JSFiddle - React, Tailwind, and code Playground

by int32_t

HTML

<pre id=console></pre>

JavaScript

function log(mes) {
    document.getElementById('console').textContent += mes + '\n';
}

try {
    var f = document.body instanceof Entity;
    log('Entity check: ' + f);
} catch (e) {
    log('Entity check: ' + e);
}
try {
    var f = document.body instanceof Notation;
    log('Notation check: ' + f);
} catch (e) {
    log('Notation check: ' + e);
}