matrix-js-sdk/examples/browser/browserTest.js

console.log("Loading browser sdk");

var client = matrixcs.createClient({baseUrl: "https://matrix.org"});
client.publicRooms().then(function (data) {
    console.log("data %s [...]", JSON.stringify(data).substring(0, 100));
    console.log("Congratulations! The SDK is working on the browser!");
    var result = document.getElementById("result");
    result.innerHTML = "<p>The SDK appears to be working correctly.</p>";
});