摘要：AbstractAbility to create web page is one of basic IT skills. In the web page creation learning process is student's final project often evaluated on code validity and code cleanness. There is also one problem that cannot be easily handled – recognizing modified projects. Concept of HTML and CSS allows to separate visual form from content. One project can be easily transformed into new visual form in a few steps. This paper is focused on solving this problem by computer automation. The basic idea is that inner structure of web page will be the same or very similar. Web page (HTML document) can be represented as a tree, where nodes are HTML elements. Paper describes basic ways how can be html tree structure compared with another html tree structure automatically by using tree algorithms. Result of this comparison is html structure tree similarity. Paper covers description of algorithms, implementation and testing.
