Multiple occurrences of CSS background scaling can cause moiré patterns to appear on mobile devices

I am experiencing an issue with a background image on my website. The image is a 2x2px png with transparency, repeated to create a pattern. The background looks fine on large screens and phones but appears distorted on my Nexus7 tablet, showing a moiré effect. It seems that the image is being scaled somehow, but I cannot figure out why.

This is my CSS: 

background: url(pattern.png) repeat top left;

I have also attempted: 

background: url(pattern.png) repeat 2px;

I have set the viewport as follows: 

<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">

I noticed another website experiencing similar issues on my tablet:

cssbackgroundrepeat

Answer №1

While this question may be dated, it could still be helpful to someone searching for answers. Today's screens often boast a high pixel density, resulting in pictures being interpolated to larger sizes for a crisper, retina-like display. The specific pattern I employed ended up getting divided into sub-pixels, which caused the Moiré effect to appear. Hopefully, this explanation proves useful to others.

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