Instructions for using 6 uncommon HTML tags_HTML/Xhtml_Web page production

The first one: or
These two logos are the same thing. They are mainly used for some English abbreviations. When you move the mouse up, you will find that a small prompt will appear. Prompt the full name of the abbreviation. Here is an example:

HTML
IEEE
RTFSC

Second: This logo is mainly to add double quotation marks to the quoted text. This logo seems to be very meaningless. Officially, it is for convenience, but I always feel that this logo is not as convenient as directly entering double quotes. It seems like nothing. Could it be that this logo can only be seen under Firefox, and IE does not support it. The following is an example: This is a quotation This is a quotation This is a quotation

The third one, is very interesting. It can put all the words in order from left to right. Reversed. For example: May I help you sir ? If this logo is added, it will look like this: May I help you sir ? What can I do for you? May I help you sir ? What can I do for you? May I help you sir ?What can I do for you?

Fourth, strikethrough your string. For example: This is a deleted text. This is a deleted textThis is a deleted text

The fifth and sixth ones, ^{_{these two are subscripts and superscripts. Here are examples: This is a subscript, this is a superscript. This is a subscript, this is a superscript}}