PBR.ONE
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Interactive preview for PBR materials and HDRI environments in the browser. Originally built for ambientCG.com, now open source.
All previews would profit from having a fullscreen mode. This could be implemented as a button that appears in the corner if the element is in an iframe (if it...
The current version of the texture tiling preview only works with a mouse, not on touchscreens. More/different event listeners are probably needed to make this work.
The logo and some text at the bottom cause the website to scroll horizontally on smartphones. 
The material preview currently has a very high default clipping distance which can make it difficult to get close to the surface - something that people might want to do...