A front-end developer toolkit
Because I think that the best css/js toolkit is composed by many agnostic micro libraries.
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Sass MQ
A Sass mixin that helps you compose media queries in an elegant way.
My favourite to make perfectly customized media queries
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LazySizes
High performance and SEO friendly lazy loader for images (responsive and normal), iframes and more, that detects any visibility changes triggered through user interaction, CSS or JavaScript without configuration.
Amazingly powerfull
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Flickity
Touch, responsive, flickable carousels
Not perfect, but better than buggy owl carousel
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Toggles Switches
A declarative pattern for applying CSS states and animations based on user interaction
For things like responsive nav
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Impetus
Agnostic utility for adding momentum to anything. It's like iScroll, except not for scrolling. Supports mouse and touch events.
Simple but very limited (no callbacks)
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PhotoSwipe
JavaScript image gallery for mobile and desktop.
https://github.com/dimsemenov/PhotoSwipe
Untested
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Sass burger
A Sass mixin for creating hamburger icons.
https://github.com/jorenvanhee/sass-burger -
Flow.js
A JavaScript library providing multiple simultaneous, stable, fault-tolerant and resumable/restartable file uploads via the HTML5 File API.
https://github.com/flowjs/flow.js -
Dragdealer
Drag-based JavaScript component, embracing endless UI solutions
Untested but very promising
jQuery dependency
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Zoom.js
Medium's Image Zoom for jQuery
https://github.com/fat/zoom.js