50% grey test

HTML

<center>On a correctly calibrated sRGB monitor, if viewed from a distance, the central hatched rectangle<br>should appear to be of equal colour and brightness to the surrounding field.</center><div />

CSS

body{background:#bbb}div{position:absolute;left:25%;top:25%;width:50%;height:50%;background:url(data:image/bmp;base64,Qk0iAAAAAAAAABoAAAAMAAAAAQACAAEAGABMTEwA9vb2AA==)}

JavaScript

document.body.onload=_=>document.body.children[1].style.backgroundSize=1/devicePixelRatio+"px"

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50% grey test

HTML

CSS

JavaScript

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Join the 4+ million users, and keep the JSFiddle dream alive.

Ad-free

Use pre-released features

Fiddle collections

Private collections and fiddles

Console