<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<meta http-equiv='X-UA-Compatible' content='IE=edge'>
<title>Hamburger Icon MI Series - 04</title>
<meta name='viewport' content='width=device-width, initial-scale=1'>
<link rel='stylesheet' type='text/css' media='screen' href='style.css'>
</head>
<body>
<button class="hamburger" id="menu_toggle">
<div class="line"></div>
<div class="line"></div>
<div class="line"></div>
</button>
<script>
const btn = document.getElementById("menu_toggle");
const lines = btn.querySelectorAll(".line");
const cls = { open: "open", close: "close" };
let btnClass = cls.open;
btn.addEventListener("click", () => {
if (btn.classList.contains(cls.open)) {
btn.classList.remove(btnClass);
btnClass = cls.close;
} else if (btn.classList.contains(cls.close)) {
btn.classList.remove(btnClass);
btnClass = cls.open;
}
void btn.offsetWidth;
btn.classList.add(btnClass);
});
</script>
</body>
</html>