I noticed something odd today. Can someone explain what's going on here ?

1. Text Spoiler

Normal Spoiler

Spoiler without closing tag

Text outside spoiler.

Spoiler without closing tag

Normal Spoiler

Also, how do you put code in a spoiler ? It no longer works the way it used to I think.

2. Code Spoiler

#include <bits/stdc++.h>
using namespace std;

int main(){
    return 0;
}

Here are some images for the plain text I used.