How do I replicate a \t tab space in HTML?

HTML doesn't have escape characters (as it doesn't use escape-semantics for reserved characters, instead you use SGML entities: &, <, > and ").

SGML does not have a named-entity for the tab character as it exists in most character sets (i.e. 0x09 in ASCII and UTF-8), rendering it completely unnecessary (i.e. simply press the Tab key on your keyboard). If you're working with code that generates HTML (e.g. a server-side application, e.g. ASP.NET, PHP or Perl, then you might need to escape it then, but only because the server-side language demands it - it has nothing to do with HTML, like so:

echo "<pre>\t\tTABS!\t\t</pre>";

But, you can use SGML entities to represent any ISO-8859-1 character by hexadecimal value, e.g. 	 for a tab character.

I need a code that has the same function as the /t escape character

What function do you mean, creating a tabulator space?

No such thing in HTML, you'll have to use HTML elements for that. (A <table> may make sense for tabular data, or a description list <dl> for definitions.)

You can use this   or  

It works on Visual Studio

You must use

<dd> </dd> in the html code.

<dd>A free, open source, cross-platform,graphical web browser developed by theMozilla Corporation and hundreds of volunteers.</dd>

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Firefox
    A free, open source, cross-platform, graphical web browser developed by the Mozilla 
    Corporation and hundreds of volunteers.