Hello World!

.metadata.json

{
  "origin": "dartlab.org",
  "url": "http://dartlab.org/#:gistId",
  "history": [
    "9aace131ee1c8027e06c",
    "7c210d0f19d9a15fd7cb"
  ]
}

body.html

<h1>Hello from HTML!</h1>
<h1><span/></h1>

main.dart

// Go ahead and modify this example.

import "dart:html";

var greeting = "Hello from Dart!";

// Displays a greeting.
void main() {
  // This example uses HTML to display the greeting and it will appear
  // in a nested HTML frame (an iframe).
  document.body.append(new HeadingElement.h1()..appendText(greeting));
}

style.css

span:after {
    content: "Hello from CSS!";
}