blank line to separate paragraph it dose not work

[simrb]

my code

require 'kramdown'
str = "this is first line \n\r this is third line"
Kramdown::Document.new(str).to_html

that outputs the below

<p>this is first line 
 this is third line</p>

obviously, that is not what i want to be , i want the \n or \r to be the <br/>,
so, would i miss something ?

[gettalong]

Line breaks in Markdown/kramdown are not treated as hard line breaks but as line continuations. If you need to separate two paragraphs, use a blank line.

If you want to insert a <br /> tag, use two spaces at the end of a line. See http://kramdown.gettalong.org/syntax.html for more information.

[simrb]

Thanks, @gettalong

I were aware of that document before i ask question,
but it is awkward to this situation of what i edit is not what i see.
I am very hope to add this feature.

[gettalong]

I don't understand your problem. The example you have given is the following:

this is first line
 this is third line

So there is clearly no blank line between the two lines. You need to enter the following:

this is first line

 this is third line

There is now a blank line between the two lines and therefore this will produce two separate paragraphs.

If you want to have line breaks (<br />), you need to use two spaces or two backslashes at the end of a line:

this is a  
test for line breaks\\ 
in a paragraph

will produce

<p>this is a<br />
test for line breaks<br />
in a paragraph</p>

[simrb]

Ok, the problem i solved it , i forget setting the css of paragraph to make it looks like having a blank line with p { padding-bottom: 5px;} instead of inserting a blank line in editor as separator.