Why do span works only for h1 type of heading?

Question

span in h1 gives a blue box around it but in others it won't why?

Answer 1

Wich code?
Wich browser/device os?

I can use <span> inside <h1> without the blue box behaviour about which you describe ^^

Answer 2

Your code might have a CSS code for span that's why.
h1 span{}
Like this that's why it is working for h1elem only

Answer 3

No, span tag works with any block elements.

Answer 4

because you use them with h1 :D