PUBLIC MARKS from decembre with tags position & customize

https://github.com/filamentgroup/fixed-sticky ====== CSS position:sticky is really in its infancy in terms of browser support. In stock browsers, it is currently only available in iOS 6. In Chrome you can enable it by navigating to chrome://flags and enabling experimental “WebKit features” or “Web Platform features” (Canary). In Firefox you you can go to about:config and set layout.css.sticky.enabled to "true".