Bootstrap 4.x doesn't give you white buttons by default, but sometimes white buttons look better, particularly for something like a search box using an input group with button addon placed on a navbar.
yairEO's Tagify is a great implementation of a tag component, being very lightweight and using in-built browser behaviour where possible. Here's how I get get suggestions via AJAX rather than a fixed whitelist.
While looking for a new car to buy – without much success – I looked further afield than the usual carsales.com.au and gumtree.com.au and found myself at tradingpost.com.au. Oh how they have gone down hill...
The Facebook app on Windows phone has a nice and unobtrusive back to top button that only appears once you scroll past a certain point, and only when you start scrolling up the page. This code offers similar functionality using jQuery.
There are a few methods for hiding and showing Bootstrap 3.x and 4.x modals in an ASP.NET Web Forms application. This technique is pure ASP.NET (requires no client script) and allows you to show and hide modals by changing the Visible property of a containing PlaceHolder or Panel.