Flexible Floating Panels With Portamento.js
Using elements that stay in the viewport while scrolling is a good way of providing an easy-to-reach links/info (like navigation or help) to users
Portamento.js is a jQuery plugin for creating such floating panels quickly with a line of JavaScript and few CSS rules.
It functions well with both absolutely-positioned + floated layouts and has cross-browser support.
The plugin has a smart feature which understands whether the screen-size is big enough or not to display the floating panel and decides to float it (or not) automatically.
It is very easy to use and has very few configuration options like "the element to be wrapped" or "its margin from top".
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