JSFiddle - React, Tailwind, and code Playground

HTML

<div id="res"></div>

JavaScript

var html = '<form method="POST"><input type="text" value="input-value" name="inp"><input type="password" name="pass" value="mypass"><input type="submit" value="ok"></form>';

var elem = $(html);
console.log(elem); //Это сам элемент <form> (уже обвернутый jquery)
console.log(elem.attr('method')); //Получим метод формы