HTML CSS Change Paragraph Spacing

I do some google to change my website design to change paragraph spacing and come across to this page. Its show the link that related to it

The site is http://answers.google.com/answers/threadview/id/783141.html

While the reference website is

• http://lab.artlung.com/change-space-between-paragraphs/
• http://www.w3schools.com/css/css_margin.asp
• http://www.westciv.com/style_master/academy/css_tutorial/properties/margin.html

All the link given is suggesting you to using css margin.
As for me, by using this already enough

<p style="line-height: 200px;">Hello World</p>