JSFiddle - React, Tailwind, and code Playground

JavaScript

document.body.appendChild(document.createTextNode(
(function isInputTypeFileImplemented(){
    var elem = document.createElement("input");
    elem.type = "file";
    if (elem.disabled) return false;
    try {
        elem.value = "Test"; //Throws error if type=file is implemented
        return elem.value != "Test";
    } catch(e) {
        return elem.type == "file";
    }
})()
));