The test for 'Responsive Web Design Principles: Use a Retina Image for Higher Resolution' won't pass on Google Chrome. It will pass with Safari, and it will pass with Firefox. There are matching reports on the FCC Help Forum.
<style>
img { width: 100px; height: 100px;}
</style>
<img src="https://s3.amazonaws.com/freecodecamp/FCCStickers-CamperBot200x200.jpg" alt="freeCodeCamp sticker that says 'Because CamperBot Cares'">
The above passed with Safari (Version 11.1 (13605.1.33.1.4)), but not Chrome (67.0.3396.79 (Official Build) (64-bit)).
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@Dave-Melia are you still having this problem? I just tested and it worked for me on chrome - if it seems to be working for you now you could probly close this.
I don't know how to fix this problem, but for some reason chrome computed style width is little less than specified and firefox computes to exact 100px. And the test case checks for exactly 100px, which is probably why it fails on chrome and passes in firefox, did that for me.
Code for both results:
img {
width: 100px;
height: 100px;
}
Chrome:
Firefox:
I am using the browser Google Chrome, Version 67.0.3396.99 (Official Build) (64-bit).
I can not pass the check. Here is my code

I just used the browser Firefox Version 61.0 (64-bit). I was able to submit the same code and pass the check, there is definitely a bug for the chrome browser
If you zoom out with the browser then the challenge doesn't work. Try having the browser at 100% zoom, that fixed the issue for me
Yuppers, zooming @ 100% rectify the issue.
Using Chrome stable ver. 69.0.xxxx
@Dave-Melia It seems fine now. Please close this issue
Thanks for reporting this issue, but it seems to be fixed. If you think it's still a problem you can reopen it.
Thanks, and happy coding!
This issue was still occurring for me. Changing to 90% zoom in Chrome fixed the issue.
Most helpful comment
If you zoom out with the browser then the challenge doesn't work. Try having the browser at 100% zoom, that fixed the issue for me