HTML and XHTML uses standard 7-BIT ASCII when transmitting data over the Web.
7-BIT ASCII represents 128 different character values (0-127).

7-BIT Printable ASCII Characters

Result	Description	Entity Number
	space	 
!	exclamation mark	!
"	quotation mark	"
#	number sign	#
$	dollar sign	$
%	percent sign	%
&	ampersand	&
'	apostrophe	'
(	left parenthesis	(
)	right parenthesis	)
*	asterisk	*
+	plus sign	+
,	comma	,
-	hyphen	-
.	period	.
/	slash	/
0	digit 0	0
1	digit 1	1
2	digit 2	2
3	digit 3	3
4	digit 4	4
5	digit 5	5
6	digit 6	6
7	digit 7	7
8	digit 8	8
9	digit 9	9
:	colon	:
;	semicolon	&#59;
<	less-than	&#60;
=	equals-to	&#61;
>	greater-than	&#62;
?	question mark	&#63;
@	at sign	&#64;
A	uppercase A	&#65;
B	uppercase B	&#66;
C	uppercase C	&#67;
D	uppercase D	&#68;
E	uppercase E	&#69;
F	uppercase F	&#70;
G	uppercase G	&#71;
H	uppercase H	&#72;
I	uppercase I	&#73;
J	uppercase J	&#74;
K	uppercase K	&#75;
L	uppercase L	&#76;
M	uppercase M	&#77;
N	uppercase N	&#78;
O	uppercase O	&#79;
P	uppercase P	&#80;
Q	uppercase Q	&#81;
R	uppercase R	&#82;
S	uppercase S	&#83;
T	uppercase T	&#84;
U	uppercase U	&#85;
V	uppercase V	&#86;
W	uppercase W	&#87;
X	uppercase X	&#88;
Y	uppercase Y	&#89;
Z	uppercase Z	&#90;
[	left square bracket	&#91;
\	backslash	&#92;
]	right square bracket	&#93;
^	caret	&#94;
_	underscore	&#95;
`	grave accent	&#96;
a	lowercase a	&#97;
b	lowercase b	&#98;
c	lowercase c	&#99;
d	lowercase d	&#100;
e	lowercase e	&#101;
f	lowercase f	&#102;
g	lowercase g	&#103;
h	lowercase h	&#104;
i	lowercase i	&#105;
j	lowercase j	&#106;
k	lowercase k	&#107;
l	lowercase l	&#108;
m	lowercase m	&#109;
n	lowercase n	&#110;
o	lowercase o	&#111;
p	lowercase p	&#112;
q	lowercase q	&#113;
r	lowercase r	&#114;
s	lowercase s	&#115;
t	lowercase t	&#116;
u	lowercase u	&#117;
v	lowercase v	&#118;
w	lowercase w	&#119;
x	lowercase x	&#120;
y	lowercase y	&#121;
z	lowercase z	&#122;
{	left curly brace	&#123;
|	vertical bar	&#124;
}	right curly brace	&#125;
~	tilde	&#126;

7-BIT ASCII Device Control Characters

ASCII device control characters were originally designed to control hardware devices like printers and tape drives. These characters have nothing to do inside any HTML document.

Result	Description	Entity Number
NUL	null character	�
SOH	start of header	
STX	start of text	
ETX	end of text	
EOT	end of transmission	
ENQ	enquiry	
ACK	acknowledge	
BEL	bell (ring)	
BS	backspace	
HT	horizontal tab		
LF	line feed	

VT	vertical tab	
FF	form feed	
CR	carriage return	
SO	shift out	
SI	shift in	
DLE	data link escape	
DC1	device control 1	
DC2	device control 2	
DC3	device control 3	
DC4	device control 4	
NAK	negative acknowledge	
SYN	synchronize	
ETB	end transmission block	
CAN	cancel	
EM	end of medium	
SUB	substitute	
ESC	escape	
FS	file separator	
GS	group separator	
RS	record separator	
US	unit separator	
DEL	delete (rubout)	

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