The logical continuation of the already conducted research of CSS / DOM-performance of browsers ( part 1 , part 2 , part 3 ) was to consider the dependence of the time to create a document on the number of tags (tree nodes). Cases were analyzed separately when the DOM tree was purely linear (all div lay directly inside the body , when it was branched (branches of 10 nested div built up inside the body ) and when some semantic structure was used instead of a branch from the div .