Image Zoom with plain JavaScript and CSS

Note: I’ve moved away from the solution outlined in this post. Mainly because I did not want to write an entire gallery from scratch. I’ve since opted to use lightgallery.js which is a pure JS image gallery solution with some nice goodies. The premise is simple. A post may contain images. These images are restricted in rendered size to keep the flow of the page in tact. Clicking an image allows you to zoom in.