LESS - Import Options

In this chapter let's study about Import Options. LESS offers @import that allow style sheets to import both LESS and CSS style sheets.
The following tables lists the import directives that will be implemented in import statements.

S.N.	Import options & Description
1	reference It uses a LESS file only as reference and will not output it.
2	inline It enables you to copy your CSS into the output without being processed.
3	less It will treat the imported file as regular LESS file, despite whatever may be the file extension.
4	css It will treat the imported file as regular CSS file, despite whatever may be the file extension.
5	once It will imports the file only one time.
6	multiple It will imports the file multiple times.
7	optional It continue compiling even though the file to import is not found.

More than one keyword is allowed to use in @import statement, however you have to use commas to seperate the keywords.
For instance:

@import (less, optional) "custom.css";