test.js

async function checkText() {
    // call the check method
    var results = await TXSpell.check(document.getElementById('textbox').textContent);

    // check console for details
    console.log(results);
    var consoleText = "";

    // loop through the results and return the text
    results.forEach(function (element) {
        consoleText += "<p>Misspelled: <strong>" + element.text + "</strong></p>";
    });

    document.getElementById('results').innerHTML = consoleText;
}