OpenWebGIS is a new free GIS. You can use the extensive mathematical functionality to calculate and analyze your data. Using OpenWebGIS you will get online a Geographic Information System at your disposal, it may be similar in functionality to some desktop GIS. Please support this project
Within Start_OpenWebGIS_*.html their appears to be a number of elements with hardcoded styles, these should be added to the main.css file (noted in #3 and fixed in pull #4)
The CSS within the Start_OpenWebGIS_en.html / Start_OpenWebGIS_ru.html files is the same and maintainability of the project would be increased by splitting the CSS into its own file.
There are a number of accessibility issues with the page(s) including missing alt tags and colour contrast issues.
While, by their nature, maps fail accessibility checks in relation to inaccessible to most screen readers their are steps which can be taken to improve the site.
The site should aim to pass as many of the wave accessibility tests as it can (see http://wave.webaim.org/ )