⎗ text/html

File Extensions

html, htm

Magic Bytes

1. HTML preamble prefix in upper caase

   Offset	0	1	2	3	4	5	6	7
   Byte	0x3c	0x21	0x44	0x4f	0x43	0x54	0x59	0x50
   Char	<	!	D	O	C	T	Y	P

2. HTML preamble prefix in lower caase

   Offset	0	1	2	3	4	5	6	7
   Byte	0x3c	0x21	0x64	0x6f	0x63	0x74	0x79	0x70
   Char	<	!	d	o	c	t	y	p

References

• Media Type Assignment
• RFC 2854 - Registration of MIME media type text/html
• WHATWG HTML Specification - The DOCTYPE