
-			background: theme(toggle);
-			border-color: theme(toggle);
-
-			&::before {
-				// Inherited from `forms.css`.
-				// See: https://github.com/WordPress/wordpress-develop/tree/5.1.1/src/wp-admin/css/forms.css#L122-L132
-				content: "\f460";
-				float: left;
-				display: inline-block;
-				vertical-align: middle;
-				width: 16px;
-				/* stylelint-disable */
-				font: normal 30px/1 dashicons;
-				/* stylelint-enable */
-				speak: none;
-				-webkit-font-smoothing: antialiased;
-				-moz-osx-font-smoothing: grayscale;
-
-				@include break-medium() {
-					float: none;
-					font-size: 21px;
-				}
-			}
-
-			&:focus {
-				box-shadow: 0 0 0 2px $dark-gray-500;
-			}
-		}
-	}
-
-	input[type="radio"] {
-		border-radius: $radius-round;
-
-		&:checked::before {
-			margin: 3px 0 0 3px;
-			background-color: $white;
-		}
-	}
-
-	// Placeholder colors
-	input,
-	textarea {
-		// Use opacity to work in various editor styles.
-		&::-webkit-input-placeholder {
-			color: $dark-opacity-300;
-		}
-
-		&::-moz-placeholder {
-			opacity: 1; // Necessary because Firefox reduces this from 1.
-			color: $dark-opacity-300;
-		}
-
-		&:-ms-input-placeholder {
-			color: $dark-opacity-300;
-		}
-
-		.is-dark-theme & {
-			&::-webkit-input-placeholder {
-				color: $light-opacity-300;
-			}
-
-			&::-moz-placeholder {
-				opacity: 1; // Necessary because Firefox reduces this from 1.
-				color: $light-opacity-300;
-			}
-
-			&:-ms-input-placeholder {
-				color: $light-opacity-300;
-			}
-		}
-	}
+	@include reset;
 }
 
 a,

From c42945c8c3cc3eaed46c590f0f7320b95eabb740 Mon Sep 17 00:00:00 2001
From: Riad Benguella <benguella@gmail.com>
Date: Thu, 21 Mar 2019 16:51:00 +0100
Subject: [PATCH 6/9] Tweak the playground design

---
 playground/src/index.js                    | 35 +++++++++++++---------
 playground/src/{common.scss => reset.scss} | 15 +++++-----
 playground/src/style.scss                  | 24 +++++++++++++--
 3 files changed, 50 insertions(+), 24 deletions(-)
 rename playground/src/{common.scss => reset.scss} (59%)

diff --git a/playground/src/index.js b/playground/src/index.js
index dbea5e110407e..0e0bc6a87f8d8 100644
--- a/playground/src/index.js
+++ b/playground/src/index.js
@@ -8,7 +8,7 @@ import '@babel/polyfill';
  */
 import '@wordpress/editor'; // This shouldn't be necessary
 
-import { render, useState } from '@wordpress/element';
+import { render, useState, Fragment } from '@wordpress/element';
 import {
 	BlockEditorProvider,
 	BlockList,
@@ -37,20 +37,27 @@ function App() {
 	const [ blocks, updateBlocks ] = useState( [] );
 
 	return (
-		<BlockEditorProvider
-			value={ blocks }
-			onInput={ updateBlocks }
-			onChange={ updateBlocks }
-		>
-			<div className="editor-styles-wrapper">
-				<WritingFlow>
-					<ObserveTyping>
-						<BlockList />
-					</ObserveTyping>
-				</WritingFlow>
+		<Fragment>
+			<div className="playground__header">
+				<h1 className="playground__logo">Gutenberg Playground</h1>
 			</div>
-			<Popover.Slot />
-		</BlockEditorProvider>
+			<div className="playground__body">
+				<BlockEditorProvider
+					value={ blocks }
+					onInput={ updateBlocks }
+					onChange={ updateBlocks }
+				>
+					<div className="editor-styles-wrapper">
+						<WritingFlow>
+							<ObserveTyping>
+								<BlockList />
+							</ObserveTyping>
+						</WritingFlow>
+					</div>
+					<Popover.Slot />
+				</BlockEditorProvider>
+			</div>
+		</Fragment>
 	);
 }
 
diff --git a/playground/src/common.scss b/playground/src/reset.scss
similarity index 59%
rename from playground/src/common.scss
rename to playground/src/reset.scss
index a808b3161a8ac..e8fca9903cccd 100644
--- a/playground/src/common.scss
+++ b/playground/src/reset.scss
@@ -1,10 +1,3 @@
-@import "../../assets/stylesheets/colors";
-@import "../../assets/stylesheets/variables";
-@import "../../assets/stylesheets/mixins";
-@import "../../assets/stylesheets/breakpoints";
-@import "../../assets/stylesheets/animations";
-@import "../../assets/stylesheets/z-index";
-
 // TODO: screen reader text className should be replaced
 // with a component in the a11y package.
 .screen-reader-text {
@@ -25,6 +18,14 @@
 	@include reset;
 }
 
