Thanks to the proper use of heading tags (e.g. <h1>, <h2>) and basing the implementation on Cascading Style Sheets, we improve the proportion between the content of your website and the code needed to create it. Using the proper HTML code and code and proportionally more content on the website means:
JIGSAW CMS division into three layers (logic, content, presentation) provides the consumer with freedom to make changes in one of these three layers with neither need of changing nor risk of getting the side effects in the other layers.