HTML 和 XHTML 用标准的 7 比特 ASCII 代码在网络上传输数据。
7 比特 ASCII 代码可提供 128 个不同的字符值。
<html> <!-------- 结果 描述 实体编号 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 ; < less-than < = equals-to = > greater-than > ? question mark ? @ at sign @ A uppercase A A B uppercase B B C uppercase C C D uppercase D D E uppercase E E F uppercase F F G uppercase G G H uppercase H H I uppercase I I J uppercase J J K uppercase K K L uppercase L L M uppercase M M N uppercase N N O uppercase O O P uppercase P P Q uppercase Q Q R uppercase R R S uppercase S S T uppercase T T U uppercase U U V uppercase V V W uppercase W W X uppercase X X Y uppercase Y Y Z uppercase Z Z [ left square bracket [ \ backslash \ ] right square bracket ] ^ caret ^ _ underscore _ ` grave accent ` a lowercase a a b lowercase b b c lowercase c c d lowercase d d e lowercase e e f lowercase f f g lowercase g g h lowercase h h i lowercase i i j lowercase j j k lowercase k k l lowercase l l m lowercase m m n lowercase n n o lowercase o o p lowercase p p q lowercase q q r lowercase r r s lowercase s s t lowercase t t u lowercase u u v lowercase v v w lowercase w w x lowercase x x y lowercase y y z lowercase z z { left curly brace { | vertical bar | } right curly brace } ~ tilde ~ ----> </html>
ASCII设备控制代码最初被设计为用来控制诸如打印机和磁带驱动器之类的硬件设备。在HTML文档中这些代码不会起任何作用。
<html> <!------ 结果 描述 实体编号 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)  ---> </html>
html-----015---HTML ASCII 参考手册
原文：http://www.cnblogs.com/9999w/p/4381967.html