// Function that writes to a div with id='message' on the page.
function write(message){
    document.getElementById('message').innerText += message;
}

In Word if you want to write HTML to the selection, you can specify the coercionType parameter as "html" as shown in the following example, which uses HTML <b> tags to make "Hello" bold.
JavaScript

function writeHtmlData() {
    Office.document.setSelectedDataAsync("<b>Hello</b> World!", {coercionType: "html"}, function (asyncResult) {
        if (asyncResult.status == "failed") {
            write('Error: ' + asyncResult.error.message);
        }
    });
}

// Function that writes to a div with id='message' on the page.
function write(message){
    document.getElementById('message').innerText += message;
}

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