br nested within elements

Classified as: flow content, phrasing content

Parents, br

Valid Syntax 1
1 2 3 4 5 6 710 11 12 13	<!doctype html> <html> <head> <title>...</title> </head> <body> <p> ... <br> ... <br> ...</p> </body> </html>

Invalid Syntax 2
1 2 3 4 5 6 710 11 12	<!doctype html> <html> <head> <title>...</title> <br> </head> <body> </body> </html>

Syntax 1: Valid, multiple br elements allowed per HTML5 document; br nested inside p: allowed
Syntax 2: Invalid, br nested inside head: not allowed