Using data- attributes for indexation, and a dynamic stylesheet with a CSS3 selector for search, it is straightforward to implement a client-side full-text search in CSS rather than JavaScript. Here is an example.
The search is very straightforward: it relies on two well-supported CSS3 selectors (:not() and [attr*=]) and the rewriting of a style rule each time the search input is modified:
The advantage of using CSS selectors rather than JavaScript indexOf() for search is speed: you only change one element at each keystroke (the <style> tag) instead of changing all the elements matching the query. Using the :not() selector, this implementation works on IE9+, but it could easily be made compatible with IE8+ by using two rules instead of one.