[Python] Can label or button act as parent in tkinter?

I always thought that only frame and other container elements can be parent, but recently when I tried the below code, it seemed to work perfectly without any error.

import os
import tkinter as tk
from PIL import Image, ImageTk

BASE_DIR = os.path.dirname(os.path.abspath(__file__))

main = tk.Tk()
main.title("Main Window")
main.config(bg="#E4E2E2")
main.geometry("700x400")


frame = tk.Frame(master=main)
frame.config(bg="#d1c9c9")
frame.pack()


label2 = tk.Label(master=frame, text="Password")
label2.config(bg="#d1c9c9", fg="#000")
label2.pack(side=tk.TOP)


button = tk.Button(master=frame, text="Submit")
button.config(bg="#161515", fg="#ffffff")
button.pack(side=tk.TOP)

entry1 = tk.Entry(master=button)
entry1.config(bg="#fff", fg="#000")
entry1.pack(side=tk.TOP)


main.mainloop()


The entry seems to be appearing inside the button when i try it on my linux PC. So, is it fine to use labels, button widgets and others as parents? Will it cause any issues on other OS?

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