2017
CSS - RESPONSIVE - MEDIA QUERIES - The math of CSSĀ locks
A CSS lock is a Responsive Web Design technique that lets you transition smoothly between two values, depending on the current viewport size, rather than jump straight from one value to the other.
2015
DEV - Responsive Images 101, Part 5: Sizes Cloud Four Blog
the browser only knows the size of the viewport when it begins downloading images.
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(2 marks)