+html,
+body {
+	margin: 0;
+	padding: 0;
+	font-family: $default-font;
+	font-size: $default-font-size;
+}
+
 a,
 div {
 	outline: 0;
diff --git a/playground/src/style.scss b/playground/src/style.scss
index 703a694db017f..1d4f7adb3296f 100644
--- a/playground/src/style.scss
+++ b/playground/src/style.scss
@@ -1,7 +1,25 @@
-@import "./common.scss";
-@import "./editor-styles.scss";
+@import "../../assets/stylesheets/colors";
+@import "../../assets/stylesheets/variables";
+@import "../../assets/stylesheets/mixins";
+@import "../../assets/stylesheets/breakpoints";
+@import "../../assets/stylesheets/animations";
+@import "../../assets/stylesheets/z-index";
 
-#app {
+@import "./reset";
+@import "./editor-styles";
+
+
+.playground__header {
+	padding: 20px;
+	border-bottom: 1px solid #ddd;
+}
+
+.playground__logo {
+	font-size: 20px;
+	font-weight: 300;
+}
+
+.playground__body {
 	padding-top: 20px;
 
 	img {

From 696a22973c0940025a9641e4d222443330f93330 Mon Sep 17 00:00:00 2001
From: Riad Benguella <benguella@gmail.com>
Date: Thu, 21 Mar 2019 16:57:24 +0100
Subject: [PATCH 7/9] Documenting the Playground on the Contributing docs

---
 CONTRIBUTING.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 576e78b27a3ee..ad0dec59d161d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -108,6 +108,12 @@ You can pick among all the <a href="https://github.com/WordPress/gutenberg/issue
 
 The workflow is documented in greater detail in the [repository management](/docs/contributors/repository-management.md) document.
 
+## Playground
+
+The Gutenberg repository also includes a static Gutenberg playground that allows testing and developping in a WordPress-agnostic context. This is very helpful for developping reusable components and trying generic JavaScript modules without any backend dependency.
+
+You can launch the playground by running `npm run playground:start` locally. The playground should be available on [http://localhost:1234](http://localhost:1234).
+
 ## Testing
 
 Gutenberg contains both PHP and JavaScript code and encourages testing and code style linting for both. It also incorporates end-to-end testing using [Google Puppeteer](https://developers.google.com/web/tools/puppeteer/). You can find out more details in [Testing Overview document](/docs/contributors/testing-overview.md).

From 2c16a8a5d4e212f63fcfc1c5b0b2f2f480b4f150 Mon Sep 17 00:00:00 2001
From: Riad Benguella <benguella@gmail.com>
Date: Mon, 25 Mar 2019 11:58:49 +0100
Subject: [PATCH 8/9] Fix typo

---
 CONTRIBUTING.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ad0dec59d161d..703b36ffc2967 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -110,7 +110,7 @@ The workflow is documented in greater detail in the [repository management](/doc
 
 ## Playground
 
-The Gutenberg repository also includes a static Gutenberg playground that allows testing and developping in a WordPress-agnostic context. This is very helpful for developping reusable components and trying generic JavaScript modules without any backend dependency.
+The Gutenberg repository also includes a static Gutenberg playground that allows testing and developing in a WordPress-agnostic context. This is very helpful for developing reusable components and trying generic JavaScript modules without any backend dependency.
 
 You can launch the playground by running `npm run playground:start` locally. The playground should be available on [http://localhost:1234](http://localhost:1234).
 

From 2be9b5b25f2aeb4230838417641852cea525e820 Mon Sep 17 00:00:00 2001
From: Riad Benguella <benguella@gmail.com>
Date: Mon, 25 Mar 2019 13:21:18 +0100
Subject: [PATCH 9/9] Move .babelrc to the playground folder

---
 .babelrc => playground/.babelrc | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename .babelrc => playground/.babelrc (100%)

diff --git a/.babelrc b/playground/.babelrc
similarity index 100%
rename from .babelrc
rename to playground/.babelrc