The tags of HTML are used to define how the page looks like. The presentation with the looks is what tags are used for.
There are many sets of special characters used.
HTML entities are used to input characters that you wouldn't be able to input normally such as the greater than sign. To input such characters, you use special syntax, such as '>' for greater than.
One can find a list of special characters in HTML when one goes to the website of the University of Texas. There is a special page entitled "HTML characters". There one can find the special characters as well as their meanings.
I don't know what you mean by that, but I am going to say no. HTML only works in HTML. You can add special characters to HTML by doing: & copy; & trade; & reg;
Box-like computer characters can either represent characters in the Chinese language, or may be the result of code used to create HTML.
Meta tag is the one that stores the meta-data about the HTML file. It contains the characteristics of the characters to be used.
by using java script
Meta tags are used at the start of a web page made in HTML. It defines the charset of the characters.
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HTML tags are used to delimit HTML elements inside an HTML document.
Generally, characters not surrounded by '<' and '>' signs are considered text in HTML. Characters between '<' and '>' signs are considered tags. Also characters between <script> and </script> tags are not considered text, they are script body and are executed by script interpreter, not simply displayed on webpage.
There are 255 special HTML characters. The list would be to extensive to even post here. Not to mention I do not know if it would mess with the script of this site. Your best bet is to search the internet for the words "Special HTML Characters"and it will display many websites explaining this. If you still wish for me to post the information here let me know and I will figure out how to make it happen.